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    <link:label id="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_24C54CD1A1F89E8BF8086D329710B66C_documentation_en-US" xlink:label="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_24C54CD1A1F89E8BF8086D329710B66C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the dealer offset to customer swap position.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_DealerOffsetToCustomerSwapPositionMember" xlink:label="loc_ucbi_DealerOffsetToCustomerSwapPositionMember_24C54CD1A1F89E8BF8086D329710B66C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DealerOffsetToCustomerSwapPositionMember_24C54CD1A1F89E8BF8086D329710B66C" xlink:to="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_24C54CD1A1F89E8BF8086D329710B66C" xlink:type="arc" />
    <link:label id="lab_ucbi_RiskParticipationsMember_5EF575899E6FE6AB425C6D329710F05F_verboseLabel_en-US" xlink:label="lab_ucbi_RiskParticipationsMember_5EF575899E6FE6AB425C6D329710F05F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Risk participations</link:label>
    <link:label id="lab_ucbi_RiskParticipationsMember_5EF575899E6FE6AB425C6D329710F05F_label_en-US" xlink:label="lab_ucbi_RiskParticipationsMember_5EF575899E6FE6AB425C6D329710F05F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Risk Participations [Member]</link:label>
    <link:label id="lab_ucbi_RiskParticipationsMember_5EF575899E6FE6AB425C6D329710F05F_documentation_en-US" xlink:label="lab_ucbi_RiskParticipationsMember_5EF575899E6FE6AB425C6D329710F05F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information about risk participations.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_RiskParticipationsMember" xlink:label="loc_ucbi_RiskParticipationsMember_5EF575899E6FE6AB425C6D329710F05F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RiskParticipationsMember_5EF575899E6FE6AB425C6D329710F05F" xlink:to="lab_ucbi_RiskParticipationsMember_5EF575899E6FE6AB425C6D329710F05F" xlink:type="arc" />
    <link:label id="lab_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D_verboseLabel_en-US" xlink:label="lab_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Mortgage banking - loan commitment</link:label>
    <link:label id="lab_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D_label_en-US" xlink:label="lab_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage Banking Loan Commitment [Member]</link:label>
    <link:label id="lab_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D_documentation_en-US" xlink:label="lab_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information of mortgage banking - loan commitment.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_MortgageBankingLoanCommitmentMember" xlink:label="loc_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D" xlink:to="lab_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D" xlink:type="arc" />
    <link:label id="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8_verboseLabel_en-US" xlink:label="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Mortgage banking - forward sales commitment</link:label>
    <link:label id="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8_label_en-US" xlink:label="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage Banking Forward Sales Commitment [Member]</link:label>
    <link:label id="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8_documentation_en-US" xlink:label="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents mortgage banking - forward sales commitment.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_MortgageBankingForwardSalesCommitmentMember" xlink:label="loc_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8" xlink:to="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8" xlink:type="arc" />
    <link:label id="lab_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71_verboseLabel_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Bifurcated embedded derivatives</link:label>
    <link:label id="lab_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71_label_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bifurcated Embedded Derivative [Member]</link:label>
    <link:label id="lab_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71_documentation_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the bifurcated embedded derivatives.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_BifurcatedEmbeddedDerivativeMember" xlink:label="loc_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71" xlink:to="lab_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71" xlink:type="arc" />
    <link:label id="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338_verboseLabel_en-US" xlink:label="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Dealer offsets to bifurcated embedded derivatives</link:label>
    <link:label id="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338_label_en-US" xlink:label="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dealer Offsets To Bifurcated Embedded Derivatives [Member]</link:label>
    <link:label id="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338_documentation_en-US" xlink:label="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the dealer offsets to bifurcated embedded derivatives.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember" xlink:label="loc_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338" xlink:to="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338" xlink:type="arc" />
    <link:label id="lab_ucbi_DeDesignatedCashFlowHedgeMember_C79FD775C662D948455D6D3297117A4D_terseLabel_en-US" xlink:label="lab_ucbi_DeDesignatedCashFlowHedgeMember_C79FD775C662D948455D6D3297117A4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">De-designated hedges</link:label>
    <link:label id="lab_ucbi_DeDesignatedCashFlowHedgeMember_C79FD775C662D948455D6D3297117A4D_label_en-US" xlink:label="lab_ucbi_DeDesignatedCashFlowHedgeMember_C79FD775C662D948455D6D3297117A4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">De Designated Cash Flow Hedge [Member]</link:label>
    <link:label id="lab_ucbi_DeDesignatedCashFlowHedgeMember_C79FD775C662D948455D6D3297117A4D_documentation_en-US" xlink:label="lab_ucbi_DeDesignatedCashFlowHedgeMember_C79FD775C662D948455D6D3297117A4D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents de-designated cash flow hedge.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_DeDesignatedCashFlowHedgeMember" xlink:label="loc_ucbi_DeDesignatedCashFlowHedgeMember_C79FD775C662D948455D6D3297117A4D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DeDesignatedCashFlowHedgeMember_C79FD775C662D948455D6D3297117A4D" xlink:to="lab_ucbi_DeDesignatedCashFlowHedgeMember_C79FD775C662D948455D6D3297117A4D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativesFairValueLineItems_291031B35A7E023893266D329711AF33_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativesFairValueLineItems_291031B35A7E023893266D329711AF33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivatives, Fair Value [Line Items]</link:label>
    <link:label id="lab_us-gaap_DerivativesFairValueLineItems_291031B35A7E023893266D329711AF33_label_en-US" xlink:label="lab_us-gaap_DerivativesFairValueLineItems_291031B35A7E023893266D329711AF33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivatives, Fair Value [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_291031B35A7E023893266D329711AF33" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_291031B35A7E023893266D329711AF33" xlink:to="lab_us-gaap_DerivativesFairValueLineItems_291031B35A7E023893266D329711AF33" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_C7DB53603C8327AB77E26D329711FE0B_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_C7DB53603C8327AB77E26D329711FE0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest rate derivative instruments not designated as hedging instruments, assets at fair value</link:label>
    <link:label id="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_C7DB53603C8327AB77E26D329711FE0B_label_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_C7DB53603C8327AB77E26D329711FE0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_C7DB53603C8327AB77E26D329711FE0B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_C7DB53603C8327AB77E26D329711FE0B" xlink:to="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_C7DB53603C8327AB77E26D329711FE0B" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_B195A0E55158BFACA9616D3297121B34_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_B195A0E55158BFACA9616D3297121B34" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest rate derivative instruments not designated as hedging instruments, liabilities at fair value</link:label>
    <link:label id="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_B195A0E55158BFACA9616D3297121B34_label_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_B195A0E55158BFACA9616D3297121B34" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_B195A0E55158BFACA9616D3297121B34" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_B195A0E55158BFACA9616D3297121B34" xlink:to="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_B195A0E55158BFACA9616D3297121B34" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueDisclosuresAbstract_E2736C79F3A1896AA26DF747E2A6FA35_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract_E2736C79F3A1896AA26DF747E2A6FA35" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_E2736C79F3A1896AA26DF747E2A6FA35" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_E2736C79F3A1896AA26DF747E2A6FA35" xlink:to="lab_us-gaap_FairValueDisclosuresAbstract_E2736C79F3A1896AA26DF747E2A6FA35" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C35008A54AC0892E1A32F747E2B8AD6D_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C35008A54AC0892E1A32F747E2B8AD6D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Recurring and Nonrecurring [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C35008A54AC0892E1A32F747E2B8AD6D_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C35008A54AC0892E1A32F747E2B8AD6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Recurring and Nonrecurring [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C35008A54AC0892E1A32F747E2B8AD6D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C35008A54AC0892E1A32F747E2B8AD6D" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_C35008A54AC0892E1A32F747E2B8AD6D" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByMeasurementBasisAxis_9F082429860949190CBEF747E2B9D6F8_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementBasisAxis_9F082429860949190CBEF747E2B9D6F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Basis [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByMeasurementBasisAxis_9F082429860949190CBEF747E2B9D6F8_label_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementBasisAxis_9F082429860949190CBEF747E2B9D6F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Basis [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_9F082429860949190CBEF747E2B9D6F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_9F082429860949190CBEF747E2B9D6F8" xlink:to="lab_us-gaap_FairValueByMeasurementBasisAxis_9F082429860949190CBEF747E2B9D6F8" xlink:type="arc" />
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    <link:label id="lab_ucbi_OwnerOccupiedCommercialRealEstateMember_139E89AAD3932C6C3EC4F747E306BBDD_documentation_en-US" xlink:label="lab_ucbi_OwnerOccupiedCommercialRealEstateMember_139E89AAD3932C6C3EC4F747E306BBDD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information of owner occupied commercial real estate.</link:label>
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    <link:label id="lab_ucbi_IncomeProducingCommercialRealEstateMember_BA3B06334C7432C5FAD2F747E3063E91_verboseLabel_en-US" xlink:label="lab_ucbi_IncomeProducingCommercialRealEstateMember_BA3B06334C7432C5FAD2F747E3063E91" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income producing commercial real estate</link:label>
    <link:label id="lab_ucbi_IncomeProducingCommercialRealEstateMember_BA3B06334C7432C5FAD2F747E3063E91_label_en-US" xlink:label="lab_ucbi_IncomeProducingCommercialRealEstateMember_BA3B06334C7432C5FAD2F747E3063E91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Producing Commercial Real Estate [Member]</link:label>
    <link:label id="lab_ucbi_IncomeProducingCommercialRealEstateMember_BA3B06334C7432C5FAD2F747E3063E91_documentation_en-US" xlink:label="lab_ucbi_IncomeProducingCommercialRealEstateMember_BA3B06334C7432C5FAD2F747E3063E91" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Property that represents income producing commercial real estate.</link:label>
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    <link:label id="lab_ucbi_CommercialAndIndustrialClassificationMember_AA5C6A319CF6A9C9EAB2F747E306B014_terseLabel_en-US" xlink:label="lab_ucbi_CommercialAndIndustrialClassificationMember_AA5C6A319CF6A9C9EAB2F747E306B014" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial &amp; industrial</link:label>
    <link:label id="lab_ucbi_CommercialAndIndustrialClassificationMember_AA5C6A319CF6A9C9EAB2F747E306B014_label_en-US" xlink:label="lab_ucbi_CommercialAndIndustrialClassificationMember_AA5C6A319CF6A9C9EAB2F747E306B014" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial And Industrial Classification [Member]</link:label>
    <link:label id="lab_ucbi_CommercialAndIndustrialClassificationMember_AA5C6A319CF6A9C9EAB2F747E306B014_documentation_en-US" xlink:label="lab_ucbi_CommercialAndIndustrialClassificationMember_AA5C6A319CF6A9C9EAB2F747E306B014" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Commercial And Industrial Classification[Member]</link:label>
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    <link:label id="lab_us-gaap_ResidentialMortgageMember_94390481B3429BD18B9EF747E306EB05_verboseLabel_en-US" xlink:label="lab_us-gaap_ResidentialMortgageMember_94390481B3429BD18B9EF747E306EB05" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage</link:label>
    <link:label id="lab_us-gaap_ResidentialMortgageMember_94390481B3429BD18B9EF747E306EB05_label_en-US" xlink:label="lab_us-gaap_ResidentialMortgageMember_94390481B3429BD18B9EF747E306EB05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage [Member]</link:label>
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    <link:label id="lab_us-gaap_HomeEquityMember_EBDEF88750AA044E0C92F747E306BD3A_verboseLabel_en-US" xlink:label="lab_us-gaap_HomeEquityMember_EBDEF88750AA044E0C92F747E306BD3A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Home equity lines of credit</link:label>
    <link:label id="lab_us-gaap_HomeEquityMember_EBDEF88750AA044E0C92F747E306BD3A_label_en-US" xlink:label="lab_us-gaap_HomeEquityMember_EBDEF88750AA044E0C92F747E306BD3A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Home Equity Line of Credit [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HomeEquityMember" xlink:label="loc_us-gaap_HomeEquityMember_EBDEF88750AA044E0C92F747E306BD3A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AutomobileLoanMember_46A9A7CFF56978D7AB55F747E30614B5_verboseLabel_en-US" xlink:label="lab_us-gaap_AutomobileLoanMember_46A9A7CFF56978D7AB55F747E30614B5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Indirect auto</link:label>
    <link:label id="lab_us-gaap_AutomobileLoanMember_46A9A7CFF56978D7AB55F747E30614B5_label_en-US" xlink:label="lab_us-gaap_AutomobileLoanMember_46A9A7CFF56978D7AB55F747E30614B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Automobile Loan [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AutomobileLoanMember" xlink:label="loc_us-gaap_AutomobileLoanMember_46A9A7CFF56978D7AB55F747E30614B5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ConstructionLoansMember_129D56307DCFC3DFD049F747E307393A_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionLoansMember_129D56307DCFC3DFD049F747E307393A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction</link:label>
    <link:label id="lab_us-gaap_ConstructionLoansMember_129D56307DCFC3DFD049F747E307393A_label_en-US" xlink:label="lab_us-gaap_ConstructionLoansMember_129D56307DCFC3DFD049F747E307393A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction Loans [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConstructionLoansMember" xlink:label="loc_us-gaap_ConstructionLoansMember_129D56307DCFC3DFD049F747E307393A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConstructionLoansMember_129D56307DCFC3DFD049F747E307393A" xlink:to="lab_us-gaap_ConstructionLoansMember_129D56307DCFC3DFD049F747E307393A" xlink:type="arc" />
    <link:label id="lab_ucbi_EquipmentFinancingMember_F28E98DED5F681817451F747E307BF17_terseLabel_en-US" xlink:label="lab_ucbi_EquipmentFinancingMember_F28E98DED5F681817451F747E307BF17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equipment financing</link:label>
    <link:label id="lab_ucbi_EquipmentFinancingMember_F28E98DED5F681817451F747E307BF17_label_en-US" xlink:label="lab_ucbi_EquipmentFinancingMember_F28E98DED5F681817451F747E307BF17" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equipment Financing [Member]</link:label>
    <link:label id="lab_ucbi_EquipmentFinancingMember_F28E98DED5F681817451F747E307BF17_documentation_en-US" xlink:label="lab_ucbi_EquipmentFinancingMember_F28E98DED5F681817451F747E307BF17" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information related to equipment financing.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_EquipmentFinancingMember" xlink:label="loc_ucbi_EquipmentFinancingMember_F28E98DED5F681817451F747E307BF17" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_EquipmentFinancingMember_F28E98DED5F681817451F747E307BF17" xlink:to="lab_ucbi_EquipmentFinancingMember_F28E98DED5F681817451F747E307BF17" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_60ECAD5C915CAAF4ECFEF747E307B161_verboseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_60ECAD5C915CAAF4ECFEF747E307B161" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Financing Receivable, Past Due [Line Items]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_60ECAD5C915CAAF4ECFEF747E307B161_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_60ECAD5C915CAAF4ECFEF747E307B161" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Past Due [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_60ECAD5C915CAAF4ECFEF747E307B161" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_60ECAD5C915CAAF4ECFEF747E307B161" xlink:to="lab_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_60ECAD5C915CAAF4ECFEF747E307B161" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract_50B9525692C30BDADB29F747E3077AFA_verboseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract_50B9525692C30BDADB29F747E3077AFA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Recorded investment in nonaccrual loans by loan class</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract_50B9525692C30BDADB29F747E3077AFA_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract_50B9525692C30BDADB29F747E3077AFA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Recorded Investment, Aging [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract_50B9525692C30BDADB29F747E3077AFA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract_50B9525692C30BDADB29F747E3077AFA" xlink:to="lab_us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract_50B9525692C30BDADB29F747E3077AFA" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_6DBF22ED64D98916BAE3F747E307DDA1_verboseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_6DBF22ED64D98916BAE3F747E307DDA1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Nonaccrual Loans</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_6DBF22ED64D98916BAE3F747E307DDA1_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_6DBF22ED64D98916BAE3F747E307DDA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Nonaccrual</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_6DBF22ED64D98916BAE3F747E307DDA1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccountingPoliciesAbstract_FD4321E604E8B9D58565157BCD217BF2_label_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract_FD4321E604E8B9D58565157BCD217BF2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_FD4321E604E8B9D58565157BCD217BF2" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3667DBCC08AB5F55D378F747E321FC07" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3667DBCC08AB5F55D378F747E321FC07" xlink:to="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3667DBCC08AB5F55D378F747E321FC07" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071_terseLabel_en-US" xlink:label="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative liabilities - risk participations</link:label>
    <link:label id="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071_label_en-US" xlink:label="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liabilities Risk Participations [Member]</link:label>
    <link:label id="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071_documentation_en-US" xlink:label="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents derivative liabilities risk participations.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_DerivativeLiabilitiesRiskParticipationsMember" xlink:label="loc_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071" xlink:to="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4_terseLabel_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative liabilities - other</link:label>
    <link:label id="lab_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4_label_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability [Member]</link:label>
    <link:label id="lab_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4_documentation_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents Derivative Liability.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_DerivativeLiabilityMember" xlink:label="loc_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4" xlink:to="lab_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByAssetClassAxis_BF035902AD9B4E326777F747E32208FF_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis_BF035902AD9B4E326777F747E32208FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Class [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByAssetClassAxis_BF035902AD9B4E326777F747E32208FF_label_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis_BF035902AD9B4E326777F747E32208FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Class [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_BF035902AD9B4E326777F747E32208FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_BF035902AD9B4E326777F747E32208FF" xlink:to="lab_us-gaap_FairValueByAssetClassAxis_BF035902AD9B4E326777F747E32208FF" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_A90A6C0FAAB8EEBBB473F747E322AF74_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_A90A6C0FAAB8EEBBB473F747E322AF74" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Class [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_A90A6C0FAAB8EEBBB473F747E322AF74_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_A90A6C0FAAB8EEBBB473F747E322AF74" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Class [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_A90A6C0FAAB8EEBBB473F747E322AF74" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_A90A6C0FAAB8EEBBB473F747E322AF74" xlink:to="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_A90A6C0FAAB8EEBBB473F747E322AF74" xlink:type="arc" />
    <link:label id="lab_ucbi_SBAServicingRightsMember_588D5FF1CF8DF0A4FED0F747E322C838_terseLabel_en-US" xlink:label="lab_ucbi_SBAServicingRightsMember_588D5FF1CF8DF0A4FED0F747E322C838" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Servicing rights for SBA/USDA loans</link:label>
    <link:label id="lab_ucbi_SBAServicingRightsMember_588D5FF1CF8DF0A4FED0F747E322C838_label_en-US" xlink:label="lab_ucbi_SBAServicingRightsMember_588D5FF1CF8DF0A4FED0F747E322C838" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">SBA Servicing Rights [Member]</link:label>
    <link:label id="lab_ucbi_SBAServicingRightsMember_588D5FF1CF8DF0A4FED0F747E322C838_documentation_en-US" xlink:label="lab_ucbi_SBAServicingRightsMember_588D5FF1CF8DF0A4FED0F747E322C838" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents SBA servicing rights.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_SBAServicingRightsMember" xlink:label="loc_ucbi_SBAServicingRightsMember_588D5FF1CF8DF0A4FED0F747E322C838" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_SBAServicingRightsMember_588D5FF1CF8DF0A4FED0F747E322C838" xlink:to="lab_ucbi_SBAServicingRightsMember_588D5FF1CF8DF0A4FED0F747E322C838" xlink:type="arc" />
    <link:label id="lab_ucbi_ResidentialMortgageServicingRightsMember_8F0BA162192F2545D217F747E3235D61_verboseLabel_en-US" xlink:label="lab_ucbi_ResidentialMortgageServicingRightsMember_8F0BA162192F2545D217F747E3235D61" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage servicing rights</link:label>
    <link:label id="lab_ucbi_ResidentialMortgageServicingRightsMember_8F0BA162192F2545D217F747E3235D61_label_en-US" xlink:label="lab_ucbi_ResidentialMortgageServicingRightsMember_8F0BA162192F2545D217F747E3235D61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage Servicing Rights [Member]</link:label>
    <link:label id="lab_ucbi_ResidentialMortgageServicingRightsMember_8F0BA162192F2545D217F747E3235D61_documentation_en-US" xlink:label="lab_ucbi_ResidentialMortgageServicingRightsMember_8F0BA162192F2545D217F747E3235D61" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Residential Mortgage Servicing Rights [Member]</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_ResidentialMortgageServicingRightsMember" xlink:label="loc_ucbi_ResidentialMortgageServicingRightsMember_8F0BA162192F2545D217F747E3235D61" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_ResidentialMortgageServicingRightsMember_8F0BA162192F2545D217F747E3235D61" xlink:to="lab_ucbi_ResidentialMortgageServicingRightsMember_8F0BA162192F2545D217F747E3235D61" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A_terseLabel_en-US" xlink:label="lab_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative assets - mortgage</link:label>
    <link:label id="lab_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A_label_en-US" xlink:label="lab_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset [Member]</link:label>
    <link:label id="lab_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A_documentation_en-US" xlink:label="lab_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents Derivative Asset.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_DerivativeAssetMember" xlink:label="loc_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A" xlink:to="lab_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43_verboseLabel_en-US" xlink:label="lab_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivative assets - other</link:label>
    <link:label id="lab_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43_label_en-US" xlink:label="lab_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Assets Other [Member]</link:label>
    <link:label id="lab_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43_documentation_en-US" xlink:label="lab_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information about Derivative assets other.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_DerivativeAssetsOtherMember" xlink:label="loc_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43" xlink:to="lab_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43" xlink:type="arc" />
    <link:label id="lab_us-gaap_MeasurementInputTypeAxis_A1F2866BD9E0BD7E7B69F747E323D42F_terseLabel_en-US" xlink:label="lab_us-gaap_MeasurementInputTypeAxis_A1F2866BD9E0BD7E7B69F747E323D42F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Input Type [Axis]</link:label>
    <link:label id="lab_us-gaap_MeasurementInputTypeAxis_A1F2866BD9E0BD7E7B69F747E323D42F_label_en-US" xlink:label="lab_us-gaap_MeasurementInputTypeAxis_A1F2866BD9E0BD7E7B69F747E323D42F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Input Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MeasurementInputTypeAxis" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_A1F2866BD9E0BD7E7B69F747E323D42F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_A1F2866BD9E0BD7E7B69F747E323D42F" xlink:to="lab_us-gaap_MeasurementInputTypeAxis_A1F2866BD9E0BD7E7B69F747E323D42F" xlink:type="arc" />
    <link:label id="lab_us-gaap_MeasurementInputTypeDomain_90599E1DAEE3295DB12FF747E3240B90_terseLabel_en-US" xlink:label="lab_us-gaap_MeasurementInputTypeDomain_90599E1DAEE3295DB12FF747E3240B90" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Input Type [Domain]</link:label>
    <link:label id="lab_us-gaap_MeasurementInputTypeDomain_90599E1DAEE3295DB12FF747E3240B90_label_en-US" xlink:label="lab_us-gaap_MeasurementInputTypeDomain_90599E1DAEE3295DB12FF747E3240B90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Input Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MeasurementInputTypeDomain" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_90599E1DAEE3295DB12FF747E3240B90" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_90599E1DAEE3295DB12FF747E3240B90" xlink:to="lab_us-gaap_MeasurementInputTypeDomain_90599E1DAEE3295DB12FF747E3240B90" xlink:type="arc" />
    <link:label id="lab_us-gaap_MeasurementInputDiscountRateMember_BD31D46BB699D534F77FF747E3243EA3_terseLabel_en-US" xlink:label="lab_us-gaap_MeasurementInputDiscountRateMember_BD31D46BB699D534F77FF747E3243EA3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discount Rate</link:label>
    <link:label id="lab_us-gaap_MeasurementInputDiscountRateMember_BD31D46BB699D534F77FF747E3243EA3_label_en-US" xlink:label="lab_us-gaap_MeasurementInputDiscountRateMember_BD31D46BB699D534F77FF747E3243EA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Input, Discount Rate [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MeasurementInputDiscountRateMember" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_BD31D46BB699D534F77FF747E3243EA3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MeasurementInputDiscountRateMember_BD31D46BB699D534F77FF747E3243EA3" xlink:to="lab_us-gaap_MeasurementInputDiscountRateMember_BD31D46BB699D534F77FF747E3243EA3" xlink:type="arc" />
    <link:label id="lab_us-gaap_MeasurementInputPrepaymentRateMember_FEAFD99DFD3E1A426C5BF747E324DE6D_terseLabel_en-US" xlink:label="lab_us-gaap_MeasurementInputPrepaymentRateMember_FEAFD99DFD3E1A426C5BF747E324DE6D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepayment Rate</link:label>
    <link:label id="lab_us-gaap_MeasurementInputPrepaymentRateMember_FEAFD99DFD3E1A426C5BF747E324DE6D_label_en-US" xlink:label="lab_us-gaap_MeasurementInputPrepaymentRateMember_FEAFD99DFD3E1A426C5BF747E324DE6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Input, Prepayment Rate [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MeasurementInputPrepaymentRateMember" xlink:label="loc_us-gaap_MeasurementInputPrepaymentRateMember_FEAFD99DFD3E1A426C5BF747E324DE6D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MeasurementInputPrepaymentRateMember_FEAFD99DFD3E1A426C5BF747E324DE6D" xlink:to="lab_us-gaap_MeasurementInputPrepaymentRateMember_FEAFD99DFD3E1A426C5BF747E324DE6D" xlink:type="arc" />
    <link:label id="lab_ucbi_MeasurementInputPullThroughRateMember_4A2342FD38883CE4E6F0F747E324704A_terseLabel_en-US" xlink:label="lab_ucbi_MeasurementInputPullThroughRateMember_4A2342FD38883CE4E6F0F747E324704A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pull Through Rate</link:label>
    <link:label id="lab_ucbi_MeasurementInputPullThroughRateMember_4A2342FD38883CE4E6F0F747E324704A_label_en-US" xlink:label="lab_ucbi_MeasurementInputPullThroughRateMember_4A2342FD38883CE4E6F0F747E324704A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Input, Pull Through Rate [Member]</link:label>
    <link:label id="lab_ucbi_MeasurementInputPullThroughRateMember_4A2342FD38883CE4E6F0F747E324704A_documentation_en-US" xlink:label="lab_ucbi_MeasurementInputPullThroughRateMember_4A2342FD38883CE4E6F0F747E324704A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Measurement Input, Pull Through Rate [Member]</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_MeasurementInputPullThroughRateMember" xlink:label="loc_ucbi_MeasurementInputPullThroughRateMember_4A2342FD38883CE4E6F0F747E324704A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_MeasurementInputPullThroughRateMember_4A2342FD38883CE4E6F0F747E324704A" xlink:to="lab_ucbi_MeasurementInputPullThroughRateMember_4A2342FD38883CE4E6F0F747E324704A" xlink:type="arc" />
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    <link:label id="lab_us-gaap_InvestmentTypeCategorizationMember_31232F1130F07D42C7B05D69B4414AEA_label_en-US" xlink:label="lab_us-gaap_InvestmentTypeCategorizationMember_31232F1130F07D42C7B05D69B4414AEA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_31232F1130F07D42C7B05D69B4414AEA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_31232F1130F07D42C7B05D69B4414AEA" xlink:to="lab_us-gaap_InvestmentTypeCategorizationMember_31232F1130F07D42C7B05D69B4414AEA" xlink:type="arc" />
    <link:label id="lab_us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember_1F242A993AF50E8B25D85D69B441F8EB_verboseLabel_en-US" xlink:label="lab_us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember_1F242A993AF50E8B25D85D69B441F8EB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">FHLB</link:label>
    <link:label id="lab_us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember_1F242A993AF50E8B25D85D69B441F8EB_label_en-US" xlink:label="lab_us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember_1F242A993AF50E8B25D85D69B441F8EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember" xlink:label="loc_us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember_1F242A993AF50E8B25D85D69B441F8EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember_1F242A993AF50E8B25D85D69B441F8EB" xlink:to="lab_us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember_1F242A993AF50E8B25D85D69B441F8EB" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_4927574DBAD9133AB8165D69B443AA12_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_4927574DBAD9133AB8165D69B443AA12" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accounts, Notes, Loans and Financing Receivable [Line Items]</link:label>
    <link:label id="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_4927574DBAD9133AB8165D69B443AA12_label_en-US" xlink:label="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_4927574DBAD9133AB8165D69B443AA12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts, Notes, Loans and Financing Receivable [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_4927574DBAD9133AB8165D69B443AA12" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_4927574DBAD9133AB8165D69B443AA12" xlink:to="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_4927574DBAD9133AB8165D69B443AA12" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoansPledgedAsCollateral_0A84B618AB80D1B5345A5D69B44398C6_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansPledgedAsCollateral_0A84B618AB80D1B5345A5D69B44398C6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Pledged as collateral to secure FHLB advances</link:label>
    <link:label id="lab_us-gaap_LoansPledgedAsCollateral_0A84B618AB80D1B5345A5D69B44398C6_label_en-US" xlink:label="lab_us-gaap_LoansPledgedAsCollateral_0A84B618AB80D1B5345A5D69B44398C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans Pledged as Collateral</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LoansPledgedAsCollateral" xlink:label="loc_us-gaap_LoansPledgedAsCollateral_0A84B618AB80D1B5345A5D69B44398C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansPledgedAsCollateral_0A84B618AB80D1B5345A5D69B44398C6" xlink:to="lab_us-gaap_LoansPledgedAsCollateral_0A84B618AB80D1B5345A5D69B44398C6" xlink:type="arc" />
    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_2AB4CB91D955F17809C85D69B443F1F3_terseLabel_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_2AB4CB91D955F17809C85D69B443F1F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Carrying value of purchased credit impaired loans</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_2AB4CB91D955F17809C85D69B443F1F3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_2AB4CB91D955F17809C85D69B443F1F3" xlink:to="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_2AB4CB91D955F17809C85D69B443F1F3" xlink:type="arc" />
    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_952C11D7C973D87D33E05D69B4436D04_verboseLabel_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_952C11D7C973D87D33E05D69B4436D04" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Unpaid principal balance of purchased credit impaired ("PCI") loans</link:label>
    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_952C11D7C973D87D33E05D69B4436D04_label_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_952C11D7C973D87D33E05D69B4436D04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_952C11D7C973D87D33E05D69B4436D04" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_952C11D7C973D87D33E05D69B4436D04" xlink:to="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_952C11D7C973D87D33E05D69B4436D04" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums_A3D51FA667D728797BF25D69B4439F9E_verboseLabel_en-US" xlink:label="lab_us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums_A3D51FA667D728797BF25D69B4439F9E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Remaining accretable fair value mark on loans</link:label>
    <link:label id="lab_us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums_A3D51FA667D728797BF25D69B4439F9E_label_en-US" xlink:label="lab_us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums_A3D51FA667D728797BF25D69B4439F9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums" xlink:label="loc_us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums_A3D51FA667D728797BF25D69B4439F9E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetInvestmentInLease_F09A23A935E9C8177BAE5D69B4448564_terseLabel_en-US" xlink:label="lab_us-gaap_NetInvestmentInLease_F09A23A935E9C8177BAE5D69B4448564" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Investment in leases</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetInvestmentInLease" xlink:label="loc_us-gaap_NetInvestmentInLease_F09A23A935E9C8177BAE5D69B4448564" xlink:type="locator" />
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    <link:label id="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_3CDFE42C831ACFAC371C5D69B444398D_verboseLabel_en-US" xlink:label="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_3CDFE42C831ACFAC371C5D69B444398D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Criteria amount for evaluation of impairment</link:label>
    <link:label id="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_3CDFE42C831ACFAC371C5D69B444398D_label_en-US" xlink:label="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_3CDFE42C831ACFAC371C5D69B444398D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Amount Of Loan Evaluated For Impairment</link:label>
    <link:label id="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_3CDFE42C831ACFAC371C5D69B444398D_documentation_en-US" xlink:label="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_3CDFE42C831ACFAC371C5D69B444398D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents minimum amount of loan evaluated for impairment.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_MinimumAmountOfLoanEvaluatedForImpairment" xlink:label="loc_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_3CDFE42C831ACFAC371C5D69B444398D" xlink:type="locator" />
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    <link:label id="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_6D78880F46040BCBF4E85D69B44430BA_verboseLabel_en-US" xlink:label="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_6D78880F46040BCBF4E85D69B44430BA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Specific reserves</link:label>
    <link:label id="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_6D78880F46040BCBF4E85D69B44430BA_label_en-US" xlink:label="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_6D78880F46040BCBF4E85D69B44430BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Specific Reserves Allocated To Customers Whose Loan Terms Modified In Troubled Debt Restructurings</link:label>
    <link:label id="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_6D78880F46040BCBF4E85D69B44430BA_documentation_en-US" xlink:label="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_6D78880F46040BCBF4E85D69B44430BA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents specific reserves allocated to customers whose loan terms modified in troubled debt restructurings.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings" xlink:label="loc_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_6D78880F46040BCBF4E85D69B44430BA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_1330CD4EB78869385F895D69B4440E43_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_1330CD4EB78869385F895D69B4440E43" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Additional availability on loans classified as troubled debt restructurings</link:label>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_1330CD4EB78869385F895D69B4440E43_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_1330CD4EB78869385F895D69B4440E43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Troubled Debt Restructuring, Commitment to Lend</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend" xlink:label="loc_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_1330CD4EB78869385F895D69B4440E43" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_1330CD4EB78869385F895D69B4440E43" xlink:to="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_1330CD4EB78869385F895D69B4440E43" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_C903C85C987ECEAD02865D69B44451C9_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_C903C85C987ECEAD02865D69B44451C9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gross additional interest revenue that would have been earned if the nonaccrual loans had performed as per original terms</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_2A0B9FC32F98794FB178F8CC4C0E6304_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_2A0B9FC32F98794FB178F8CC4C0E6304" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Available-for-sale Securities [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_2A0B9FC32F98794FB178F8CC4C0E6304_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_2A0B9FC32F98794FB178F8CC4C0E6304" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Available-for-sale Securities [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_2A0B9FC32F98794FB178F8CC4C0E6304" xlink:type="locator" />
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    <link:label id="lab_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_8E0366F812F2B5D94757F8CC4C105310_verboseLabel_en-US" xlink:label="lab_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_8E0366F812F2B5D94757F8CC4C105310" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">U.S. Government agencies</link:label>
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    <link:label id="lab_ucbi_CommonStockIssuableShares_3E668938B54764977B7B115840834604_documentation_en-US" xlink:label="lab_ucbi_CommonStockIssuableShares_3E668938B54764977B7B115840834604" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents number of shares of common stock issuable.</link:label>
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    <link:label id="lab_us-gaap_AcquisitionRelatedCostsMember_EC75D21B274323DE860D729955772384_terseLabel_en-US" xlink:label="lab_us-gaap_AcquisitionRelatedCostsMember_EC75D21B274323DE860D729955772384" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Merger-related costs</link:label>
    <link:label id="lab_us-gaap_AcquisitionRelatedCostsMember_EC75D21B274323DE860D729955772384_label_en-US" xlink:label="lab_us-gaap_AcquisitionRelatedCostsMember_EC75D21B274323DE860D729955772384" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquisition-related Costs [Member]</link:label>
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    <link:label id="lab_us-gaap_CoreDepositsMember_F71E8F3817FFE782FCC47221784F8F31_terseLabel_en-US" xlink:label="lab_us-gaap_CoreDepositsMember_F71E8F3817FFE782FCC47221784F8F31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Core deposit intangible</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CoreDepositsMember" xlink:label="loc_us-gaap_CoreDepositsMember_F71E8F3817FFE782FCC47221784F8F31" xlink:type="locator" />
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    <link:label id="lab_ucbi_NLFCHoldingsCorpAcquisitionMember_133F21BD982EE6646AA77221785066AA_terseLabel_en-US" xlink:label="lab_ucbi_NLFCHoldingsCorpAcquisitionMember_133F21BD982EE6646AA77221785066AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Navitas</link:label>
    <link:label id="lab_ucbi_NLFCHoldingsCorpAcquisitionMember_133F21BD982EE6646AA77221785066AA_label_en-US" xlink:label="lab_ucbi_NLFCHoldingsCorpAcquisitionMember_133F21BD982EE6646AA77221785066AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NLFC Holdings Corp Acquisition [Member]</link:label>
    <link:label id="lab_ucbi_NLFCHoldingsCorpAcquisitionMember_133F21BD982EE6646AA77221785066AA_documentation_en-US" xlink:label="lab_ucbi_NLFCHoldingsCorpAcquisitionMember_133F21BD982EE6646AA77221785066AA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">NLFC Holdings Corp Acquisition [Member]</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_NLFCHoldingsCorpAcquisitionMember" xlink:label="loc_ucbi_NLFCHoldingsCorpAcquisitionMember_133F21BD982EE6646AA77221785066AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_NLFCHoldingsCorpAcquisitionMember_133F21BD982EE6646AA77221785066AA" xlink:to="lab_ucbi_NLFCHoldingsCorpAcquisitionMember_133F21BD982EE6646AA77221785066AA" xlink:type="arc" />
    <link:label id="lab_ucbi_NumberOfBranches_85952FE8B37B0CF22C77722178505AC0_terseLabel_en-US" xlink:label="lab_ucbi_NumberOfBranches_85952FE8B37B0CF22C77722178505AC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of banking offices</link:label>
    <link:label id="lab_ucbi_NumberOfBranches_85952FE8B37B0CF22C77722178505AC0_label_en-US" xlink:label="lab_ucbi_NumberOfBranches_85952FE8B37B0CF22C77722178505AC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Branches</link:label>
    <link:label id="lab_ucbi_NumberOfBranches_85952FE8B37B0CF22C77722178505AC0_documentation_en-US" xlink:label="lab_ucbi_NumberOfBranches_85952FE8B37B0CF22C77722178505AC0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents number of branches operated by entity.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_NumberOfBranches" xlink:label="loc_ucbi_NumberOfBranches_85952FE8B37B0CF22C77722178505AC0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_2442B94B999DA35FBFFD72217850CEB3_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_2442B94B999DA35FBFFD72217850CEB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets acquired</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesGross_90BA44A7E0ADAA883BE972217851A799_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesGross_90BA44A7E0ADAA883BE972217851A799" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash payments for acquisition</link:label>
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    <link:label id="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_495359B581A667C7BBFF722178510A98_terseLabel_en-US" xlink:label="lab_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_495359B581A667C7BBFF722178510A98" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected useful life of intangible assets (in years)</link:label>
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    <link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_4B25EA94D21FA7A33FE3F8CC4AE90184_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_4B25EA94D21FA7A33FE3F8CC4AE90184" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Text Block]</link:label>
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    <link:label id="lab_us-gaap_LeaseCostTableTextBlock_E8B32289533A0F09E7CAF747E48C1D33_label_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_E8B32289533A0F09E7CAF747E48C1D33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCostTableTextBlock" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_E8B32289533A0F09E7CAF747E48C1D33" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_C9341E6E38AC56CF5229F747E48C4F51_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_C9341E6E38AC56CF5229F747E48C4F51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of future minimum lease payments under operating leases</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_C9341E6E38AC56CF5229F747E48C4F51_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_C9341E6E38AC56CF5229F747E48C4F51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Maturity [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_C9341E6E38AC56CF5229F747E48C4F51" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_C9341E6E38AC56CF5229F747E48C4F51" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_C9341E6E38AC56CF5229F747E48C4F51" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_5FAE2811E513B4B5ADDBF747E56C612C_verboseLabel_en-US" xlink:label="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_5FAE2811E513B4B5ADDBF747E56C612C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts of recognized assets</link:label>
    <link:label id="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_5FAE2811E513B4B5ADDBF747E56C612C_label_en-US" xlink:label="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_5FAE2811E513B4B5ADDBF747E56C612C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Securities Purchased under Agreements to Resell, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_5FAE2811E513B4B5ADDBF747E56C612C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_5FAE2811E513B4B5ADDBF747E56C612C" xlink:to="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_5FAE2811E513B4B5ADDBF747E56C612C" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_D046B0BCEAD5703C3AFFF747E56D1C92_negatedLabel_en-US" xlink:label="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_D046B0BCEAD5703C3AFFF747E56D1C92" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts offset on the balance sheet</link:label>
    <link:label id="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_D046B0BCEAD5703C3AFFF747E56D1C92_label_en-US" xlink:label="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_D046B0BCEAD5703C3AFFF747E56D1C92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Securities Purchased under Agreements to Resell, Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_D046B0BCEAD5703C3AFFF747E56D1C92" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_D046B0BCEAD5703C3AFFF747E56D1C92" xlink:to="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_D046B0BCEAD5703C3AFFF747E56D1C92" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_3A93F08EF422673C6229F747E56DE222_totalLabel_en-US" xlink:label="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_3A93F08EF422673C6229F747E56DE222" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, net asset balance</link:label>
    <link:label id="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_3A93F08EF422673C6229F747E56DE222_label_en-US" xlink:label="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_3A93F08EF422673C6229F747E56DE222" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Securities Purchased under Agreements to Resell</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResell" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_3A93F08EF422673C6229F747E56DE222" xlink:type="locator" />
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    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_F82A47A53704D6D61AEDF747E56DC745_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_F82A47A53704D6D61AEDF747E56DC745" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts not offset in balance sheet assets of financial instruments</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_F82A47A53704D6D61AEDF747E56DC745_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_F82A47A53704D6D61AEDF747E56DC745" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repurchase And Reverse Repurchase Agreements Gross Amounts Not Off Set In Balance Sheet Assets Of Financial Instruments</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_F82A47A53704D6D61AEDF747E56DC745_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_F82A47A53704D6D61AEDF747E56DC745" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents amount of gross amounts not offset in the balance sheet assets related to repurchase and reverse repurchase agreements of financial instruments.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_F82A47A53704D6D61AEDF747E56DC745" xlink:type="locator" />
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    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_30FB96B99DB8580C7A37F747E56DAB25_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_30FB96B99DB8580C7A37F747E56DAB25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts not offset in balance sheet assets of collateral received</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_30FB96B99DB8580C7A37F747E56DAB25_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_30FB96B99DB8580C7A37F747E56DAB25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repurchase And Reverse Repurchase Agreements Gross Amounts Not Off Set In Balance Sheet Assets Of Collateral Received</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_30FB96B99DB8580C7A37F747E56DAB25_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_30FB96B99DB8580C7A37F747E56DAB25" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents amount of gross amounts not offset in the balance sheet assets related to repurchase and reverse repurchase agreements of collateral received.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_30FB96B99DB8580C7A37F747E56DAB25" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_30FB96B99DB8580C7A37F747E56DAB25" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_30FB96B99DB8580C7A37F747E56DAB25" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_E1186ADBE19CB23A49C2F747E56D3483_totalLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_E1186ADBE19CB23A49C2F747E56D3483" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, net amount</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_E1186ADBE19CB23A49C2F747E56D3483_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_E1186ADBE19CB23A49C2F747E56D3483" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repurchase And Reverse Repurchase Agreements Net Assets</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_E1186ADBE19CB23A49C2F747E56D3483_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetAssets_E1186ADBE19CB23A49C2F747E56D3483" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents amount of net assets related to repurchase and reverse repurchase agreements.</link:label>
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    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_DC66FC05B4BFD9BC235AF747E56EE265_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_DC66FC05B4BFD9BC235AF747E56EE265" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivatives, gross amounts of recognized assets</link:label>
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    <link:label id="lab_us-gaap_DerivativeAssetFairValueOfCollateral_A08EE6ED8921744A92B1F747E56EA906_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueOfCollateral_A08EE6ED8921744A92B1F747E56EA906" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Fair Value of Collateral</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetFairValueOfCollateral" xlink:label="loc_us-gaap_DerivativeAssetFairValueOfCollateral_A08EE6ED8921744A92B1F747E56EA906" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_FB8CEC6A5298EF2D08D3F747E56E6552_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_FB8CEC6A5298EF2D08D3F747E56E6552" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivatives, net amount</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_FB8CEC6A5298EF2D08D3F747E56E6552_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_FB8CEC6A5298EF2D08D3F747E56E6552" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_FB8CEC6A5298EF2D08D3F747E56E6552" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_89ACDE82AFE9A19685BBF747E56EE776_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_89ACDE82AFE9A19685BBF747E56EE776" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Offsetting assets, gross amounts of recognized assets</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_89ACDE82AFE9A19685BBF747E56EE776_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_89ACDE82AFE9A19685BBF747E56EE776" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross</link:label>
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_9CD0490A3F58C657911DF747E56F76BA_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_9CD0490A3F58C657911DF747E56F76BA" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Offsetting assets, net asset balance</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_9CD0490A3F58C657911DF747E56F76BA_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_9CD0490A3F58C657911DF747E56F76BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_9CD0490A3F58C657911DF747E56F76BA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_9CD0490A3F58C657911DF747E56F76BA" xlink:to="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_9CD0490A3F58C657911DF747E56F76BA" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_4487B9DCB8B6C7FF51D8F747E56FD954_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_4487B9DCB8B6C7FF51D8F747E56FD954" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Offsetting assets, gross amounts not offset in balance sheet of financial instruments</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_4487B9DCB8B6C7FF51D8F747E56FD954_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_4487B9DCB8B6C7FF51D8F747E56FD954" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Not Offset, Policy Election Deduction</link:label>
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral_C5C3AAA39AD02EF000BBF747E56F507B_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral_C5C3AAA39AD02EF000BBF747E56F507B" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Offsetting assets, gross amounts not offset in the balance sheet of collateral received</link:label>
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_144A072B4852D59BB68CF747E56F4D16_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_144A072B4852D59BB68CF747E56F4D16" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Offsetting assets, net amount</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_144A072B4852D59BB68CF747E56F4D16_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_144A072B4852D59BB68CF747E56F4D16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_144A072B4852D59BB68CF747E56F4D16" xlink:to="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_144A072B4852D59BB68CF747E56F4D16" xlink:type="arc" />
    <link:label id="lab_ucbi_WeightedAverageInterestRateOfReverseRepurchaseAgreementsAssets_89E7FE7256263C5F2986F747E56FF7FB_verboseLabel_en-US" xlink:label="lab_ucbi_WeightedAverageInterestRateOfReverseRepurchaseAgreementsAssets_89E7FE7256263C5F2986F747E56FF7FB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average interest rate of reverse repurchase agreements, assets (percent)</link:label>
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    <link:label id="lab_ucbi_WeightedAverageInterestRateOfReverseRepurchaseAgreementsAssets_89E7FE7256263C5F2986F747E56FF7FB_documentation_en-US" xlink:label="lab_ucbi_WeightedAverageInterestRateOfReverseRepurchaseAgreementsAssets_89E7FE7256263C5F2986F747E56FF7FB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents percentage of weighted average interest rate of reverse repurchase agreements related to assets.</link:label>
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    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_62886469BC5C07B73B3DF747E5702AC5_verboseLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_62886469BC5C07B73B3DF747E5702AC5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts of recognized liabilities</link:label>
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    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_8C2B4F917E4E9C8B3F66F747E570F884_negatedLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_8C2B4F917E4E9C8B3F66F747E570F884" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts offset on balance sheet</link:label>
    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_8C2B4F917E4E9C8B3F66F747E570F884_label_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_8C2B4F917E4E9C8B3F66F747E570F884" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Securities Sold under Agreements to Repurchase, Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_8C2B4F917E4E9C8B3F66F747E570F884" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_8C2B4F917E4E9C8B3F66F747E570F884" xlink:to="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_8C2B4F917E4E9C8B3F66F747E570F884" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_5FA3AF8850AE3EBDD573F747E57021B7_totalLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_5FA3AF8850AE3EBDD573F747E57021B7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, net liability balance</link:label>
    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_5FA3AF8850AE3EBDD573F747E57021B7_label_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_5FA3AF8850AE3EBDD573F747E57021B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Securities Sold under Agreements to Repurchase</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_5FA3AF8850AE3EBDD573F747E57021B7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_5FA3AF8850AE3EBDD573F747E57021B7" xlink:to="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_5FA3AF8850AE3EBDD573F747E57021B7" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5C98991142D91D5EF6D2F747E5705E37_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5C98991142D91D5EF6D2F747E5705E37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts not offset in balance sheet liabilities of financial instruments</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5C98991142D91D5EF6D2F747E5705E37_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5C98991142D91D5EF6D2F747E5705E37" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repurchase And Reverse Repurchase Agreements Gross Amounts Not Off Set In Balance Sheet Liabilities Of Financial Instruments</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5C98991142D91D5EF6D2F747E5705E37_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5C98991142D91D5EF6D2F747E5705E37" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents amount of gross amounts not offset in the balance sheet liabilities related to repurchase and reverse repurchase agreements of financial instruments.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5C98991142D91D5EF6D2F747E5705E37" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5C98991142D91D5EF6D2F747E5705E37" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5C98991142D91D5EF6D2F747E5705E37" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_570402E5D59FD5E60E6DF747E5700BDD_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_570402E5D59FD5E60E6DF747E5700BDD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts not offset in balance sheet liabilities of collateral pledged</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_570402E5D59FD5E60E6DF747E5700BDD_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_570402E5D59FD5E60E6DF747E5700BDD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repurchase And Reverse Repurchase Agreements Gross Amounts Not Off Set In Balance Sheet Liabilities Of Collateral Pledged</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_570402E5D59FD5E60E6DF747E5700BDD_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_570402E5D59FD5E60E6DF747E5700BDD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents amount of gross amounts not offset in the balance sheet liabilities related to repurchase and reverse repurchase agreements of collateral pledged.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_570402E5D59FD5E60E6DF747E5700BDD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_570402E5D59FD5E60E6DF747E5700BDD" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_570402E5D59FD5E60E6DF747E5700BDD" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_F9F091E16046AA05CEA8F747E570846B_totalLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_F9F091E16046AA05CEA8F747E570846B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, net amount</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_F9F091E16046AA05CEA8F747E570846B_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_F9F091E16046AA05CEA8F747E570846B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repurchase And Reverse Repurchase Agreements Net Liabilities</link:label>
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_F9F091E16046AA05CEA8F747E570846B_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_F9F091E16046AA05CEA8F747E570846B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents amount of net liabilities related to repurchase and reverse repurchase agreements.</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_F9F091E16046AA05CEA8F747E570846B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_F9F091E16046AA05CEA8F747E570846B" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_F9F091E16046AA05CEA8F747E570846B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_56DCCD847C11EC92D3FEF747E570DB35_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_56DCCD847C11EC92D3FEF747E570DB35" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivatives, gross amounts of recognized liabilities</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_56DCCD847C11EC92D3FEF747E570DB35_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_56DCCD847C11EC92D3FEF747E570DB35" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Gross Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_56DCCD847C11EC92D3FEF747E570DB35" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_56DCCD847C11EC92D3FEF747E570DB35" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_56DCCD847C11EC92D3FEF747E570DB35" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_31218A97749BF37E908EF747E571F93C_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_31218A97749BF37E908EF747E571F93C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivatives, gross amounts offset on balance sheet</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_31218A97749BF37E908EF747E571F93C_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_31218A97749BF37E908EF747E571F93C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Amount Offset Against Collateral</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_31218A97749BF37E908EF747E571F93C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_31218A97749BF37E908EF747E571F93C" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_31218A97749BF37E908EF747E571F93C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_DC9F76DDC6490F6EF478F747E571F0DD_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_DC9F76DDC6490F6EF478F747E571F0DD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivatives, net liability balance</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_DC9F76DDC6490F6EF478F747E571F0DD_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_DC9F76DDC6490F6EF478F747E571F0DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Amount Not Offset Against Collateral</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_DC9F76DDC6490F6EF478F747E571F0DD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_DC9F76DDC6490F6EF478F747E571F0DD" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_DC9F76DDC6490F6EF478F747E571F0DD" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_662837B89A9E75070C7FF747E5715E2C_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_662837B89A9E75070C7FF747E5715E2C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Derivatives, gross amounts not offset in balance sheet liabilities of financial instruments</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_662837B89A9E75070C7FF747E5715E2C_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_662837B89A9E75070C7FF747E5715E2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Not Offset, Policy Election Deduction</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction" xlink:label="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_662837B89A9E75070C7FF747E5715E2C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_662837B89A9E75070C7FF747E5715E2C" xlink:to="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_662837B89A9E75070C7FF747E5715E2C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_EB37A2573045F81F3B3EF747E571A31C_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_EB37A2573045F81F3B3EF747E571A31C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Derivatives, gross amounts not offset in balance sheet liabilities of collateral pledged</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_EB37A2573045F81F3B3EF747E571A31C_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_EB37A2573045F81F3B3EF747E571A31C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value of Collateral</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOfCollateral" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_EB37A2573045F81F3B3EF747E571A31C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_EB37A2573045F81F3B3EF747E571A31C" xlink:to="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_EB37A2573045F81F3B3EF747E571A31C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1333071AF044EB327239F747E5719692_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1333071AF044EB327239F747E5719692" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivatives, net amount</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1333071AF044EB327239F747E5719692_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1333071AF044EB327239F747E5719692" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1333071AF044EB327239F747E5719692" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1333071AF044EB327239F747E5719692" xlink:to="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_1333071AF044EB327239F747E5719692" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_0BE5388054C07F903D40F747E571A608_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_0BE5388054C07F903D40F747E571A608" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Offsetting liabilities, gross amounts of recognized liabilities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_0BE5388054C07F903D40F747E571A608" xlink:type="locator" />
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    <link:label id="lab_ucbi_CommonStocksIssuable_9F59F59983B947C21D565D69B5121FF0_verboseLabel_en-US" xlink:label="lab_ucbi_CommonStocksIssuable_9F59F59983B947C21D565D69B5121FF0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock issuable; 641,725 and 674,499 shares</link:label>
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    <link:label id="lab_us-gaap_AdditionalPaidInCapital_6C2B58EA59EEBCA54E5F5D69B512EA2A_verboseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapital_6C2B58EA59EEBCA54E5F5D69B512EA2A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Capital surplus</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_FFEC64517D8E69E59656F747E19C5BE6" xlink:type="locator" />
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    <link:label id="lab_ucbi_RiskCategoryOfLoansByClassOfLoansAbstract_1F9AE09CD90D0F062B65F747E19CA705_verboseLabel_en-US" xlink:label="lab_ucbi_RiskCategoryOfLoansByClassOfLoansAbstract_1F9AE09CD90D0F062B65F747E19CA705" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Risk category of loans by class of loans</link:label>
    <link:label id="lab_ucbi_RiskCategoryOfLoansByClassOfLoansAbstract_1F9AE09CD90D0F062B65F747E19CA705_label_en-US" xlink:label="lab_ucbi_RiskCategoryOfLoansByClassOfLoansAbstract_1F9AE09CD90D0F062B65F747E19CA705" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Risk Category Of Loans By Class Of Loans [Abstract]</link:label>
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    <link:label id="lab_ucbi_LoansAndLeasesReceivableExcludingPurchasedCreditImpairedLoans_18A0341E557E854B6692F747E19C9E3A_verboseLabel_en-US" xlink:label="lab_ucbi_LoansAndLeasesReceivableExcludingPurchasedCreditImpairedLoans_18A0341E557E854B6692F747E19C9E3A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total loans, excluding PCI loans</link:label>
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    <link:label id="lab_ucbi_LoansAndLeasesReceivableExcludingPurchasedCreditImpairedLoans_18A0341E557E854B6692F747E19C9E3A_documentation_en-US" xlink:label="lab_ucbi_LoansAndLeasesReceivableExcludingPurchasedCreditImpairedLoans_18A0341E557E854B6692F747E19C9E3A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents loans and leases receivable excluding purchased credit impaired loans.</link:label>
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    <link:label id="lab_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_84F9D5F8EE9A003471E5F747E19D6E1D_terseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_84F9D5F8EE9A003471E5F747E19D6E1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total loans</link:label>
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    <link:label id="lab_us-gaap_LesseeOperatingLeasesTextBlock_191A8C01FD5CA36FE7DFF8CC4A991479_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeasesTextBlock_191A8C01FD5CA36FE7DFF8CC4A991479" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leases</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeasesTextBlock_191A8C01FD5CA36FE7DFF8CC4A991479_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeasesTextBlock_191A8C01FD5CA36FE7DFF8CC4A991479" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Leases [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeasesTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeasesTextBlock_191A8C01FD5CA36FE7DFF8CC4A991479" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAbstract_AFDDED71D04481145A7F5D69B4B5AA0B_terseLabel_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAbstract_AFDDED71D04481145A7F5D69B4B5AA0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounted for pursuant to ASC 310-30:</link:label>
    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAbstract_AFDDED71D04481145A7F5D69B4B5AA0B_label_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAbstract_AFDDED71D04481145A7F5D69B4B5AA0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Certain Loans Acquired in Transfer Accounted for as Held-to-maturity Debt Securities, Acquired During Period [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAbstract" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAbstract_AFDDED71D04481145A7F5D69B4B5AA0B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAbstract_AFDDED71D04481145A7F5D69B4B5AA0B" xlink:to="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAbstract_AFDDED71D04481145A7F5D69B4B5AA0B" xlink:type="arc" />
    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition_7AEBFFCB7B47C1B96C285D69B4B50B24_verboseLabel_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition_7AEBFFCB7B47C1B96C285D69B4B50B24" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Contractually required principal and interest</link:label>
    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition_7AEBFFCB7B47C1B96C285D69B4B50B24_label_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition_7AEBFFCB7B47C1B96C285D69B4B50B24" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Certain Loans Acquired in Transfer Accounted for as Held-to-maturity Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition_7AEBFFCB7B47C1B96C285D69B4B50B24" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference_BDEADBA501640A14FDF05D69B4B588E1_verboseLabel_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference_BDEADBA501640A14FDF05D69B4B588E1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Non-accretable difference</link:label>
    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference_BDEADBA501640A14FDF05D69B4B588E1_label_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference_BDEADBA501640A14FDF05D69B4B588E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Certain Loans Acquired in Transfer, Nonaccretable Difference</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference" xlink:label="loc_us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference_BDEADBA501640A14FDF05D69B4B588E1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition_2487E67448ECEE6AE3CF5D69B4B59BAE_totalLabel_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition_2487E67448ECEE6AE3CF5D69B4B59BAE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Cash flows expected to be collected</link:label>
    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition_2487E67448ECEE6AE3CF5D69B4B59BAE_label_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition_2487E67448ECEE6AE3CF5D69B4B59BAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Certain Loans Acquired in Transfer Accounted for as Held-to-maturity Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition</link:label>
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    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferAccretableYield_7C110EC2F6FF69D43EDA5D69B4B5AE71_label_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferAccretableYield_7C110EC2F6FF69D43EDA5D69B4B5AE71" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Certain Loans Acquired in Transfer, Accretable Yield</link:label>
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    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue_7B97CB0C3F38E503048F5D69B4B575A0_label_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue_7B97CB0C3F38E503048F5D69B4B575A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Certain Loans Acquired in Transfer Accounted for as Held-to-maturity Debt Securities, Acquired During Period, at Acquisition, at Fair Value</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_C42465A45FB80DB5EE04F8C9CE54F859_label_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_C42465A45FB80DB5EE04F8C9CE54F859" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income Loss Amortization Of Losses Included In Net Income On Terminated Derivative Financial Instruments Which Previously Accounted For As Cash Flow Hedges Before Tax</link:label>
    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_C42465A45FB80DB5EE04F8C9CE54F859_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_C42465A45FB80DB5EE04F8C9CE54F859" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount before tax related to amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges.</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_3B62412BA3FC008CF738F8C9CE544763_negatedTerseLabel_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_3B62412BA3FC008CF738F8C9CE544763" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges, Tax (Expense) Benefit</link:label>
    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_3B62412BA3FC008CF738F8C9CE544763_label_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_3B62412BA3FC008CF738F8C9CE544763" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income Loss Amortization Of Losses Included In Net Income On Terminated Derivative Financial Instruments Which Previously Accounted For As Cash Flow Hedges Tax</link:label>
    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_3B62412BA3FC008CF738F8C9CE544763_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_3B62412BA3FC008CF738F8C9CE544763" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of tax expense (benefit) related to amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges.</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_FC9DE6D1AF83133F321FF8C9CE54205E_totalLabel_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_FC9DE6D1AF83133F321FF8C9CE54205E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges, After-tax Amount</link:label>
    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_FC9DE6D1AF83133F321FF8C9CE54205E_label_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_FC9DE6D1AF83133F321FF8C9CE54205E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income Loss Amortization Of Losses Included In Net Income On Terminated Derivative Financial Instruments Which Previously Accounted For As Cash Flow Hedges Net Of Tax</link:label>
    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_FC9DE6D1AF83133F321FF8C9CE54205E_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_FC9DE6D1AF83133F321FF8C9CE54205E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount after tax related to amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges.</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_79C1430200D2297832ECF8C9CE5411E4_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_79C1430200D2297832ECF8C9CE5411E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Defined benefit pension plan activity:</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_79C1430200D2297832ECF8C9CE5411E4" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_79C1430200D2297832ECF8C9CE5411E4" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_7DDE98300347F940BF32F8C9CE54A979_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_7DDE98300347F940BF32F8C9CE54A979" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net actuarial loss on defined benefit pension plan, Before-tax Amount</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_7DDE98300347F940BF32F8C9CE54A979" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_70FAAB9DE53E7C8590E6F8C9CE542279_negatedLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_70FAAB9DE53E7C8590E6F8C9CE542279" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net actuarial loss on defined benefit pension plan, Tax (Expense) Benefit</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_70FAAB9DE53E7C8590E6F8C9CE542279_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_70FAAB9DE53E7C8590E6F8C9CE542279" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_70FAAB9DE53E7C8590E6F8C9CE542279" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax_70FAAB9DE53E7C8590E6F8C9CE542279" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_79B0F82D7E5990C3A606F8C9CE54B6EE_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_79B0F82D7E5990C3A606F8C9CE54B6EE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net actuarial loss on defined benefit pension plan, Net of Tax Amount</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_79B0F82D7E5990C3A606F8C9CE54B6EE_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_79B0F82D7E5990C3A606F8C9CE54B6EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_81ED624E6ADA4F1FE7C1F8C9CE54F04C_verboseLabel_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_81ED624E6ADA4F1FE7C1F8C9CE54F04C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, Before-tax Amount</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_81ED624E6ADA4F1FE7C1F8C9CE54F04C_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanBeforeTaxAmount_81ED624E6ADA4F1FE7C1F8C9CE54F04C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of other comprehensive income (loss) amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, before tax amount.</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_61CE609C87BDF6587FF2F8C9CE541714_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_61CE609C87BDF6587FF2F8C9CE541714" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of other comprehensive income (loss) amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, tax expense benefit.</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_78D5A2186069970E6D48F8C9CE542D7F_totalLabel_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_78D5A2186069970E6D48F8C9CE542D7F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, Net of Tax Amount</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_78D5A2186069970E6D48F8C9CE542D7F_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_78D5A2186069970E6D48F8C9CE542D7F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other comprehensive income amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, net of tax.</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_21D113BB8CD06FDC31F2F8C9CE5465F2_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_21D113BB8CD06FDC31F2F8C9CE5465F2" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Net defined benefit pension plan activity, Before-tax Amount</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_21D113BB8CD06FDC31F2F8C9CE5465F2_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_21D113BB8CD06FDC31F2F8C9CE5465F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_21D113BB8CD06FDC31F2F8C9CE5465F2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_21D113BB8CD06FDC31F2F8C9CE5465F2" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_21D113BB8CD06FDC31F2F8C9CE5465F2" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_281544F1F4D3A8C371CAF8C9CE54B28D_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_281544F1F4D3A8C371CAF8C9CE54B28D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net defined benefit pension plan activity, Tax (Expense) Benefit</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_281544F1F4D3A8C371CAF8C9CE54B28D_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_281544F1F4D3A8C371CAF8C9CE54B28D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_281544F1F4D3A8C371CAF8C9CE54B28D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_281544F1F4D3A8C371CAF8C9CE54B28D" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_281544F1F4D3A8C371CAF8C9CE54B28D" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_BDABC61CE8BE7F19C00BF8C9CE54454A_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_BDABC61CE8BE7F19C00BF8C9CE54454A" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Net defined benefit pension plan activity, Net of Tax Amount</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_BDABC61CE8BE7F19C00BF8C9CE54454A_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_BDABC61CE8BE7F19C00BF8C9CE54454A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_BDABC61CE8BE7F19C00BF8C9CE54454A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_BDABC61CE8BE7F19C00BF8C9CE54454A" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_BDABC61CE8BE7F19C00BF8C9CE54454A" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_24B4D51C481E88643C60F8C9CE547553_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_24B4D51C481E88643C60F8C9CE547553" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total other comprehensive income (loss), Before-tax Amount</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_24B4D51C481E88643C60F8C9CE547553_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_24B4D51C481E88643C60F8C9CE547553" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_9EFF49566694B32EBD83F8C9CE549D43_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_9EFF49566694B32EBD83F8C9CE549D43" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total other comprehensive income (loss), Tax (Expense) Benefit</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_9EFF49566694B32EBD83F8C9CE549D43_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_9EFF49566694B32EBD83F8C9CE549D43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_C7F5C0FFBAD6F4744371F8C9CE541FE5_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_C7F5C0FFBAD6F4744371F8C9CE541FE5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total other comprehensive income (loss), net of tax amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_C7F5C0FFBAD6F4744371F8C9CE541FE5" xlink:type="locator" />
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    <link:label id="lab_ucbi_ComprehensiveIncomeLossBeforeTax_DF8DDBE036F022D91C0EF8C9CE54DECF_totalLabel_en-US" xlink:label="lab_ucbi_ComprehensiveIncomeLossBeforeTax_DF8DDBE036F022D91C0EF8C9CE54DECF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive income, Before-tax Amount</link:label>
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    <link:label id="lab_ucbi_ComprehensiveIncomeLossBeforeTax_DF8DDBE036F022D91C0EF8C9CE54DECF_documentation_en-US" xlink:label="lab_ucbi_ComprehensiveIncomeLossBeforeTax_DF8DDBE036F022D91C0EF8C9CE54DECF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of comprehensive income (loss) before tax.</link:label>
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    <link:label id="lab_ucbi_ComprehensiveIncomeLossTax_5C48B9795B8B7060420FF8C9CE54867B_negatedTotalLabel_en-US" xlink:label="lab_ucbi_ComprehensiveIncomeLossTax_5C48B9795B8B7060420FF8C9CE54867B" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive income, Tax (Expense) Benefit</link:label>
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    <link:label id="lab_ucbi_ComprehensiveIncomeLossTax_5C48B9795B8B7060420FF8C9CE54867B_documentation_en-US" xlink:label="lab_ucbi_ComprehensiveIncomeLossTax_5C48B9795B8B7060420FF8C9CE54867B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of comprehensive income loss tax.</link:label>
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    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_E7F29CB17D934DFA7205F8C9CE546221_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_E7F29CB17D934DFA7205F8C9CE546221" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive income, Net of Tax Amount</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_28FC8C0F387B89B91744F747E46317C6_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_28FC8C0F387B89B91744F747E46317C6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of stock option activity</link:label>
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    <link:label id="lab_us-gaap_InterestIncomeSecuritiesTaxExempt_F22F39228ADC1CD5E0BF115840DE9862_label_en-US" xlink:label="lab_us-gaap_InterestIncomeSecuritiesTaxExempt_F22F39228ADC1CD5E0BF115840DE9862" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Income, Securities, Operating, Tax Exempt</link:label>
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    <link:label id="lab_ucbi_StockIssuedDuringPeriodSharesDividendReinvestmentPlanAndEmployeeBenefitPlans_FB78742D48DD6EB8AC8D7221788005DF_documentation_en-US" xlink:label="lab_ucbi_StockIssuedDuringPeriodSharesDividendReinvestmentPlanAndEmployeeBenefitPlans_FB78742D48DD6EB8AC8D7221788005DF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents number of common stock issued to dividend reinvestment plan and employee benefit plans.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_C9F6A5094B0AF9C2F55872217881E84B" xlink:type="locator" />
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    <link:label id="lab_ucbi_VestingOfRestrictedStockSharesDeferred_B98A984D8C91116FFEBA72217881F62B_documentation_en-US" xlink:label="lab_ucbi_VestingOfRestrictedStockSharesDeferred_B98A984D8C91116FFEBA72217881F62B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents value of common stock issued to dividend reinvestment plan and employee benefit plans.</link:label>
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    <link:label id="lab_ucbi_DerivativeLiabilityMember_AADF6580E30909C95B65511E201BA99A_verboseLabel_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_AADF6580E30909C95B65511E201BA99A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liability</link:label>
    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_DerivativeLiabilityMember" xlink:label="loc_ucbi_DerivativeLiabilityMember_AADF6580E30909C95B65511E201BA99A" xlink:type="locator" />
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    <link:loc xlink:href="ucbi-20190630.xsd#ucbi_DerivativeAssetMember" xlink:label="loc_ucbi_DerivativeAssetMember_FF9F2E093E8DC82DE7BC511E201C24F9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AvailableforsaleSecuritiesMember_595B253D8BCE92DB38D0511E201DC7DF_verboseLabel_en-US" xlink:label="lab_us-gaap_AvailableforsaleSecuritiesMember_595B253D8BCE92DB38D0511E201DC7DF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Debt Securities Available-for-Sale</link:label>
    <link:label id="lab_us-gaap_AvailableforsaleSecuritiesMember_595B253D8BCE92DB38D0511E201DC7DF_label_en-US" xlink:label="lab_us-gaap_AvailableforsaleSecuritiesMember_595B253D8BCE92DB38D0511E201DC7DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities [Member]</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_5A02E53B81E385BA3721722178765269_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_5A02E53B81E385BA3721722178765269" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from exercise of stock options</link:label>
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    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_3FEFB64E0A9C88EDF6BB72217876112C_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_3FEFB64E0A9C88EDF6BB72217876112C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Cash paid for shares withheld to cover payroll taxes upon vesting of restricted stock</link:label>
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    <link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_D24075C30E0B1CCA379672217876C103_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_D24075C30E0B1CCA379672217876C103" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Cash dividends on common stock</link:label>
    <link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_D24075C30E0B1CCA379672217876C103_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_D24075C30E0B1CCA379672217876C103" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of Ordinary Dividends, Common Stock</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_365D4807FD2B6B807194722178764869_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_365D4807FD2B6B807194722178764869" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash (used in) provided by financing activities</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_A64A9CEC408B6E5EE4C5722178768B23_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_A64A9CEC408B6E5EE4C5722178768B23" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net change in cash and cash equivalents, including restricted cash</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_B0F6961D87AFD05DA052722178764925_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_B0F6961D87AFD05DA052722178764925" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents, including restricted cash, at beginning of period</link:label>
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    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_BB6DBCD7794A87B5C4B372217877DBAA_verboseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_BB6DBCD7794A87B5C4B372217877DBAA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Supplemental disclosures of cash flow information:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_BB6DBCD7794A87B5C4B372217877DBAA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_80D60ABAACF34523F15972217877674C_verboseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_80D60ABAACF34523F15972217877674C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Significant non-cash investing and financing transactions:</link:label>
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    <link:label id="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_DD789A8EAFC27860527472217877127A_verboseLabel_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_DD789A8EAFC27860527472217877127A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Unsettled government guaranteed loan sales</link:label>
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    <link:label id="lab_us-gaap_TransferToOtherRealEstate_06FDD5A3820A8B64EA5072217877CF83_verboseLabel_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_06FDD5A3820A8B64EA5072217877CF83" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Transfers of loans to foreclosed properties</link:label>
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