<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://ucbi.com/role/AccountingPolicies" xlink:href="ucbi-20190331.xsd#AccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AccountingPoliciesPolicies" xlink:href="ucbi-20190331.xsd#AccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AccountingStandardsUpdatesAndRecentlyAdoptedStandards" xlink:href="ucbi-20190331.xsd#AccountingStandardsUpdatesAndRecentlyAdoptedStandards" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AccountingStandardsUpdatesAndRecentlyAdoptedStandardsNarrativeDetails" xlink:href="ucbi-20190331.xsd#AccountingStandardsUpdatesAndRecentlyAdoptedStandardsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValue" xlink:href="ucbi-20190331.xsd#AssetsAndLiabilitiesMeasuredAtFairValue" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueAssetsAndLiabilitiesMeasuredAtFairValueOnNonrecurringBasisDetails" xlink:href="ucbi-20190331.xsd#AssetsAndLiabilitiesMeasuredAtFairValueAssetsAndLiabilitiesMeasuredAtFairValueOnNonrecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="ucbi-20190331.xsd#AssetsAndLiabilitiesMeasuredAtFairValueAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueFairValuesForOtherFinancialInstrumentsThatAreNotMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="ucbi-20190331.xsd#AssetsAndLiabilitiesMeasuredAtFairValueFairValuesForOtherFinancialInstrumentsThatAreNotMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueNarrativeDetails" xlink:href="ucbi-20190331.xsd#AssetsAndLiabilitiesMeasuredAtFairValueNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueQuantitativeInformationAboutLevel3FairValueMeasurementsForFairValueOnRecurringBasisDetails" xlink:href="ucbi-20190331.xsd#AssetsAndLiabilitiesMeasuredAtFairValueQuantitativeInformationAboutLevel3FairValueMeasurementsForFairValueOnRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueReconciliationForMeasurementsAtFairValueOnRecurringBasisUsingSignificantUnobservableInputsDetails" xlink:href="ucbi-20190331.xsd#AssetsAndLiabilitiesMeasuredAtFairValueReconciliationForMeasurementsAtFairValueOnRecurringBasisUsingSignificantUnobservableInputsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueTables" xlink:href="ucbi-20190331.xsd#AssetsAndLiabilitiesMeasuredAtFairValueTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowings" xlink:href="ucbi-20190331.xsd#BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowings" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsNarrativeDetails" xlink:href="ucbi-20190331.xsd#BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsRepurchaseAgreementsAccountedForAsSecuredBorrowingsDetails" xlink:href="ucbi-20190331.xsd#BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsRepurchaseAgreementsAccountedForAsSecuredBorrowingsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsSummaryOfAmountsOutstandingUnderMasterNettingAgreementsDetails" xlink:href="ucbi-20190331.xsd#BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsSummaryOfAmountsOutstandingUnderMasterNettingAgreementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsTables" xlink:href="ucbi-20190331.xsd#BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/CommitmentsAndContingencies" xlink:href="ucbi-20190331.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/CommitmentsAndContingenciesContractualAmountOfOffBalanceSheetInstrumentsDetails" xlink:href="ucbi-20190331.xsd#CommitmentsAndContingenciesContractualAmountOfOffBalanceSheetInstrumentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:href="ucbi-20190331.xsd#CommitmentsAndContingenciesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/CommitmentsAndContingenciesTables" xlink:href="ucbi-20190331.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/CommonStock" xlink:href="ucbi-20190331.xsd#CommonStock" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/CommonStockDetails" xlink:href="ucbi-20190331.xsd#CommonStockDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:href="ucbi-20190331.xsd#ConsolidatedBalanceSheetsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedBalanceSheetsUnauditedParentheticals" xlink:href="ucbi-20190331.xsd#ConsolidatedBalanceSheetsUnauditedParentheticals" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementOfChangesInShareholdersEquityUnaudited" xlink:href="ucbi-20190331.xsd#ConsolidatedStatementOfChangesInShareholdersEquityUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementOfChangesInShareholdersEquityUnauditedParentheticals" xlink:href="ucbi-20190331.xsd#ConsolidatedStatementOfChangesInShareholdersEquityUnauditedParentheticals" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsOfCashFlowsUnaudited" xlink:href="ucbi-20190331.xsd#ConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:href="ucbi-20190331.xsd#ConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnauditedCalc2" xlink:href="ucbi-20190331.xsd#ConsolidatedStatementsOfComprehensiveIncomeUnauditedCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsOfIncomeUnaudited" xlink:href="ucbi-20190331.xsd#ConsolidatedStatementsOfIncomeUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ConsolidatedStatementsOfIncomeUnauditedParentheticals" xlink:href="ucbi-20190331.xsd#ConsolidatedStatementsOfIncomeUnauditedParentheticals" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesAndHedgingActivities" xlink:href="ucbi-20190331.xsd#DerivativesAndHedgingActivities" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesAndHedgingActivitiesDerivativesDesignatedAsHedgingInstrumentsUnderAsc815Details" xlink:href="ucbi-20190331.xsd#DerivativesAndHedgingActivitiesDerivativesDesignatedAsHedgingInstrumentsUnderAsc815Details" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesAndHedgingActivitiesDerivativesInFairValueHedgingRelationshipsDetails" xlink:href="ucbi-20190331.xsd#DerivativesAndHedgingActivitiesDerivativesInFairValueHedgingRelationshipsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesAndHedgingActivitiesDerivativesNotDesignatedAsHedgingInstrumentsUnderAsc815Details" xlink:href="ucbi-20190331.xsd#DerivativesAndHedgingActivitiesDerivativesNotDesignatedAsHedgingInstrumentsUnderAsc815Details" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesAndHedgingActivitiesGainsAndLossesRecognizedInIncomeOnDerivativesNotDesignatedAsHedgingInstrumentDetails" xlink:href="ucbi-20190331.xsd#DerivativesAndHedgingActivitiesGainsAndLossesRecognizedInIncomeOnDerivativesNotDesignatedAsHedgingInstrumentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesAndHedgingActivitiesNarrativeDetails" xlink:href="ucbi-20190331.xsd#DerivativesAndHedgingActivitiesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/DerivativesAndHedgingActivitiesTables" xlink:href="ucbi-20190331.xsd#DerivativesAndHedgingActivitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/DocumentAndEntityInformation" xlink:href="ucbi-20190331.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShare" xlink:href="ucbi-20190331.xsd#EarningsPerShare" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails" xlink:href="ucbi-20190331.xsd#EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShareNarrativeDetails" xlink:href="ucbi-20190331.xsd#EarningsPerShareNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/EarningsPerShareTables" xlink:href="ucbi-20190331.xsd#EarningsPerShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/IncomeTaxes" xlink:href="ucbi-20190331.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/IncomeTaxesNarrativeDetails" xlink:href="ucbi-20190331.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLosses" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLosses" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesAgingOfRecordedInvestmentInPastDueLoansDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesAgingOfRecordedInvestmentInPastDueLoansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesAverageBalancesOfImpairedLoansAndIncomeRecognizedOnImpairedLoansDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesAverageBalancesOfImpairedLoansAndIncomeRecognizedOnImpairedLoansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesBalanceAndActivityInAllowanceForLoanLossesByPortfolioSegmentAndRecordedInvestmentInLoansByPortfolioSegmentDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesBalanceAndActivityInAllowanceForLoanLossesByPortfolioSegmentAndRecordedInvestmentInLoansByPortfolioSegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesChangesInValueOfAccretableYieldForAcquiredLoansDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesChangesInValueOfAccretableYieldForAcquiredLoansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesComponentsOfNetInvestmentInLeasesDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesComponentsOfNetInvestmentInLeasesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesLoansIndividuallyEvaluatedForImpairmentByClassOfLoansDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesLoansIndividuallyEvaluatedForImpairmentByClassOfLoansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesLoansModifiedUnderTermsOfTdrDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesLoansModifiedUnderTermsOfTdrDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesMajorClassificationsOfLoansDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesMajorClassificationsOfLoansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesMinimumFutureLeasePaymentToBeReceivedDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesMinimumFutureLeasePaymentToBeReceivedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesNarrativeDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesRecordedInvestmentInLoansByPortfolioSegmentAndBalanceOfAllowanceForLoanLossesDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesRecordedInvestmentInLoansByPortfolioSegmentAndBalanceOfAllowanceForLoanLossesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesRecordedInvestmentInNonaccrualLoansByLoanClassDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesRecordedInvestmentInNonaccrualLoansByLoanClassDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesRiskCategoryOfLoansByClassOfLoansDetails" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesRiskCategoryOfLoansByClassOfLoansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesTables" xlink:href="ucbi-20190331.xsd#LoansAndLeasesAndAllowanceForCreditLossesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeases" xlink:href="ucbi-20190331.xsd#OperatingLeases" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesFutureMinimumLeasePaymentsDetails" xlink:href="ucbi-20190331.xsd#OperatingLeasesFutureMinimumLeasePaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesFutureMinimumLeasePaymentsDetailsCalc2" xlink:href="ucbi-20190331.xsd#OperatingLeasesFutureMinimumLeasePaymentsDetailsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesNarrativeDetails" xlink:href="ucbi-20190331.xsd#OperatingLeasesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesOperatingLeaseIncomeAndExpenseAndOtherSupplementalInformationDetails" xlink:href="ucbi-20190331.xsd#OperatingLeasesOperatingLeaseIncomeAndExpenseAndOtherSupplementalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/OperatingLeasesTables" xlink:href="ucbi-20190331.xsd#OperatingLeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ReclassificationsOutOfAccumulatedOtherComprehensiveIncome" xlink:href="ucbi-20190331.xsd#ReclassificationsOutOfAccumulatedOtherComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeDetails" xlink:href="ucbi-20190331.xsd#ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeTables" xlink:href="ucbi-20190331.xsd#ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/Securities" xlink:href="ucbi-20190331.xsd#Securities" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesAmortizedCostAndFairValueOfHeldToMaturityAndAvailableForSaleSecuritiesByContractualMaturityDetails" xlink:href="ucbi-20190331.xsd#SecuritiesAmortizedCostAndFairValueOfHeldToMaturityAndAvailableForSaleSecuritiesByContractualMaturityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesAmortizedCostGrossUnrealizedGainsAndLossesAndFairValueOfDebtSecuritiesAvailableForSaleDetails" xlink:href="ucbi-20190331.xsd#SecuritiesAmortizedCostGrossUnrealizedGainsAndLossesAndFairValueOfDebtSecuritiesAvailableForSaleDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesAmortizedCostGrossUnrealizedGainsAndLossesAndFairValueOfDebtSecuritiesHeldToMaturityDetails" xlink:href="ucbi-20190331.xsd#SecuritiesAmortizedCostGrossUnrealizedGainsAndLossesAndFairValueOfDebtSecuritiesHeldToMaturityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesNarrativeDetails" xlink:href="ucbi-20190331.xsd#SecuritiesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesSummaryOfAvailableForSaleSecuritiesSalesActivityDetails" xlink:href="ucbi-20190331.xsd#SecuritiesSummaryOfAvailableForSaleSecuritiesSalesActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesSummaryOfDebtSecuritesHeldToMaturityInUnrealizedLossPositionDetails" xlink:href="ucbi-20190331.xsd#SecuritiesSummaryOfDebtSecuritesHeldToMaturityInUnrealizedLossPositionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesSummaryOfDebtSecuritiesAvailableForSaleInUnrealizedLossPositionDetails" xlink:href="ucbi-20190331.xsd#SecuritiesSummaryOfDebtSecuritiesAvailableForSaleInUnrealizedLossPositionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SecuritiesTables" xlink:href="ucbi-20190331.xsd#SecuritiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensation" xlink:href="ucbi-20190331.xsd#StockBasedCompensation" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensationNarrativeDetails" xlink:href="ucbi-20190331.xsd#StockBasedCompensationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensationRestrictedStockUnitActivityDetails" xlink:href="ucbi-20190331.xsd#StockBasedCompensationRestrictedStockUnitActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensationStockOptionActivityDetails" xlink:href="ucbi-20190331.xsd#StockBasedCompensationStockOptionActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/StockBasedCompensationTables" xlink:href="ucbi-20190331.xsd#StockBasedCompensationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SubsequentEvents" xlink:href="ucbi-20190331.xsd#SubsequentEvents" xlink:type="simple" />
  <link:roleRef roleURI="http://ucbi.com/role/SubsequentEventsNarrativeDetails" xlink:href="ucbi-20190331.xsd#SubsequentEventsNarrativeDetails" xlink:type="simple" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingPoliciesPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingStandardsUpdatesAndRecentlyAdoptedStandards" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AccountingStandardsUpdatesAndRecentlyAdoptedStandardsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValue" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueAssetsAndLiabilitiesMeasuredAtFairValueOnNonrecurringBasisDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_61bb41c2-5e2c-2804-d184-f566af2acbb1" xlink:type="locator" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DeferredCompensationPlanLiability" xlink:label="loc_ucbi_DeferredCompensationPlanLiability_DAC03D5F559F45FC0239A9305A0BAECA" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_61bb41c2-5e2c-2804-d184-f566af2acbb1" xlink:to="loc_ucbi_DeferredCompensationPlanLiability_DAC03D5F559F45FC0239A9305A0BAECA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_a3ccd28b-d904-f2d6-d218-02006f748e50" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_61bb41c2-5e2c-2804-d184-f566af2acbb1" xlink:to="loc_us-gaap_DerivativeLiabilities_a3ccd28b-d904-f2d6-d218-02006f748e50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MortgagesHeldForSaleFairValueDisclosure" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_00fff42f-ba49-6993-723e-7c4718f98e2e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_00fff42f-ba49-6993-723e-7c4718f98e2e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredCompensationPlanAssets" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_c5e8e545-d184-736b-7221-b1f3df7f1e36" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_c5e8e545-d184-736b-7221-b1f3df7f1e36" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ServicingAssetAtFairValueAmount" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_49308692-13dc-a34d-50c9-c91ed079ff76" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_49308692-13dc-a34d-50c9-c91ed079ff76" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_ResidentialMortgageServicingAssetatFairValueAmount" xlink:label="loc_ucbi_ResidentialMortgageServicingAssetatFairValueAmount_71D3188B5FF8F314E646A92E8C48A1BC" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_ucbi_ResidentialMortgageServicingAssetatFairValueAmount_71D3188B5FF8F314E646A92E8C48A1BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_990d24f7-bf09-089d-4b5d-4490e079db44" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_DerivativeAssets_990d24f7-bf09-089d-4b5d-4490e079db44" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueFairValuesForOtherFinancialInstrumentsThatAreNotMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueQuantitativeInformationAboutLevel3FairValueMeasurementsForFairValueOnRecurringBasisDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueReconciliationForMeasurementsAtFairValueOnRecurringBasisUsingSignificantUnobservableInputsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/AssetsAndLiabilitiesMeasuredAtFairValueTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowings" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsRepurchaseAgreementsAccountedForAsSecuredBorrowingsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsSummaryOfAmountsOutstandingUnderMasterNettingAgreementsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_078C2523957A55B09274162C459FAA9E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_2F0FB17FEDAA5EFCA7FB3C3C0972CDA3" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_078C2523957A55B09274162C459FAA9E" xlink:to="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_2F0FB17FEDAA5EFCA7FB3C3C0972CDA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability_C561AA83601C5CBDB2CF1D4032137467" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_078C2523957A55B09274162C459FAA9E" xlink:to="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability_C561AA83601C5CBDB2CF1D4032137467" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1EC7A4C5CE1C5686BA42769CE3032F05" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned_C6B449CCD79E5420AB24FEC2804423C8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1EC7A4C5CE1C5686BA42769CE3032F05" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned_C6B449CCD79E5420AB24FEC2804423C8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_49266DD45A4857E8A2A1395E325BB357" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned_C6B449CCD79E5420AB24FEC2804423C8" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_49266DD45A4857E8A2A1395E325BB357" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset_E0397DC51B3A5824AE52481965299840" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned_C6B449CCD79E5420AB24FEC2804423C8" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset_E0397DC51B3A5824AE52481965299840" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotOffsetPolicyElectionDeduction" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotOffsetPolicyElectionDeduction_4175322C01F45AA69166BCD99BE98814" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1EC7A4C5CE1C5686BA42769CE3032F05" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotOffsetPolicyElectionDeduction_4175322C01F45AA69166BCD99BE98814" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral_72A6BE61E39F56419D0343342D91717A" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1EC7A4C5CE1C5686BA42769CE3032F05" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral_72A6BE61E39F56419D0343342D91717A" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_7156C6576E175A4C8A36A9418CA13E59" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_F992941F9D12540AB57A94403348097D" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_7156C6576E175A4C8A36A9418CA13E59" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_F992941F9D12540AB57A94403348097D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_B057E1A5F19154809D05E45EE137C97D" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_F992941F9D12540AB57A94403348097D" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_B057E1A5F19154809D05E45EE137C97D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_93202233E96956B8B3C39E1CE06D8418" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_F992941F9D12540AB57A94403348097D" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_93202233E96956B8B3C39E1CE06D8418" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_F7DA26C3267C5FF3952D9A3734E4EC3C" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_7156C6576E175A4C8A36A9418CA13E59" xlink:to="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_F7DA26C3267C5FF3952D9A3734E4EC3C" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_038EFD687A4552CC8D4E602A5E9B2660" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_7156C6576E175A4C8A36A9418CA13E59" xlink:to="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_038EFD687A4552CC8D4E602A5E9B2660" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_87A7C40BC31E50F8A78D15B9A7DF2727" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_506ECADE244057E0A01BF0FB83FD0B6B" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_87A7C40BC31E50F8A78D15B9A7DF2727" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_506ECADE244057E0A01BF0FB83FD0B6B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_FCCC57E6F03F5388867D55D1F7DC4715" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_506ECADE244057E0A01BF0FB83FD0B6B" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_FCCC57E6F03F5388867D55D1F7DC4715" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_37F9BF110D6A532A971DC391746811A9" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_506ECADE244057E0A01BF0FB83FD0B6B" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_37F9BF110D6A532A971DC391746811A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction" xlink:label="loc_us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction_D18DA1827B47553595FA4E98B5EB5F57" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_87A7C40BC31E50F8A78D15B9A7DF2727" xlink:to="loc_us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction_D18DA1827B47553595FA4E98B5EB5F57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetFairValueOfCollateral" xlink:label="loc_us-gaap_DerivativeAssetFairValueOfCollateral_2974A23F5D9C5B4D89B8E190690A8FFD" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_87A7C40BC31E50F8A78D15B9A7DF2727" xlink:to="loc_us-gaap_DerivativeAssetFairValueOfCollateral_2974A23F5D9C5B4D89B8E190690A8FFD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_090AEBA2D8FB5D0193733A0B5669B627" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_0F15B95782B15315915B2F6C7489C557" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_090AEBA2D8FB5D0193733A0B5669B627" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_0F15B95782B15315915B2F6C7489C557" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_BEE0D45E99655927B6B3779F6570B1FE" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_0F15B95782B15315915B2F6C7489C557" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_BEE0D45E99655927B6B3779F6570B1FE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_68452FA1876959018A7083E9B8424940" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_0F15B95782B15315915B2F6C7489C557" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_68452FA1876959018A7083E9B8424940" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction" xlink:label="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_A79029216DC850948FA28E081A7459C5" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_090AEBA2D8FB5D0193733A0B5669B627" xlink:to="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_A79029216DC850948FA28E081A7459C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOfCollateral" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_458029D995895F1A95C9C05E1D829A8A" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_090AEBA2D8FB5D0193733A0B5669B627" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_458029D995895F1A95C9C05E1D829A8A" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_1D9DC40D7FE850D0BE2B55F112B010F9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResell" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_0C97869EE67054FA8EDC2F279E9AD20E" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_1D9DC40D7FE850D0BE2B55F112B010F9" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_0C97869EE67054FA8EDC2F279E9AD20E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_FB9FDF4F308D5968B2CA9BE1BF8FA2E1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_0C97869EE67054FA8EDC2F279E9AD20E" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_FB9FDF4F308D5968B2CA9BE1BF8FA2E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_52A712386A0051468BFD2796C51123EC" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_0C97869EE67054FA8EDC2F279E9AD20E" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_52A712386A0051468BFD2796C51123EC" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_160A4A5938C857E1B5EEEA720FD5A591" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_1D9DC40D7FE850D0BE2B55F112B010F9" xlink:to="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_160A4A5938C857E1B5EEEA720FD5A591" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_28344C0746BA5ABABDC63BEA980665DA" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_1D9DC40D7FE850D0BE2B55F112B010F9" xlink:to="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_28344C0746BA5ABABDC63BEA980665DA" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/BalanceSheetOffsettingAndRepurchaseAgreementsAccountedForAsSecuredBorrowingsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/CommitmentsAndContingenciesContractualAmountOfOffBalanceSheetInstrumentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/CommonStock" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/CommonStockDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashCashEquivalentsAndFederalFundsSold" xlink:label="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_4a5e2607-4ba0-5cff-acd9-0dbf896894d7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_4a5e2607-4ba0-5cff-acd9-0dbf896894d7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndDueFromBanks" xlink:label="loc_us-gaap_CashAndDueFromBanks_6ea59cdf-420f-0221-a162-87e84408dc3b" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_4a5e2607-4ba0-5cff-acd9-0dbf896894d7" xlink:to="loc_us-gaap_CashAndDueFromBanks_6ea59cdf-420f-0221-a162-87e84408dc3b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestBearingDepositsInBanks" xlink:label="loc_us-gaap_InterestBearingDepositsInBanks_75c23f4c-57d7-1642-0f06-8805879e7b8d" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsAndFederalFundsSold_4a5e2607-4ba0-5cff-acd9-0dbf896894d7" xlink:to="loc_us-gaap_InterestBearingDepositsInBanks_75c23f4c-57d7-1642-0f06-8805879e7b8d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecurities" xlink:label="loc_us-gaap_HeldToMaturitySecurities_3bb8bc81-af51-9945-0a22-cc4527e07a17" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_HeldToMaturitySecurities_3bb8bc81-af51-9945-0a22-cc4527e07a17" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup" xlink:label="loc_us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup_42786bb9-6e3c-6b98-ae1f-cfea111c0df9" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup_42786bb9-6e3c-6b98-ae1f-cfea111c0df9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetReportedAmount" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_8aea15c4-5727-d9d4-717f-630ed8fbfd83" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_8aea15c4-5727-d9d4-717f-630ed8fbfd83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_8aea15c4-5727-d9d4-717f-630ed8fbfd83" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansAndLeasesReceivableAllowance" xlink:label="loc_us-gaap_LoansAndLeasesReceivableAllowance_8e1c2ae9-243e-baf4-cc90-3e520d158505" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmount_8aea15c4-5727-d9d4-717f-630ed8fbfd83" xlink:to="loc_us-gaap_LoansAndLeasesReceivableAllowance_8e1c2ae9-243e-baf4-cc90-3e520d158505" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BankOwnedLifeInsurance" xlink:label="loc_us-gaap_BankOwnedLifeInsurance_018f383f-2509-5672-bb2d-340e9af33c38" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_BankOwnedLifeInsurance_018f383f-2509-5672-bb2d-340e9af33c38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccruedInvestmentIncomeReceivable" xlink:label="loc_us-gaap_AccruedInvestmentIncomeReceivable_1d6b0581-e24d-9a5d-0503-a30115a080d6" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_AccruedInvestmentIncomeReceivable_1d6b0581-e24d-9a5d-0503-a30115a080d6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_0c301281-b140-dfcb-9991-ae503484f9da" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_0c301281-b140-dfcb-9991-ae503484f9da" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_990d24f7-bf09-089d-4b5d-4490e079db44" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_DerivativeAssets_990d24f7-bf09-089d-4b5d-4490e079db44" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_c04dd71c-529e-62f9-136d-a0a478e6fbc1" xlink:type="locator" />
    <link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_c04dd71c-529e-62f9-136d-a0a478e6fbc1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherAssets" xlink:label="loc_us-gaap_OtherAssets_cb56b01f-b9c5-ca9e-8988-e23b27fc7a20" xlink:type="locator" />
    <link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_OtherAssets_cb56b01f-b9c5-ca9e-8988-e23b27fc7a20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Deposits" xlink:label="loc_us-gaap_Deposits_20926415-8452-ba54-f959-6378e08cdab1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:to="loc_us-gaap_Deposits_20926415-8452-ba54-f959-6378e08cdab1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DemandDepositAccounts" xlink:label="loc_us-gaap_DemandDepositAccounts_46e5ac8d-f1cd-eb14-2db6-553f0591d39f" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_20926415-8452-ba54-f959-6378e08cdab1" xlink:to="loc_us-gaap_DemandDepositAccounts_46e5ac8d-f1cd-eb14-2db6-553f0591d39f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepositsNegotiableOrderOfWithdrawalNOW" xlink:label="loc_us-gaap_DepositsNegotiableOrderOfWithdrawalNOW_c8ca63c0-979a-e0b4-f88c-2073d9d75746" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_20926415-8452-ba54-f959-6378e08cdab1" xlink:to="loc_us-gaap_DepositsNegotiableOrderOfWithdrawalNOW_c8ca63c0-979a-e0b4-f88c-2073d9d75746" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepositsMoneyMarketDeposits" xlink:label="loc_us-gaap_DepositsMoneyMarketDeposits_b8da1a0d-5473-9596-e9cc-b0f0c02b0bdd" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_20926415-8452-ba54-f959-6378e08cdab1" xlink:to="loc_us-gaap_DepositsMoneyMarketDeposits_b8da1a0d-5473-9596-e9cc-b0f0c02b0bdd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepositsSavingsDeposits" xlink:label="loc_us-gaap_DepositsSavingsDeposits_e2eebd17-91a3-03ac-15d7-5acaadde63c6" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_20926415-8452-ba54-f959-6378e08cdab1" xlink:to="loc_us-gaap_DepositsSavingsDeposits_e2eebd17-91a3-03ac-15d7-5acaadde63c6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TimeDeposits" xlink:label="loc_us-gaap_TimeDeposits_dfb31fa0-410a-effc-39b9-3f990161d983" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_20926415-8452-ba54-f959-6378e08cdab1" xlink:to="loc_us-gaap_TimeDeposits_dfb31fa0-410a-effc-39b9-3f990161d983" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_Brokered" xlink:label="loc_ucbi_Brokered_d339a3d3-b14c-c82f-e1e6-b1db830ac84b" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Deposits_20926415-8452-ba54-f959-6378e08cdab1" xlink:to="loc_ucbi_Brokered_d339a3d3-b14c-c82f-e1e6-b1db830ac84b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdvancesFromFederalHomeLoanBanks" xlink:label="loc_us-gaap_AdvancesFromFederalHomeLoanBanks_7b05fc35-5f84-3c6c-c727-bb89aa8ceb66" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:to="loc_us-gaap_AdvancesFromFederalHomeLoanBanks_7b05fc35-5f84-3c6c-c727-bb89aa8ceb66" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_7e14882f-7ab9-8302-20ff-24c510ab8806" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:to="loc_us-gaap_LongTermDebt_7e14882f-7ab9-8302-20ff-24c510ab8806" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_a3ccd28b-d904-f2d6-d218-02006f748e50" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:to="loc_us-gaap_DerivativeLiabilities_a3ccd28b-d904-f2d6-d218-02006f748e50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilities" xlink:label="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_29766439-8b87-9812-7936-6bf8074f7891" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:to="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_29766439-8b87-9812-7936-6bf8074f7891" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_c3f7606a-e7e9-61d5-b60b-b4b059f68b26" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_CommonStockValue_c3f7606a-e7e9-61d5-b60b-b4b059f68b26" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_CommonStocksIssuable" xlink:label="loc_ucbi_CommonStocksIssuable_d9bcb360-9c81-6ab7-8bc6-b1db830aba2a" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_ucbi_CommonStocksIssuable_d9bcb360-9c81-6ab7-8bc6-b1db830aba2a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_2d1b9d27-8b19-82d9-2843-5b3d292b7fbb" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_AdditionalPaidInCapital_2d1b9d27-8b19-82d9-2843-5b3d292b7fbb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_065cb284-7fca-cc9b-5752-2feaf74d0011" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_065cb284-7fca-cc9b-5752-2feaf74d0011" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_04f0961a-a0bc-88cf-6658-3f950da4a458" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_04f0961a-a0bc-88cf-6658-3f950da4a458" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedBalanceSheetsUnauditedParentheticals" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementOfChangesInShareholdersEquityUnaudited" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementOfChangesInShareholdersEquityUnauditedParentheticals" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_9b039144-dc24-2381-1de5-20fa04e9b091" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_9b039144-dc24-2381-1de5-20fa04e9b091" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProvisionForLoanAndLeaseLosses" xlink:label="loc_us-gaap_ProvisionForLoanAndLeaseLosses_e0ca8321-ebf3-2764-9c0e-6cfd763aef57" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_ProvisionForLoanAndLeaseLosses_e0ca8321-ebf3-2764-9c0e-6cfd763aef57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f75d01b7-d271-b07d-c4a7-6ae60293303d" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f75d01b7-d271-b07d-c4a7-6ae60293303d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RealizedInvestmentGainsLosses" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_31e3dd28-476e-00f2-8880-e008f6d07eec" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_31e3dd28-476e-00f2-8880-e008f6d07eec" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_GainsFromSalesOfGovernmentGuaranteedLoans" xlink:label="loc_ucbi_GainsFromSalesOfGovernmentGuaranteedLoans_70d7d530-bf54-b9e1-3450-b1db830aeb70" xlink:type="locator" />
    <link:calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_ucbi_GainsFromSalesOfGovernmentGuaranteedLoans_70d7d530-bf54-b9e1-3450-b1db830aeb70" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainsLossesOnSalesOfOtherRealEstate" xlink:label="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_64e6ffc2-2e49-1f95-1346-70fd1dbe1fe6" xlink:type="locator" />
    <link:calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_64e6ffc2-2e49-1f95-1346-70fd1dbe1fe6" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_IncreaseDecreaseInOtherAssetsAndAccruedInterestReceivable" xlink:label="loc_ucbi_IncreaseDecreaseInOtherAssetsAndAccruedInterestReceivable_13cfa29e-c267-db8f-5b9f-fef928595ada" xlink:type="locator" />
    <link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_ucbi_IncreaseDecreaseInOtherAssetsAndAccruedInterestReceivable_13cfa29e-c267-db8f-5b9f-fef928595ada" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_06dd9f1c-1525-26ac-8777-af6cdc28e5fc" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_06dd9f1c-1525-26ac-8777-af6cdc28e5fc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInLoansHeldForSale" xlink:label="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_8c7bc6be-7937-d753-cba8-2008776666bf" xlink:type="locator" />
    <link:calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_8c7bc6be-7937-d753-cba8-2008776666bf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_0de8de13-3824-9d0d-a270-12d0f2fbdb58" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_0de8de13-3824-9d0d-a270-12d0f2fbdb58" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireHeldToMaturitySecurities" xlink:label="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_3a5a60fd-6807-00fa-b758-39b7b6e16f8a" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_3a5a60fd-6807-00fa-b758-39b7b6e16f8a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_f83012ff-4665-44b7-9890-36c032a5cd11" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_f83012ff-4665-44b7-9890-36c032a5cd11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_b49c7a2f-2986-824d-e7cb-bc082ac0e888" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_b49c7a2f-2986-824d-e7cb-bc082ac0e888" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_15394837-f38b-15ac-34b9-3c880d46492b" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_15394837-f38b-15ac-34b9-3c880d46492b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireLoansAndLeasesHeldForInvestment" xlink:label="loc_us-gaap_PaymentsToAcquireLoansAndLeasesHeldForInvestment_9da69d88-f297-9bf4-f641-5ae267ac4c49" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_PaymentsToAcquireLoansAndLeasesHeldForInvestment_9da69d88-f297-9bf4-f641-5ae267ac4c49" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_f7ed6106-862d-edb5-3fd1-677e7651af64" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_f7ed6106-862d-edb5-3fd1-677e7651af64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fee12b15-6b42-6245-2e2f-ff030b98332c" xlink:type="locator" />
    <link:calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fee12b15-6b42-6245-2e2f-ff030b98332c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9d35c912-5b2d-89f7-eeb3-812a0511db5e" xlink:type="locator" />
    <link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9d35c912-5b2d-89f7-eeb3-812a0511db5e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfOtherRealEstate" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_a2048c05-1a21-5ddf-3a39-18126a9ba584" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_a2048c05-1a21-5ddf-3a39-18126a9ba584" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInDeposits" xlink:label="loc_us-gaap_IncreaseDecreaseInDeposits_01379495-f364-e017-eca1-552db0d80389" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_IncreaseDecreaseInDeposits_01379495-f364-e017-eca1-552db0d80389" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepaymentsOfShortTermDebt" xlink:label="loc_us-gaap_RepaymentsOfShortTermDebt_918f2c1d-af03-b66f-ca7f-78d3e9bffdf3" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_RepaymentsOfShortTermDebt_918f2c1d-af03-b66f-ca7f-78d3e9bffdf3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_2b72fe5f-3c0e-d5e0-8e5c-ad01818e58e5" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_2b72fe5f-3c0e-d5e0-8e5c-ad01818e58e5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromFederalHomeLoanBankAdvances" xlink:label="loc_us-gaap_ProceedsFromFederalHomeLoanBankAdvances_0f077c70-c2ac-cc37-51b0-b763bf40508a" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_ProceedsFromFederalHomeLoanBankAdvances_0f077c70-c2ac-cc37-51b0-b763bf40508a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings" xlink:label="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_13b009f3-3eda-4479-524d-2711dfe256e7" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_13b009f3-3eda-4479-524d-2711dfe256e7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_28e2c436-b745-69c4-35ea-e9f54fef28c6" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_28e2c436-b745-69c4-35ea-e9f54fef28c6" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_ProceedsFromIssuanceOfCommonStockForDividendReinvestmentAndEmployeeBenefitPlans" xlink:label="loc_ucbi_ProceedsFromIssuanceOfCommonStockForDividendReinvestmentAndEmployeeBenefitPlans_4da6440b-439f-03da-67aa-b1db830b7f3f" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_ucbi_ProceedsFromIssuanceOfCommonStockForDividendReinvestmentAndEmployeeBenefitPlans_4da6440b-439f-03da-67aa-b1db830b7f3f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_d04df344-47da-0222-79d0-99b7d739fd60" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_d04df344-47da-0222-79d0-99b7d739fd60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_6d67f644-e190-e5ce-9449-e00a27ad7771" xlink:type="locator" />
    <link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_6d67f644-e190-e5ce-9449-e00a27ad7771" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_8a1490c4-32d9-5132-1fe2-2675a45abdae" xlink:type="locator" />
    <link:calculationArc order="10" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_8a1490c4-32d9-5132-1fe2-2675a45abdae" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_6f80ca9e-82d0-f056-a403-c4914c1ce379" xlink:type="locator" />
    <link:calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_6f80ca9e-82d0-f056-a403-c4914c1ce379" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_ab3008c3-c5c2-a86b-0613-39cbd9b94527" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_7fd05530-dcef-3f65-247b-6b26d31a1b75" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_ab3008c3-c5c2-a86b-0613-39cbd9b94527" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_7fd05530-dcef-3f65-247b-6b26d31a1b75" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_b3c38565-0d02-8626-9105-f3d50d05e2e9" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_ab3008c3-c5c2-a86b-0613-39cbd9b94527" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_b3c38565-0d02-8626-9105-f3d50d05e2e9" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax_475335B42C49A85E2692F185607E8513" xlink:type="locator" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesBeforeTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesBeforeTax_B5E4D8A29413C4163A9DF183C4D91DB7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax_475335B42C49A85E2692F185607E8513" xlink:to="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesBeforeTax_B5E4D8A29413C4163A9DF183C4D91DB7" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax_3A8BC0C131F136561AB6F184A8411E2C" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax_475335B42C49A85E2692F185607E8513" xlink:to="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax_3A8BC0C131F136561AB6F184A8411E2C" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_b47cb5bf-df9e-ea88-4e4a-b1db830a5748" xlink:type="locator" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodBeforeTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodBeforeTax_76d53620-4dd7-4dc2-20b1-b1db830a24a3" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_b47cb5bf-df9e-ea88-4e4a-b1db830a5748" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodBeforeTax_76d53620-4dd7-4dc2-20b1-b1db830a24a3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_d58ac57b-2e86-36b4-7645-929f4187851d" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodBeforeTax_76d53620-4dd7-4dc2-20b1-b1db830a24a3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_d58ac57b-2e86-36b4-7645-929f4187851d" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodBeforeTax_76d53620-4dd7-4dc2-20b1-b1db830a24a3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_7fd05530-dcef-3f65-247b-6b26d31a1b75" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodTaxEffect" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodTaxEffect_2eec2cba-f9de-46e2-1723-b1db830a77b2" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_b47cb5bf-df9e-ea88-4e4a-b1db830a5748" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodTaxEffect_2eec2cba-f9de-46e2-1723-b1db830a77b2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_fce92d33-1a6b-eabb-7aec-b7f763849491" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodTaxEffect_2eec2cba-f9de-46e2-1723-b1db830a77b2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_fce92d33-1a6b-eabb-7aec-b7f763849491" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodTaxEffect_2eec2cba-f9de-46e2-1723-b1db830a77b2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_b3c38565-0d02-8626-9105-f3d50d05e2e9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_a7b5d22e-96eb-ace2-25a7-90129fb72d8e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_086c0c4e-b462-2c01-0468-31b739642a85" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_a7b5d22e-96eb-ace2-25a7-90129fb72d8e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_086c0c4e-b462-2c01-0468-31b739642a85" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_90cadbef-4c1f-dc53-0481-4d312c2e0e3a" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_a7b5d22e-96eb-ace2-25a7-90129fb72d8e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_90cadbef-4c1f-dc53-0481-4d312c2e0e3a" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_518fcb3f-e6cf-ab76-88af-b1db830ae9fa" xlink:type="locator" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_131220fe-cb4b-6d57-8d02-b1db830a92a5" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_518fcb3f-e6cf-ab76-88af-b1db830ae9fa" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_131220fe-cb4b-6d57-8d02-b1db830a92a5" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_fc8a956f-03b4-8ee0-1370-b1db830a1f4e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_518fcb3f-e6cf-ab76-88af-b1db830ae9fa" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_fc8a956f-03b4-8ee0-1370-b1db830a1f4e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_40c18718-8b1a-fd34-6cda-e0e102afbf8e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_40c18718-8b1a-fd34-6cda-e0e102afbf8e" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_40c18718-8b1a-fd34-6cda-e0e102afbf8e" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodBeforeTax_76d53620-4dd7-4dc2-20b1-b1db830a24a3" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_40c18718-8b1a-fd34-6cda-e0e102afbf8e" xlink:to="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesBeforeTax_B5E4D8A29413C4163A9DF183C4D91DB7" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_187fe8fc-269d-ade6-a284-fef92856d8bb" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_40c18718-8b1a-fd34-6cda-e0e102afbf8e" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_187fe8fc-269d-ade6-a284-fef92856d8bb" xlink:type="arc" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_40c18718-8b1a-fd34-6cda-e0e102afbf8e" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_131220fe-cb4b-6d57-8d02-b1db830a92a5" xlink:type="arc" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_40c18718-8b1a-fd34-6cda-e0e102afbf8e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_086c0c4e-b462-2c01-0468-31b739642a85" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_67fd6528-ef4d-3003-0a98-a23807348875" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_67fd6528-ef4d-3003-0a98-a23807348875" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_67fd6528-ef4d-3003-0a98-a23807348875" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodTaxEffect_2eec2cba-f9de-46e2-1723-b1db830a77b2" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_67fd6528-ef4d-3003-0a98-a23807348875" xlink:to="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax_3A8BC0C131F136561AB6F184A8411E2C" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_2860dbd2-be8b-df49-9de6-fef92857c6fb" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_67fd6528-ef4d-3003-0a98-a23807348875" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_2860dbd2-be8b-df49-9de6-fef92857c6fb" xlink:type="arc" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_67fd6528-ef4d-3003-0a98-a23807348875" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_fc8a956f-03b4-8ee0-1370-b1db830a1f4e" xlink:type="arc" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_67fd6528-ef4d-3003-0a98-a23807348875" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_90cadbef-4c1f-dc53-0481-4d312c2e0e3a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_1162958e-3b54-7f44-ae96-63b659f5cdba" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_a2819c76-6e6b-ef50-d84a-ee3776b17eed" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_1162958e-3b54-7f44-ae96-63b659f5cdba" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_a2819c76-6e6b-ef50-d84a-ee3776b17eed" xlink:type="arc" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_a2819c76-6e6b-ef50-d84a-ee3776b17eed" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_086c0c4e-b462-2c01-0468-31b739642a85" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_a2819c76-6e6b-ef50-d84a-ee3776b17eed" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_131220fe-cb4b-6d57-8d02-b1db830a92a5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_ca38c988-9cc2-4eaf-3c4d-bb28cc79dca5" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_1162958e-3b54-7f44-ae96-63b659f5cdba" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_ca38c988-9cc2-4eaf-3c4d-bb28cc79dca5" xlink:type="arc" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_ca38c988-9cc2-4eaf-3c4d-bb28cc79dca5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_90cadbef-4c1f-dc53-0481-4d312c2e0e3a" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_ca38c988-9cc2-4eaf-3c4d-bb28cc79dca5" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_fc8a956f-03b4-8ee0-1370-b1db830a1f4e" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_fabbc729-d8b4-535e-6778-fef9284e1e51" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_fabbc729-d8b4-535e-6778-fef9284e1e51" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_187fe8fc-269d-ade6-a284-fef92856d8bb" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_fabbc729-d8b4-535e-6778-fef9284e1e51" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_2860dbd2-be8b-df49-9de6-fef92857c6fb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:type="locator" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_ComprehensiveIncomeLossBeforeTax" xlink:label="loc_ucbi_ComprehensiveIncomeLossBeforeTax_0570696d-bc49-6d5d-123d-b1db830bbf0c" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_ucbi_ComprehensiveIncomeLossBeforeTax_0570696d-bc49-6d5d-123d-b1db830bbf0c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_ComprehensiveIncomeLossBeforeTax_0570696d-bc49-6d5d-123d-b1db830bbf0c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_ComprehensiveIncomeLossBeforeTax_0570696d-bc49-6d5d-123d-b1db830bbf0c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_40c18718-8b1a-fd34-6cda-e0e102afbf8e" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_ComprehensiveIncomeLossTax" xlink:label="loc_ucbi_ComprehensiveIncomeLossTax_1f5e814e-5e6c-e00b-6d11-b1db830be231" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_ucbi_ComprehensiveIncomeLossTax_1f5e814e-5e6c-e00b-6d11-b1db830be231" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_ComprehensiveIncomeLossTax_1f5e814e-5e6c-e00b-6d11-b1db830be231" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_ComprehensiveIncomeLossTax_1f5e814e-5e6c-e00b-6d11-b1db830be231" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_67fd6528-ef4d-3003-0a98-a23807348875" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_57e8ae74-d8b6-c629-9bee-2d0929cd3999" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_57e8ae74-d8b6-c629-9bee-2d0929cd3999" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_d58ac57b-2e86-36b4-7645-929f4187851d" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_57e8ae74-d8b6-c629-9bee-2d0929cd3999" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_fce92d33-1a6b-eabb-7aec-b7f763849491" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="locator" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnauditedCalc2" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_1162958e-3b54-7f44-ae96-63b659f5cdba" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_a7b5d22e-96eb-ace2-25a7-90129fb72d8e" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_1162958e-3b54-7f44-ae96-63b659f5cdba" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_a7b5d22e-96eb-ace2-25a7-90129fb72d8e" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_518fcb3f-e6cf-ab76-88af-b1db830ae9fa" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_1162958e-3b54-7f44-ae96-63b659f5cdba" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_518fcb3f-e6cf-ab76-88af-b1db830ae9fa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_6B39F4D5144782AAE35C98C1A0D3D67D_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_us-gaap_NetIncomeLoss_6B39F4D5144782AAE35C98C1A0D3D67D_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_b47cb5bf-df9e-ea88-4e4a-b1db830a5748" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_b47cb5bf-df9e-ea88-4e4a-b1db830a5748" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_57e8ae74-d8b6-c629-9bee-2d0929cd3999" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_b47cb5bf-df9e-ea88-4e4a-b1db830a5748" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_57e8ae74-d8b6-c629-9bee-2d0929cd3999" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_ab3008c3-c5c2-a86b-0613-39cbd9b94527" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesNetOfReclassificationAndValuationAllowanceArisingDuringPeriodNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_b47cb5bf-df9e-ea88-4e4a-b1db830a5748" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_ab3008c3-c5c2-a86b-0613-39cbd9b94527" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax_6B39F4D5144782AAE35C98C1A0D3D67D_475335B42C49A85E2692F185607E8513" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:to="loc_ucbi_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesAfterTax_6B39F4D5144782AAE35C98C1A0D3D67D_475335B42C49A85E2692F185607E8513" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_fabbc729-d8b4-535e-6778-fef9284e1e51" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_fabbc729-d8b4-535e-6778-fef9284e1e51" xlink:type="arc" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:to="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_518fcb3f-e6cf-ab76-88af-b1db830ae9fa" xlink:type="arc" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6B39F4D5144782AAE35C98C1A0D3D67D_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_6B39F4D5144782AAE35C98C1A0D3D67D_a7b5d22e-96eb-ace2-25a7-90129fb72d8e" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsOfIncomeUnaudited" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_33f76b65-31cf-be04-0849-25af345446d5" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:to="loc_us-gaap_Revenues_33f76b65-31cf-be04-0849-25af345446d5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_4b7a9f96-e361-95dc-567f-7c30db8e2c0d" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_33f76b65-31cf-be04-0849-25af345446d5" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_4b7a9f96-e361-95dc-567f-7c30db8e2c0d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_1df5100d-c7c3-27c8-1405-81abbd3827e1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_4b7a9f96-e361-95dc-567f-7c30db8e2c0d" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_1df5100d-c7c3-27c8-1405-81abbd3827e1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestAndDividendIncomeOperating" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_4477516e-3843-f1b4-8a61-de669ff8f0e0" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_1df5100d-c7c3-27c8-1405-81abbd3827e1" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_4477516e-3843-f1b4-8a61-de669ff8f0e0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_73eb116a-244c-faca-8f1b-fa72559b1ebe" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_4477516e-3843-f1b4-8a61-de669ff8f0e0" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_73eb116a-244c-faca-8f1b-fa72559b1ebe" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestAndDividendIncomeSecurities" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecurities_1829174e-cfff-643a-37e6-4fac48f6d3ea" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_4477516e-3843-f1b4-8a61-de669ff8f0e0" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecurities_1829174e-cfff-643a-37e6-4fac48f6d3ea" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_FederalFundsSoldCommercialPaperAndDepositsInBanks" xlink:label="loc_ucbi_FederalFundsSoldCommercialPaperAndDepositsInBanks_ec3ce9d7-259a-5a01-b03c-b1db830a6229" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperating_4477516e-3843-f1b4-8a61-de669ff8f0e0" xlink:to="loc_ucbi_FederalFundsSoldCommercialPaperAndDepositsInBanks_ec3ce9d7-259a-5a01-b03c-b1db830a6229" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_1df5100d-c7c3-27c8-1405-81abbd3827e1" xlink:to="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseShortTermBorrowings" xlink:label="loc_us-gaap_InterestExpenseShortTermBorrowings_3b21a485-dd9a-bbcc-544e-c91399070436" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:to="loc_us-gaap_InterestExpenseShortTermBorrowings_3b21a485-dd9a-bbcc-544e-c91399070436" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm" xlink:label="loc_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_7c1b97be-0cd0-924d-b8cf-848e8d3b4013" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:to="loc_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_7c1b97be-0cd0-924d-b8cf-848e8d3b4013" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseLongTermDebt" xlink:label="loc_us-gaap_InterestExpenseLongTermDebt_63b3f3d9-aaf6-59d3-9ec0-1a4d3ed8748e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:to="loc_us-gaap_InterestExpenseLongTermDebt_63b3f3d9-aaf6-59d3-9ec0-1a4d3ed8748e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseDeposits" xlink:label="loc_us-gaap_InterestExpenseDeposits_1b3f3aad-0663-6434-2e85-258ef2ba8cf4" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:to="loc_us-gaap_InterestExpenseDeposits_1b3f3aad-0663-6434-2e85-258ef2ba8cf4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseNegotiableOrderOfWithdrawalNOWDeposits" xlink:label="loc_us-gaap_InterestExpenseNegotiableOrderOfWithdrawalNOWDeposits_20685b12-d88a-32b7-2d6e-3f961c5840ac" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpenseDeposits_1b3f3aad-0663-6434-2e85-258ef2ba8cf4" xlink:to="loc_us-gaap_InterestExpenseNegotiableOrderOfWithdrawalNOWDeposits_20685b12-d88a-32b7-2d6e-3f961c5840ac" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseMoneyMarketDeposits" xlink:label="loc_us-gaap_InterestExpenseMoneyMarketDeposits_4e2540ed-dc98-bbe7-6305-ed879f0af0db" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpenseDeposits_1b3f3aad-0663-6434-2e85-258ef2ba8cf4" xlink:to="loc_us-gaap_InterestExpenseMoneyMarketDeposits_4e2540ed-dc98-bbe7-6305-ed879f0af0db" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseSavingsDeposits" xlink:label="loc_us-gaap_InterestExpenseSavingsDeposits_787d1a1e-a649-6d1d-a468-e3840b52ab64" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpenseDeposits_1b3f3aad-0663-6434-2e85-258ef2ba8cf4" xlink:to="loc_us-gaap_InterestExpenseSavingsDeposits_787d1a1e-a649-6d1d-a468-e3840b52ab64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseTimeDeposits" xlink:label="loc_us-gaap_InterestExpenseTimeDeposits_e3d5d9f5-bee0-7bc5-5d9b-c77d0e94aad5" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpenseDeposits_1b3f3aad-0663-6434-2e85-258ef2ba8cf4" xlink:to="loc_us-gaap_InterestExpenseTimeDeposits_e3d5d9f5-bee0-7bc5-5d9b-c77d0e94aad5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProvisionForLoanAndLeaseLosses" xlink:label="loc_us-gaap_ProvisionForLoanAndLeaseLosses_e0ca8321-ebf3-2764-9c0e-6cfd763aef57" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_4b7a9f96-e361-95dc-567f-7c30db8e2c0d" xlink:to="loc_us-gaap_ProvisionForLoanAndLeaseLosses_e0ca8321-ebf3-2764-9c0e-6cfd763aef57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NoninterestIncome" xlink:label="loc_us-gaap_NoninterestIncome_85d8e349-2d49-3422-00b4-05065a60f6f9" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_33f76b65-31cf-be04-0849-25af345446d5" xlink:to="loc_us-gaap_NoninterestIncome_85d8e349-2d49-3422-00b4-05065a60f6f9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f8614c43-5d24-68f7-ca63-14ebca646494" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_85d8e349-2d49-3422-00b4-05065a60f6f9" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f8614c43-5d24-68f7-ca63-14ebca646494" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_MortgageLoanFeesAndOtherFees" xlink:label="loc_ucbi_MortgageLoanFeesAndOtherFees_DDAEE42B8D64F8A73129EC9E81198C1A" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_85d8e349-2d49-3422-00b4-05065a60f6f9" xlink:to="loc_ucbi_MortgageLoanFeesAndOtherFees_DDAEE42B8D64F8A73129EC9E81198C1A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BrokerageCommissionsRevenue" xlink:label="loc_us-gaap_BrokerageCommissionsRevenue_8a0315e3-e811-f6dc-f046-e29bd708455d" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_85d8e349-2d49-3422-00b4-05065a60f6f9" xlink:to="loc_us-gaap_BrokerageCommissionsRevenue_8a0315e3-e811-f6dc-f046-e29bd708455d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnSaleOfLoansAndLeases" xlink:label="loc_us-gaap_GainLossOnSaleOfLoansAndLeases_2dfe6d7b-73ee-c077-9ace-e6e197a92ddb" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_85d8e349-2d49-3422-00b4-05065a60f6f9" xlink:to="loc_us-gaap_GainLossOnSaleOfLoansAndLeases_2dfe6d7b-73ee-c077-9ace-e6e197a92ddb" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleRealizedGainLoss" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleRealizedGainLoss_A83B418B8726EEEA5620F4239621C952" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_85d8e349-2d49-3422-00b4-05065a60f6f9" xlink:to="loc_ucbi_DebtSecuritiesAvailableForSaleRealizedGainLoss_A83B418B8726EEEA5620F4239621C952" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NoninterestIncomeOther" xlink:label="loc_us-gaap_NoninterestIncomeOther_b50394d5-5591-e33e-ab71-eb420a2150b4" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestIncome_85d8e349-2d49-3422-00b4-05065a60f6f9" xlink:to="loc_us-gaap_NoninterestIncomeOther_b50394d5-5591-e33e-ab71-eb420a2150b4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NoninterestExpense" xlink:label="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:to="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_f279d790-3f69-6bb0-bf56-02597d072677" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_us-gaap_LaborAndRelatedExpense_f279d790-3f69-6bb0-bf56-02597d072677" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_CommunicationsAndEquipment" xlink:label="loc_ucbi_CommunicationsAndEquipment_a0947128-e8dd-71fb-43eb-b1db830bf9fd" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_ucbi_CommunicationsAndEquipment_a0947128-e8dd-71fb-43eb-b1db830bf9fd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OccupancyNet" xlink:label="loc_us-gaap_OccupancyNet_dcfa93d8-21b7-f135-13ea-2a15d58dda33" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_us-gaap_OccupancyNet_dcfa93d8-21b7-f135-13ea-2a15d58dda33" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense" xlink:label="loc_us-gaap_MarketingAndAdvertisingExpense_3abace1b-3fd2-6874-1636-b46a709401c6" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_us-gaap_MarketingAndAdvertisingExpense_3abace1b-3fd2-6874-1636-b46a709401c6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SuppliesAndPostageExpense" xlink:label="loc_us-gaap_SuppliesAndPostageExpense_8c2f66c2-8389-dd05-5a59-b8b092875f8e" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_us-gaap_SuppliesAndPostageExpense_8c2f66c2-8389-dd05-5a59-b8b092875f8e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProfessionalFees" xlink:label="loc_us-gaap_ProfessionalFees_46076b2a-9606-b624-8289-f52fd7fc12d1" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_us-gaap_ProfessionalFees_46076b2a-9606-b624-8289-f52fd7fc12d1" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_FdicAssessmentsAndOtherRegulatoryCharges" xlink:label="loc_ucbi_FdicAssessmentsAndOtherRegulatoryCharges_cf680f01-2cb7-966d-0446-b1db830b7fdd" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_ucbi_FdicAssessmentsAndOtherRegulatoryCharges_cf680f01-2cb7-966d-0446-b1db830b7fdd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_ae796c5c-1c01-d654-6a3c-3b5dd2c89517" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_ae796c5c-1c01-d654-6a3c-3b5dd2c89517" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_b040d8af-154d-5cff-3bde-e86e72dcfffc" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_b040d8af-154d-5cff-3bde-e86e72dcfffc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherNoninterestExpense" xlink:label="loc_us-gaap_OtherNoninterestExpense_02adc972-ee35-2b4e-07cf-dcb0252789fc" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_b9eb1ceb-6771-3351-1281-e8b3cd4f24bc" xlink:to="loc_us-gaap_OtherNoninterestExpense_02adc972-ee35-2b4e-07cf-dcb0252789fc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/ConsolidatedStatementsOfIncomeUnauditedParentheticals" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesAndHedgingActivities" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesAndHedgingActivitiesDerivativesDesignatedAsHedgingInstrumentsUnderAsc815Details" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesAndHedgingActivitiesDerivativesInFairValueHedgingRelationshipsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesAndHedgingActivitiesDerivativesNotDesignatedAsHedgingInstrumentsUnderAsc815Details" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesAndHedgingActivitiesGainsAndLossesRecognizedInIncomeOnDerivativesNotDesignatedAsHedgingInstrumentDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesAndHedgingActivitiesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/DerivativesAndHedgingActivitiesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/EarningsPerShare" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_E1035BA83A175ACBB35547416869486E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_82C4A4DA2A395482A04E71D22AB70405" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_E1035BA83A175ACBB35547416869486E" xlink:to="loc_us-gaap_NetIncomeLoss_82C4A4DA2A395482A04E71D22AB70405" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic" xlink:label="loc_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic_C8DCA9DE079D51ACA2AA24B3AC3387AF" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_E1035BA83A175ACBB35547416869486E" xlink:to="loc_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic_C8DCA9DE079D51ACA2AA24B3AC3387AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_FEF555E8FBFF5E59AEAFABC1945BC8F8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_47FF3E8077F05BF19837F17E74C19EF1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_FEF555E8FBFF5E59AEAFABC1945BC8F8" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_47FF3E8077F05BF19837F17E74C19EF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_AFD12D43DA0C533195C970FDB0AC389F" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_FEF555E8FBFF5E59AEAFABC1945BC8F8" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_AFD12D43DA0C533195C970FDB0AC389F" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/EarningsPerShareNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/EarningsPerShareTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/IncomeTaxes" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLosses" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesAgingOfRecordedInvestmentInPastDueLoansDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDue" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDue_a2853db1-cebd-a17c-f6ff-3ade2a726584" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDue_a2853db1-cebd-a17c-f6ff-3ade2a726584" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentCurrent" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentCurrent_38a9b0f0-99cf-7bf1-a2e9-09df10077c91" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentCurrent_38a9b0f0-99cf-7bf1-a2e9-09df10077c91" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_71f1da56-c7e2-37f6-86ea-abd4453d66e9" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_71f1da56-c7e2-37f6-86ea-abd4453d66e9" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesAverageBalancesOfImpairedLoansAndIncomeRecognizedOnImpairedLoansDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesBalanceAndActivityInAllowanceForLoanLossesByPortfolioSegmentAndRecordedInvestmentInLoansByPortfolioSegmentDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesChangesInValueOfAccretableYieldForAcquiredLoansDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesComponentsOfNetInvestmentInLeasesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DirectFinancingLeaseNetInvestmentInLease" xlink:label="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLease_286b524f-4f8c-c1cf-13f0-73a5a01f97f0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DirectFinancingLeaseLeaseReceivable" xlink:label="loc_us-gaap_DirectFinancingLeaseLeaseReceivable_aec5711f-ba1b-a59e-e4a3-ba1a133b4f11" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLease_286b524f-4f8c-c1cf-13f0-73a5a01f97f0" xlink:to="loc_us-gaap_DirectFinancingLeaseLeaseReceivable_aec5711f-ba1b-a59e-e4a3-ba1a133b4f11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DirectFinancingLeaseUnguaranteedResidualAsset" xlink:label="loc_us-gaap_DirectFinancingLeaseUnguaranteedResidualAsset_e0a255bc-6229-7e41-a11a-cc21dfb7b4b2" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLease_286b524f-4f8c-c1cf-13f0-73a5a01f97f0" xlink:to="loc_us-gaap_DirectFinancingLeaseUnguaranteedResidualAsset_e0a255bc-6229-7e41-a11a-cc21dfb7b4b2" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DirectFinancingLeaseInitialDirectCosts" xlink:label="loc_ucbi_DirectFinancingLeaseInitialDirectCosts_779DDC3F4F1C95BA5DB498889ED1E00A" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLease_286b524f-4f8c-c1cf-13f0-73a5a01f97f0" xlink:to="loc_ucbi_DirectFinancingLeaseInitialDirectCosts_779DDC3F4F1C95BA5DB498889ED1E00A" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DirectFinancingLeaseSecurityDeposits" xlink:label="loc_ucbi_DirectFinancingLeaseSecurityDeposits_4ED6FBF6D8E4C10F4C91988B8C5585BA" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLease_286b524f-4f8c-c1cf-13f0-73a5a01f97f0" xlink:to="loc_ucbi_DirectFinancingLeaseSecurityDeposits_4ED6FBF6D8E4C10F4C91988B8C5585BA" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DirectFinancingLeasePurchaseAccountingPremium" xlink:label="loc_ucbi_DirectFinancingLeasePurchaseAccountingPremium_C1657F555F9A348D9990988984E165E5" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLease_286b524f-4f8c-c1cf-13f0-73a5a01f97f0" xlink:to="loc_ucbi_DirectFinancingLeasePurchaseAccountingPremium_C1657F555F9A348D9990988984E165E5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DirectFinancingLeaseDeferredSellingProfit" xlink:label="loc_us-gaap_DirectFinancingLeaseDeferredSellingProfit_1fc1b0f2-e64f-6986-d3c2-8e6458b2cd38" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLease_286b524f-4f8c-c1cf-13f0-73a5a01f97f0" xlink:to="loc_us-gaap_DirectFinancingLeaseDeferredSellingProfit_1fc1b0f2-e64f-6986-d3c2-8e6458b2cd38" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesLoansIndividuallyEvaluatedForImpairmentByClassOfLoansDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairedFinancingReceivableRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_15a0be6e-6399-7796-5a21-351d6bdf38c0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_cc47adb0-1bde-8a7e-893c-e21dfd67fbcc" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_15a0be6e-6399-7796-5a21-351d6bdf38c0" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_cc47adb0-1bde-8a7e-893c-e21dfd67fbcc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_be7a8a02-ce08-c29c-f736-c19574a96602" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_15a0be6e-6399-7796-5a21-351d6bdf38c0" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_be7a8a02-ce08-c29c-f736-c19574a96602" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_ca37a9dd-c284-285c-ef7c-6fd13d2d1f07" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance_6c5d17c5-8bf9-32e4-45d8-0c81f3d83e11" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_ca37a9dd-c284-285c-ef7c-6fd13d2d1f07" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance_6c5d17c5-8bf9-32e4-45d8-0c81f3d83e11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_363cf147-7020-38c5-2ad2-e05d16e99e50" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_ca37a9dd-c284-285c-ef7c-6fd13d2d1f07" xlink:to="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_363cf147-7020-38c5-2ad2-e05d16e99e50" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesLoansModifiedUnderTermsOfTdrDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesMajorClassificationsOfLoansDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesMinimumFutureLeasePaymentToBeReceivedDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_e3acbf83-ad0b-0e5c-ca05-c39fd390d08e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_1669d573-c16c-d6c4-c135-c7be7acec98c" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_e3acbf83-ad0b-0e5c-ca05-c39fd390d08e" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_1669d573-c16c-d6c4-c135-c7be7acec98c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_a972ea53-3c95-cf14-6b6d-0db38cd4ce32" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_e3acbf83-ad0b-0e5c-ca05-c39fd390d08e" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_a972ea53-3c95-cf14-6b6d-0db38cd4ce32" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_d6bd9a11-7979-5a3c-6fd9-e9b35aef26e9" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_e3acbf83-ad0b-0e5c-ca05-c39fd390d08e" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_d6bd9a11-7979-5a3c-6fd9-e9b35aef26e9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_3652eb0c-043a-4a51-908c-5ed573850a68" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_e3acbf83-ad0b-0e5c-ca05-c39fd390d08e" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_3652eb0c-043a-4a51-908c-5ed573850a68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_c1733749-e610-572b-4743-02684488ac42" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_e3acbf83-ad0b-0e5c-ca05-c39fd390d08e" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_c1733749-e610-572b-4743-02684488ac42" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter_f7429513-4d47-576a-09b2-60dfae5b67e1" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_e3acbf83-ad0b-0e5c-ca05-c39fd390d08e" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter_f7429513-4d47-576a-09b2-60dfae5b67e1" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesRecordedInvestmentInLoansByPortfolioSegmentAndBalanceOfAllowanceForLoanLossesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_2728da51-6cce-af3e-5ce7-dffdc8662526" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_2728da51-6cce-af3e-5ce7-dffdc8662526" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment" xlink:label="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_85116712-b047-8f0c-ec82-a503d282893f" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:to="loc_us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment_85116712-b047-8f0c-ec82-a503d282893f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_71f1da56-c7e2-37f6-86ea-abd4453d66e9" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_99b7c0b8-78d1-c66a-eb0a-fb20f225718b" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_71f1da56-c7e2-37f6-86ea-abd4453d66e9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_036192b7-713e-6ea9-e0e5-da889f02341f" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_2d64eba2-d0e8-c45b-dd29-fc9458833902" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_036192b7-713e-6ea9-e0e5-da889f02341f" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_2d64eba2-d0e8-c45b-dd29-fc9458833902" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_aec103a3-1896-0ed9-655b-7cb3d159483f" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_036192b7-713e-6ea9-e0e5-da889f02341f" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_aec103a3-1896-0ed9-655b-7cb3d159483f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses_ce13dbe7-0e7e-4883-5cda-1b9ad5639c2e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_036192b7-713e-6ea9-e0e5-da889f02341f" xlink:to="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses_ce13dbe7-0e7e-4883-5cda-1b9ad5639c2e" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesRecordedInvestmentInNonaccrualLoansByLoanClassDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesRiskCategoryOfLoansByClassOfLoansDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/LoansAndLeasesAndAllowanceForCreditLossesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeases" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesFutureMinimumLeasePaymentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_593b0660-12f9-6d6c-379f-995151b96f12" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_593b0660-12f9-6d6c-379f-995151b96f12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_9ae85d5a-3597-15dc-9f7d-54768ef1f006" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_9ae85d5a-3597-15dc-9f7d-54768ef1f006" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_ec9b62cf-b4a7-5e2e-d2cd-5a1d24f5e7e6" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_ec9b62cf-b4a7-5e2e-d2cd-5a1d24f5e7e6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_cb1443c4-2a44-05fb-8cc4-775c5b49860d" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_cb1443c4-2a44-05fb-8cc4-775c5b49860d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_1cca95ce-efd9-0081-bba5-460f648f5375" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_1cca95ce-efd9-0081-bba5-460f648f5375" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_f3b7076a-a72b-878f-bf54-0772ea24ed04" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_f3b7076a-a72b-878f-bf54-0772ea24ed04" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesFutureMinimumLeasePaymentsDetailsCalc2" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_F3A37A656B52463495938A420DF0257F_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_F3A37A656B52463495938A420DF0257F_92a886fe-a438-0e66-1f69-c021ff737659" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_F3A37A656B52463495938A420DF0257F_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_F3A37A656B52463495938A420DF0257F_92a886fe-a438-0e66-1f69-c021ff737659" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_F3A37A656B52463495938A420DF0257F_1f3a7784-58d8-af23-affd-e8ac4c306bd8" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_F3A37A656B52463495938A420DF0257F_2e43173b-4def-1f33-241f-784f8fd97fb0" xlink:to="loc_us-gaap_OperatingLeaseLiability_F3A37A656B52463495938A420DF0257F_1f3a7784-58d8-af23-affd-e8ac4c306bd8" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesOperatingLeaseIncomeAndExpenseAndOtherSupplementalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_2c458fb6-1579-cbe0-fa49-ac8c90fa335a" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_2e50c06f-ed58-2d01-8792-051f85c22aca" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_2c458fb6-1579-cbe0-fa49-ac8c90fa335a" xlink:to="loc_us-gaap_OperatingLeaseCost_2e50c06f-ed58-2d01-8792-051f85c22aca" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableLeaseCost" xlink:label="loc_us-gaap_VariableLeaseCost_aa3d7207-63b7-41f9-d02f-e7cabf383590" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_2c458fb6-1579-cbe0-fa49-ac8c90fa335a" xlink:to="loc_us-gaap_VariableLeaseCost_aa3d7207-63b7-41f9-d02f-e7cabf383590" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="loc_us-gaap_ShortTermLeaseCost_75d81425-8873-89ef-dc91-39c256e67d0d" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_2c458fb6-1579-cbe0-fa49-ac8c90fa335a" xlink:to="loc_us-gaap_ShortTermLeaseCost_75d81425-8873-89ef-dc91-39c256e67d0d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaap_SubleaseIncome_dc10fed0-3c26-6ce9-d482-3546b69e7244" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_2c458fb6-1579-cbe0-fa49-ac8c90fa335a" xlink:to="loc_us-gaap_SubleaseIncome_dc10fed0-3c26-6ce9-d482-3546b69e7244" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/OperatingLeasesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/ReclassificationsOutOfAccumulatedOtherComprehensiveIncome" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/ReclassificationsOutOfAccumulatedOtherComprehensiveIncomeTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/Securities" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesAmortizedCostAndFairValueOfHeldToMaturityAndAvailableForSaleSecuritiesByContractualMaturityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_317678d5-aa75-7221-6f7e-512a1e9594ce" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_11845fde-86d7-5d4f-f95f-2ff0c69033cf" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_317678d5-aa75-7221-6f7e-512a1e9594ce" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_11845fde-86d7-5d4f-f95f-2ff0c69033cf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_bb8c0b1e-fd9f-a5c4-e603-c98e3365d87d" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_317678d5-aa75-7221-6f7e-512a1e9594ce" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_bb8c0b1e-fd9f-a5c4-e603-c98e3365d87d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_00f917b5-f7f5-5ac4-6c9e-e7da92e61db9" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_317678d5-aa75-7221-6f7e-512a1e9594ce" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_00f917b5-f7f5-5ac4-6c9e-e7da92e61db9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue_fb085eea-83ea-9ce6-514c-2e80a091553a" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesFairValue_317678d5-aa75-7221-6f7e-512a1e9594ce" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue_fb085eea-83ea-9ce6-514c-2e80a091553a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_46f75f3f-4ced-36de-04ea-a031e3d4605c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_01f5fca0-0070-5249-0eb7-1cb84a39b7e6" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_46f75f3f-4ced-36de-04ea-a031e3d4605c" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_01f5fca0-0070-5249-0eb7-1cb84a39b7e6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_12128751-e7de-aad7-24b3-5ab9e63f309b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_46f75f3f-4ced-36de-04ea-a031e3d4605c" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_12128751-e7de-aad7-24b3-5ab9e63f309b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_9b0a2925-c38c-2c54-df67-7b5d234b8836" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_46f75f3f-4ced-36de-04ea-a031e3d4605c" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_9b0a2925-c38c-2c54-df67-7b5d234b8836" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_991033c0-c528-5d4a-c165-d7ea56370526" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_46f75f3f-4ced-36de-04ea-a031e3d4605c" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_991033c0-c528-5d4a-c165-d7ea56370526" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fc961581-2899-aa00-cc82-b67bd4267bb3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_e23e956e-6d3a-7b53-c662-14b8b922e4d7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fc961581-2899-aa00-cc82-b67bd4267bb3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_e23e956e-6d3a-7b53-c662-14b8b922e4d7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_036a6f5c-05ce-dc1a-9b58-e6338f89f0c1" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fc961581-2899-aa00-cc82-b67bd4267bb3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_036a6f5c-05ce-dc1a-9b58-e6338f89f0c1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis_06175534-8ac5-fc96-dd10-7102d5989d46" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fc961581-2899-aa00-cc82-b67bd4267bb3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis_06175534-8ac5-fc96-dd10-7102d5989d46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_ddab5c86-f56d-2ebd-8d33-52d44342102a" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fc961581-2899-aa00-cc82-b67bd4267bb3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_ddab5c86-f56d-2ebd-8d33-52d44342102a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_764bcdd4-873e-b243-70d2-5e6b13e98cf7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_764bcdd4-873e-b243-70d2-5e6b13e98cf7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_e43ecc2e-e30d-adce-13de-ad342aacc705" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_e43ecc2e-e30d-adce-13de-ad342aacc705" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_32a10326-5fac-2d4e-ebe4-d0b3d261f0aa" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_32a10326-5fac-2d4e-ebe4-d0b3d261f0aa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue_35f8f7f2-8f7e-5afd-f112-d64048dc0db3" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue_35f8f7f2-8f7e-5afd-f112-d64048dc0db3" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesAmortizedCostGrossUnrealizedGainsAndLossesAndFairValueOfDebtSecuritiesAvailableForSaleDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fc961581-2899-aa00-cc82-b67bd4267bb3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_bb34ca49-0ca6-d513-414f-31e205fa11cc" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fc961581-2899-aa00-cc82-b67bd4267bb3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_bb34ca49-0ca6-d513-414f-31e205fa11cc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_fa6902f3-9ec3-0632-57ef-52a27e57695e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fc961581-2899-aa00-cc82-b67bd4267bb3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_fa6902f3-9ec3-0632-57ef-52a27e57695e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_fc961581-2899-aa00-cc82-b67bd4267bb3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_2c867d9b-5594-18ef-c82a-679b606d1bd3" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesAmortizedCostGrossUnrealizedGainsAndLossesAndFairValueOfDebtSecuritiesHeldToMaturityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_46f75f3f-4ced-36de-04ea-a031e3d4605c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_034611ea-64e8-e6ac-6b57-530c530d2463" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_46f75f3f-4ced-36de-04ea-a031e3d4605c" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_034611ea-64e8-e6ac-6b57-530c530d2463" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_04cbaa59-5eb0-e143-0a21-a553da1ab158" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_46f75f3f-4ced-36de-04ea-a031e3d4605c" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_04cbaa59-5eb0-e143-0a21-a553da1ab158" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_317678d5-aa75-7221-6f7e-512a1e9594ce" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_46f75f3f-4ced-36de-04ea-a031e3d4605c" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_317678d5-aa75-7221-6f7e-512a1e9594ce" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesSummaryOfAvailableForSaleSecuritiesSalesActivityDetails" xlink:type="extended">
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleRealizedGainLoss" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleRealizedGainLoss_A83B418B8726EEEA5620F4239621C952" xlink:type="locator" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleRealizedGain" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleRealizedGain_D0A74898592BDF15C3ADF421471D4835" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_DebtSecuritiesAvailableForSaleRealizedGainLoss_A83B418B8726EEEA5620F4239621C952" xlink:to="loc_ucbi_DebtSecuritiesAvailableForSaleRealizedGain_D0A74898592BDF15C3ADF421471D4835" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleRealizedLoss" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleRealizedLoss_D6EDAA01813CF79CF9B7F42279B5D849" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_DebtSecuritiesAvailableForSaleRealizedGainLoss_A83B418B8726EEEA5620F4239621C952" xlink:to="loc_ucbi_DebtSecuritiesAvailableForSaleRealizedLoss_D6EDAA01813CF79CF9B7F42279B5D849" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesSummaryOfDebtSecuritesHeldToMaturityInUnrealizedLossPositionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_947ee1eb-a5d1-bf7e-cbaf-6cd320658e38" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_5591543c-e106-9160-fa18-4366844ee790" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_947ee1eb-a5d1-bf7e-cbaf-6cd320658e38" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_5591543c-e106-9160-fa18-4366844ee790" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_5a6ef725-4b6e-9e35-fba2-5b883d021434" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_947ee1eb-a5d1-bf7e-cbaf-6cd320658e38" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_5a6ef725-4b6e-9e35-fba2-5b883d021434" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_ae410534-ff1f-afef-7c75-bbe62f56894d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_4b9ba026-7273-0821-7d62-bb1019365c55" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_ae410534-ff1f-afef-7c75-bbe62f56894d" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_4b9ba026-7273-0821-7d62-bb1019365c55" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_da993c7c-63f5-a242-9f8a-6e9d9ff288c6" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_ae410534-ff1f-afef-7c75-bbe62f56894d" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_da993c7c-63f5-a242-9f8a-6e9d9ff288c6" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesSummaryOfDebtSecuritiesAvailableForSaleInUnrealizedLossPositionDetails" xlink:type="extended">
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_B56070D595281B44CC0BF40AF87656F9" xlink:type="locator" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_4149BFA92F3B6AF5A6D7F407F14E080B" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_B56070D595281B44CC0BF40AF87656F9" xlink:to="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_4149BFA92F3B6AF5A6D7F407F14E080B" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_359EBC06A4B0431EECE4F4096765E96A" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_B56070D595281B44CC0BF40AF87656F9" xlink:to="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_359EBC06A4B0431EECE4F4096765E96A" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleUnrealizedLossPosition" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_5EE340B448B69CAD3385F405FF202AA8" xlink:type="locator" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_32B37A02DA496B092EECF4039D8A253F" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_5EE340B448B69CAD3385F405FF202AA8" xlink:to="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_32B37A02DA496B092EECF4039D8A253F" xlink:type="arc" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_74D1565A4307CDB99E8DF404F77BCFE6" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ucbi_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_5EE340B448B69CAD3385F405FF202AA8" xlink:to="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_74D1565A4307CDB99E8DF404F77BCFE6" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://ucbi.com/role/SecuritiesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensationRestrictedStockUnitActivityDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensationStockOptionActivityDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/StockBasedCompensationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/SubsequentEvents" xlink:type="extended" />
  <link:calculationLink xlink:role="http://ucbi.com/role/SubsequentEventsNarrativeDetails" xlink:type="extended" />
</link:linkbase>
