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    <link:label id="lab_ucbi_CommercialAndIndustrialClassificationMember_87246D8FA49A68FD3479F747E4F8FC76_terseLabel_en-US" xlink:label="lab_ucbi_CommercialAndIndustrialClassificationMember_C6FEBEE5C4CB59B18BFA3006A6ACD190" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial &amp; industrial</link:label>
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    <link:label id="lab_us-gaap_ConstructionLoansMember_B2B59EC6CF9DFF85AE90F747E4F978CE_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionLoansMember_D4CCD86DBDD55636AD7022E8DDBF1E65" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction</link:label>
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    <link:label id="lab_ucbi_EquipmentFinancingMember_0A1ADB5830E22F0D378AF747E4F987E1_documentation_en-US" xlink:label="lab_ucbi_EquipmentFinancingMember_FE7FCF88DB1A5CC0AF15281CC480ECBC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information related to equipment financing.</link:label>
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    <link:label id="lab_us-gaap_ResidentialMortgageMember_F082D337380B2ED09C25F747E4F96BD5_verboseLabel_en-US" xlink:label="lab_us-gaap_ResidentialMortgageMember_407297C9A1B0532E985E67F8ABDDA5EC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage</link:label>
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    <link:label id="lab_us-gaap_HomeEquityMember_C3E79703BBD19CD6D6A8F747E4F990D1_verboseLabel_en-US" xlink:label="lab_us-gaap_HomeEquityMember_17D7655ED775565A9B38290C1D0F00BF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Home equity lines of credit</link:label>
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    <link:label id="lab_us-gaap_AutomobileLoanMember_9499129C217FE6B50E97F747E4F91C6F_verboseLabel_en-US" xlink:label="lab_us-gaap_AutomobileLoanMember_CFA7E6B6023B5AC49DDF631F3EF10E72" 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_9499129C217FE6B50E97F747E4F91C6F_label_en-US" xlink:label="lab_us-gaap_AutomobileLoanMember_CFA7E6B6023B5AC49DDF631F3EF10E72" 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_CFA7E6B6023B5AC49DDF631F3EF10E72" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_285D427D30B2C261FFBE42AB12FF0E10_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_285D427D30B2C261FFBE42AB12FF0E10" 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>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_285D427D30B2C261FFBE42AB12FF0E10_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_285D427D30B2C261FFBE42AB12FF0E10" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_285D427D30B2C261FFBE42AB12FF0E10" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_285D427D30B2C261FFBE42AB12FF0E10" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_285D427D30B2C261FFBE42AB12FF0E10" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_75AAD8AEE5B93FB219FA42AB12FF4D30_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_75AAD8AEE5B93FB219FA42AB12FF4D30" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents, including restricted cash, at end of period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_75AAD8AEE5B93FB219FA42AB12FF4D30" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_75AAD8AEE5B93FB219FA42AB12FF4D30" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_75AAD8AEE5B93FB219FA42AB12FF4D30" xlink:type="arc" />
    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_DF90ED7DDDDCA03D2CEB42AB12FF4EBA_verboseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_DF90ED7DDDDCA03D2CEB42AB12FF4EBA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Supplemental disclosures of cash flow information:</link:label>
    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_DF90ED7DDDDCA03D2CEB42AB12FF4EBA_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_DF90ED7DDDDCA03D2CEB42AB12FF4EBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</link:label>
    <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_DF90ED7DDDDCA03D2CEB42AB12FF4EBA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_DF90ED7DDDDCA03D2CEB42AB12FF4EBA" xlink:to="lab_us-gaap_SupplementalCashFlowInformationAbstract_DF90ED7DDDDCA03D2CEB42AB12FF4EBA" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_2C5D52714AAFAEA38CBA42AB12FFB3D4_verboseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_2C5D52714AAFAEA38CBA42AB12FFB3D4" 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>
    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_2C5D52714AAFAEA38CBA42AB12FFB3D4_label_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_2C5D52714AAFAEA38CBA42AB12FFB3D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_2C5D52714AAFAEA38CBA42AB12FFB3D4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_2C5D52714AAFAEA38CBA42AB12FFB3D4" xlink:to="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_2C5D52714AAFAEA38CBA42AB12FFB3D4" xlink:type="arc" />
    <link:label id="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_8334D2083E6CE2A3EC1342AB12FF411A_verboseLabel_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_8334D2083E6CE2A3EC1342AB12FF411A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Unsettled government guaranteed loan sales</link:label>
    <link:label id="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_8334D2083E6CE2A3EC1342AB12FF411A_label_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_8334D2083E6CE2A3EC1342AB12FF411A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsettled Government Guaranteed Loan Sales</link:label>
    <link:label id="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_8334D2083E6CE2A3EC1342AB12FF411A_documentation_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_8334D2083E6CE2A3EC1342AB12FF411A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents unsettled government guaranteed loan sale.</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_UnsettledGovernmentGuaranteedLoanSales" xlink:label="loc_ucbi_UnsettledGovernmentGuaranteedLoanSales_8334D2083E6CE2A3EC1342AB12FF411A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_UnsettledGovernmentGuaranteedLoanSales_8334D2083E6CE2A3EC1342AB12FF411A" xlink:to="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_8334D2083E6CE2A3EC1342AB12FF411A" xlink:type="arc" />
    <link:label id="lab_us-gaap_TransferToOtherRealEstate_BC378EE7D43820282C3642AB130038E4_verboseLabel_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_BC378EE7D43820282C3642AB130038E4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Transfers of loans to foreclosed properties</link:label>
    <link:label id="lab_us-gaap_TransferToOtherRealEstate_BC378EE7D43820282C3642AB130038E4_label_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_BC378EE7D43820282C3642AB130038E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Owned, Transfer to Real Estate Owned</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransferToOtherRealEstate" xlink:label="loc_us-gaap_TransferToOtherRealEstate_BC378EE7D43820282C3642AB130038E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TransferToOtherRealEstate_BC378EE7D43820282C3642AB130038E4" xlink:to="lab_us-gaap_TransferToOtherRealEstate_BC378EE7D43820282C3642AB130038E4" xlink:type="arc" />
    <link:label id="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_B848B2B2D633B31A693442AB1300946D_terseLabel_en-US" xlink:label="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_B848B2B2D633B31A693442AB1300946D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsettled securities purchases</link:label>
    <link:label id="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_B848B2B2D633B31A693442AB1300946D_label_en-US" xlink:label="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_B848B2B2D633B31A693442AB1300946D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsettled Purchases Of Securities Available For Sale</link:label>
    <link:label id="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_B848B2B2D633B31A693442AB1300946D_documentation_en-US" xlink:label="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_B848B2B2D633B31A693442AB1300946D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount related to unsettled purchases of securities available for sale.</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale" xlink:label="loc_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_B848B2B2D633B31A693442AB1300946D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_B848B2B2D633B31A693442AB1300946D" xlink:to="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_B848B2B2D633B31A693442AB1300946D" xlink:type="arc" />
    <link:label id="lab_ucbi_UnsettledGovernmentGuaranteedLoanPurchases_CC5092D665A2B9514E6542AB1300FDCA_terseLabel_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanPurchases_CC5092D665A2B9514E6542AB1300FDCA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsettled government guaranteed loan purchases</link:label>
    <link:label id="lab_ucbi_UnsettledGovernmentGuaranteedLoanPurchases_CC5092D665A2B9514E6542AB1300FDCA_label_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanPurchases_CC5092D665A2B9514E6542AB1300FDCA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsettled government guaranteed loan purchases</link:label>
    <link:label id="lab_ucbi_UnsettledGovernmentGuaranteedLoanPurchases_CC5092D665A2B9514E6542AB1300FDCA_documentation_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanPurchases_CC5092D665A2B9514E6542AB1300FDCA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount related to unsettled government guaranteed loan purchases.</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_UnsettledGovernmentGuaranteedLoanPurchases" xlink:label="loc_ucbi_UnsettledGovernmentGuaranteedLoanPurchases_CC5092D665A2B9514E6542AB1300FDCA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_UnsettledGovernmentGuaranteedLoanPurchases_CC5092D665A2B9514E6542AB1300FDCA" xlink:to="lab_ucbi_UnsettledGovernmentGuaranteedLoanPurchases_CC5092D665A2B9514E6542AB1300FDCA" xlink:type="arc" />
    <link:label id="lab_ucbi_AcquisitionsAbstract_F0904930715EBBB122BF42AB1300756C_terseLabel_en-US" xlink:label="lab_ucbi_AcquisitionsAbstract_F0904930715EBBB122BF42AB1300756C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisitions:</link:label>
    <link:label id="lab_ucbi_AcquisitionsAbstract_F0904930715EBBB122BF42AB1300756C_label_en-US" xlink:label="lab_ucbi_AcquisitionsAbstract_F0904930715EBBB122BF42AB1300756C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquisitions [Abstract]</link:label>
    <link:label id="lab_ucbi_AcquisitionsAbstract_F0904930715EBBB122BF42AB1300756C_documentation_en-US" xlink:label="lab_ucbi_AcquisitionsAbstract_F0904930715EBBB122BF42AB1300756C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_AcquisitionsAbstract" xlink:label="loc_ucbi_AcquisitionsAbstract_F0904930715EBBB122BF42AB1300756C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_AcquisitionsAbstract_F0904930715EBBB122BF42AB1300756C" xlink:to="lab_ucbi_AcquisitionsAbstract_F0904930715EBBB122BF42AB1300756C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueOfAssetsAcquired_E8D8EED04D458F73F4C142AB1300CD49_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueOfAssetsAcquired_E8D8EED04D458F73F4C142AB1300CD49" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets acquired</link:label>
    <link:label id="lab_us-gaap_FairValueOfAssetsAcquired_E8D8EED04D458F73F4C142AB1300CD49_label_en-US" xlink:label="lab_us-gaap_FairValueOfAssetsAcquired_E8D8EED04D458F73F4C142AB1300CD49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value of Assets Acquired</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueOfAssetsAcquired" xlink:label="loc_us-gaap_FairValueOfAssetsAcquired_E8D8EED04D458F73F4C142AB1300CD49" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueOfAssetsAcquired_E8D8EED04D458F73F4C142AB1300CD49" xlink:to="lab_us-gaap_FairValueOfAssetsAcquired_E8D8EED04D458F73F4C142AB1300CD49" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesAssumed1_F9A27DAC465BAB287DA342AB1301F560_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAssumed1_F9A27DAC465BAB287DA342AB1301F560" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities assumed</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAssumed1_F9A27DAC465BAB287DA342AB1301F560_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAssumed1_F9A27DAC465BAB287DA342AB1301F560" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities Assumed</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAssumed1" xlink:label="loc_us-gaap_LiabilitiesAssumed1_F9A27DAC465BAB287DA342AB1301F560" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAssumed1_F9A27DAC465BAB287DA342AB1301F560" xlink:to="lab_us-gaap_LiabilitiesAssumed1_F9A27DAC465BAB287DA342AB1301F560" xlink:type="arc" />
    <link:label id="lab_ucbi_NetAssetsAcquired_CA74FDE376DE4AC27ADC42AB130130AA_terseLabel_en-US" xlink:label="lab_ucbi_NetAssetsAcquired_CA74FDE376DE4AC27ADC42AB130130AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net assets acquired</link:label>
    <link:label id="lab_ucbi_NetAssetsAcquired_CA74FDE376DE4AC27ADC42AB130130AA_label_en-US" xlink:label="lab_ucbi_NetAssetsAcquired_CA74FDE376DE4AC27ADC42AB130130AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Assets Acquired</link:label>
    <link:label id="lab_ucbi_NetAssetsAcquired_CA74FDE376DE4AC27ADC42AB130130AA_documentation_en-US" xlink:label="lab_ucbi_NetAssetsAcquired_CA74FDE376DE4AC27ADC42AB130130AA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents total amount of assets acquired.</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_NetAssetsAcquired" xlink:label="loc_ucbi_NetAssetsAcquired_CA74FDE376DE4AC27ADC42AB130130AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_NetAssetsAcquired_CA74FDE376DE4AC27ADC42AB130130AA" xlink:to="lab_ucbi_NetAssetsAcquired_CA74FDE376DE4AC27ADC42AB130130AA" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssued1_36FCB6219C33AAF3300B42AB13011A06_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssued1_36FCB6219C33AAF3300B42AB13011A06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock issued in acquisitions</link:label>
    <link:label id="lab_us-gaap_StockIssued1_36FCB6219C33AAF3300B42AB13011A06_label_en-US" xlink:label="lab_us-gaap_StockIssued1_36FCB6219C33AAF3300B42AB13011A06" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssued1" xlink:label="loc_us-gaap_StockIssued1_36FCB6219C33AAF3300B42AB13011A06" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssued1_36FCB6219C33AAF3300B42AB13011A06" xlink:to="lab_us-gaap_StockIssued1_36FCB6219C33AAF3300B42AB13011A06" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_8E196E2A80A114A04895F786A616CAD7_verboseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_00704E9273FE54A8A260DCECC5B3D655" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Loss [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_00704E9273FE54A8A260DCECC5B3D655" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InvestmentTypeAxis_64C15B61BFEB9DB8AE5842AB1234E19A_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentTypeAxis_64C15B61BFEB9DB8AE5842AB1234E19A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment Type [Axis]</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_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_64C15B61BFEB9DB8AE5842AB1234E19A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InvestmentTypeCategorizationMember_4966EC0FF9D6CB75031A42AB123514CB_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentTypeCategorizationMember_4966EC0FF9D6CB75031A42AB123514CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments [Domain]</link:label>
    <link:label id="lab_us-gaap_InvestmentTypeCategorizationMember_4966EC0FF9D6CB75031A42AB123514CB_label_en-US" xlink:label="lab_us-gaap_InvestmentTypeCategorizationMember_4966EC0FF9D6CB75031A42AB123514CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments [Domain]</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_InvestmentTypeCategorizationMember_4966EC0FF9D6CB75031A42AB123514CB" xlink:to="lab_us-gaap_InvestmentTypeCategorizationMember_4966EC0FF9D6CB75031A42AB123514CB" xlink:type="arc" />
    <link:label id="lab_us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember_B4EF88D50C637414D7B242AB1235D4E5_verboseLabel_en-US" xlink:label="lab_us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember_B4EF88D50C637414D7B242AB1235D4E5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">FHLB</link:label>
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    <link:label id="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_8056EFF6DD58A08D95FF42AB1237D85C_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_8056EFF6DD58A08D95FF42AB1237D85C" 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_8056EFF6DD58A08D95FF42AB1237D85C_label_en-US" xlink:label="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_8056EFF6DD58A08D95FF42AB1237D85C" 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_8056EFF6DD58A08D95FF42AB1237D85C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LoansPledgedAsCollateral_E6C8646373B6E7F70E3142AB123765F2_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansPledgedAsCollateral_E6C8646373B6E7F70E3142AB123765F2" 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>
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    <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_E6C8646373B6E7F70E3142AB123765F2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_73D1FA8AE08C037B52A842AB12373F52_terseLabel_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet_73D1FA8AE08C037B52A842AB12373F52" 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>
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    <link:label id="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_9EF9E37E08515D33D1CF42AB1237A52A_verboseLabel_en-US" xlink:label="lab_us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance_9EF9E37E08515D33D1CF42AB1237A52A" 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>
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    <link:label id="lab_us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums_48F03B08EDE4412729E942AB12373020_verboseLabel_en-US" xlink:label="lab_us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums_48F03B08EDE4412729E942AB12373020" 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>
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    <link:label id="lab_us-gaap_NetInvestmentInLease_1E19D9BEFD18434030D242AB12384FF7_terseLabel_en-US" xlink:label="lab_us-gaap_NetInvestmentInLease_1E19D9BEFD18434030D242AB12384FF7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Investment in leases</link:label>
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    <link:label id="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_B59AFC0295C42776E32B42AB1238AB27_verboseLabel_en-US" xlink:label="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_B59AFC0295C42776E32B42AB1238AB27" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Criteria amount for evaluation of impairment</link:label>
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    <link:label id="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_F1CF6DC55E78EA39D3CF42AB123897A2_verboseLabel_en-US" xlink:label="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_F1CF6DC55E78EA39D3CF42AB123897A2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Specific reserves</link:label>
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    <link:label id="lab_us-gaap_ImpairmentOfInvestments_CBDB8553D73264A470FF157BCCB4A1D1_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairmentOfInvestments_74F79636ABF850B1A963E1EA21AEF3DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other-than-temporary impairment charges</link:label>
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    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_3E02A0A736CFF0688A5BF747E3D2647F_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_26CE128B2E155B588CAC40A65CA23557" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum future lease payments expected to be received</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_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_26CE128B2E155B588CAC40A65CA23557" xlink:to="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_26CE128B2E155B588CAC40A65CA23557" xlink:type="arc" />
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_14CDD8F83303DF6DB7DEF747E3D2EC85_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_3D62066DDDAA57A29D5255A43AA72672" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remainder of 2019</link:label>
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_14CDD8F83303DF6DB7DEF747E3D2EC85_label_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_3D62066DDDAA57A29D5255A43AA72672" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_3D62066DDDAA57A29D5255A43AA72672" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_E3AFBEC226910EF5A77BF747E3D22472_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_D920C85ECC36543199205942AA63F1D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</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_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_D920C85ECC36543199205942AA63F1D2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_43D04D20DD63DE47BC65F747E3D26102_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_DBD903A54C3D599EBD793FBC8887D406" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</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_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_DBD903A54C3D599EBD793FBC8887D406" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_DBD903A54C3D599EBD793FBC8887D406" xlink:to="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_DBD903A54C3D599EBD793FBC8887D406" xlink:type="arc" />
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_5D32B84D73AF90EF71B5F747E3D234F0_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_3A794E2E79F05438B334E728C209E471" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</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_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_3A794E2E79F05438B334E728C209E471" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_94908DFA546C84A83D6AF747E3D2C8DE_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_75AFE5E41BA35F2A9CD0E44EE3C5538F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
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    <link:label id="lab_us-gaap_AssetsAbstract_14F34CE446240E77234637310E1AC38E_verboseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_14F34CE446240E77234637310E1AC38E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">ASSETS</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_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1" xlink:label="loc_us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1_655D7115721B5628894AE32D7970DC90" 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_SecuritiesPurchasedUnderAgreementsToResellLiability" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability_C0402196F0B66655E6BE39D3E947E404" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_3A72616F90A13F252DC439D3E94728F2_label_en-US" xlink:label="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_3A72616F90A13F252DC439D3E94728F2" 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_3A72616F90A13F252DC439D3E94728F2" xlink:type="locator" />
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    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_5CACE787CD17366EAD4A39D3E9475F69_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_5CACE787CD17366EAD4A39D3E9475F69" 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>
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    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_2008C813032D331E412339D3E947AC1B_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_2008C813032D331E412339D3E947AC1B" 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>
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    <link:label id="lab_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_F6B849F445B529358D2939D3E94953B7_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_F6B849F445B529358D2939D3E94953B7" 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_F6B849F445B529358D2939D3E94953B7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_35D696204317BB64E1F639D3E949D2C7_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_35D696204317BB64E1F639D3E949D2C7" 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_35D696204317BB64E1F639D3E949D2C7_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_35D696204317BB64E1F639D3E949D2C7" 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:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability_047CBD49396F6DDB084539D3E94991B9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_613D4F0101F6235789B739D3E9499ABA_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_613D4F0101F6235789B739D3E9499ABA" 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_613D4F0101F6235789B739D3E9499ABA_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_613D4F0101F6235789B739D3E9499ABA" 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_613D4F0101F6235789B739D3E9499ABA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_1A506D459620FD917F6939D3E949DF00_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_1A506D459620FD917F6939D3E949DF00" 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_1A506D459620FD917F6939D3E949DF00_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_1A506D459620FD917F6939D3E949DF00" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_1A506D459620FD917F6939D3E949DF00" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral_5C991AB668AC7AE4746C39D3E94A6447_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral_5C991AB668AC7AE4746C39D3E94A6447" 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:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral_5C991AB668AC7AE4746C39D3E94A6447" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_EF7849D74AAA119E0EEF39D3E94A510C_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_EF7849D74AAA119E0EEF39D3E94A510C" 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_EF7849D74AAA119E0EEF39D3E94A510C_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_EF7849D74AAA119E0EEF39D3E94A510C" 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:label id="lab_ucbi_WeightedAverageInterestRateOfReverseRepurchaseAgreementsAssets_D1B6F88BC395611A28EF39D3E94ABBEC_verboseLabel_en-US" xlink:label="lab_ucbi_WeightedAverageInterestRateOfReverseRepurchaseAgreementsAssets_D1B6F88BC395611A28EF39D3E94ABBEC" 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_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_AD0186766A99A528753539D3E94AC59C_verboseLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_AD0186766A99A528753539D3E94AC59C" 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:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_AD0186766A99A528753539D3E94AC59C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_A607C9EED14D7AAA511939D3E94A071B_negatedLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_A607C9EED14D7AAA511939D3E94A071B" 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_A607C9EED14D7AAA511939D3E94A071B_label_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_A607C9EED14D7AAA511939D3E94A071B" 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_A607C9EED14D7AAA511939D3E94A071B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_A607C9EED14D7AAA511939D3E94A071B" xlink:to="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_A607C9EED14D7AAA511939D3E94A071B" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_12432756DF466B7BE45439D3E94AEE62_totalLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_12432756DF466B7BE45439D3E94AEE62" 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_12432756DF466B7BE45439D3E94AEE62_label_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_12432756DF466B7BE45439D3E94AEE62" 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_12432756DF466B7BE45439D3E94AEE62" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_12432756DF466B7BE45439D3E94AEE62" xlink:to="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_12432756DF466B7BE45439D3E94AEE62" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_3AA1AF2AB8CEBBE55BD839D3E94BFDEF_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_3AA1AF2AB8CEBBE55BD839D3E94BFDEF" 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_3AA1AF2AB8CEBBE55BD839D3E94BFDEF_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_3AA1AF2AB8CEBBE55BD839D3E94BFDEF" 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_3AA1AF2AB8CEBBE55BD839D3E94BFDEF_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_3AA1AF2AB8CEBBE55BD839D3E94BFDEF" 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-20190930.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_3AA1AF2AB8CEBBE55BD839D3E94BFDEF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_3AA1AF2AB8CEBBE55BD839D3E94BFDEF" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_3AA1AF2AB8CEBBE55BD839D3E94BFDEF" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_BEA02D3AB51E877D262439D3E94B32F7_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_BEA02D3AB51E877D262439D3E94B32F7" 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_BEA02D3AB51E877D262439D3E94B32F7_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_BEA02D3AB51E877D262439D3E94B32F7" 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_BEA02D3AB51E877D262439D3E94B32F7_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_BEA02D3AB51E877D262439D3E94B32F7" 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-20190930.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_BEA02D3AB51E877D262439D3E94B32F7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_BEA02D3AB51E877D262439D3E94B32F7" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_BEA02D3AB51E877D262439D3E94B32F7" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_BE3FEEACF929D6A79E6839D3E94B5B2F_totalLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_BE3FEEACF929D6A79E6839D3E94B5B2F" 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_BE3FEEACF929D6A79E6839D3E94B5B2F_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_BE3FEEACF929D6A79E6839D3E94B5B2F" 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_BE3FEEACF929D6A79E6839D3E94B5B2F_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_BE3FEEACF929D6A79E6839D3E94B5B2F" 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-20190930.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_BE3FEEACF929D6A79E6839D3E94B5B2F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_BE3FEEACF929D6A79E6839D3E94B5B2F" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_BE3FEEACF929D6A79E6839D3E94B5B2F" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_43DDD618441192EDB0AE39D3E94B43D2_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_43DDD618441192EDB0AE39D3E94B43D2" 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_43DDD618441192EDB0AE39D3E94B43D2_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_43DDD618441192EDB0AE39D3E94B43D2" 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_43DDD618441192EDB0AE39D3E94B43D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_43DDD618441192EDB0AE39D3E94B43D2" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_43DDD618441192EDB0AE39D3E94B43D2" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_346D9ACED63B5BE80C4B39D3E94B28C5_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_346D9ACED63B5BE80C4B39D3E94B28C5" 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_346D9ACED63B5BE80C4B39D3E94B28C5_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_346D9ACED63B5BE80C4B39D3E94B28C5" 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_346D9ACED63B5BE80C4B39D3E94B28C5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_346D9ACED63B5BE80C4B39D3E94B28C5" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_346D9ACED63B5BE80C4B39D3E94B28C5" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_896EDB49C7B78A79E30139D3E94B1FF8_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_896EDB49C7B78A79E30139D3E94B1FF8" 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_896EDB49C7B78A79E30139D3E94B1FF8_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_896EDB49C7B78A79E30139D3E94B1FF8" 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_896EDB49C7B78A79E30139D3E94B1FF8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_896EDB49C7B78A79E30139D3E94B1FF8" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_896EDB49C7B78A79E30139D3E94B1FF8" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_0EB452460DDF2CB582C339D3E94B0D84_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_0EB452460DDF2CB582C339D3E94B0D84" 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_0EB452460DDF2CB582C339D3E94B0D84_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_0EB452460DDF2CB582C339D3E94B0D84" 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_0EB452460DDF2CB582C339D3E94B0D84" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_8FAB56D4158A71D9D4BF39D3E94C8E00_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_8FAB56D4158A71D9D4BF39D3E94C8E00" 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_8FAB56D4158A71D9D4BF39D3E94C8E00_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_8FAB56D4158A71D9D4BF39D3E94C8E00" 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_8FAB56D4158A71D9D4BF39D3E94C8E00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_8FAB56D4158A71D9D4BF39D3E94C8E00" xlink:to="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_8FAB56D4158A71D9D4BF39D3E94C8E00" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_39E076CF71C841D03D4639D3E94C659D_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_39E076CF71C841D03D4639D3E94C659D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivatives, net amount</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_39E076CF71C841D03D4639D3E94C659D_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_39E076CF71C841D03D4639D3E94C659D" 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_39E076CF71C841D03D4639D3E94C659D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_39E076CF71C841D03D4639D3E94C659D" xlink:to="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_39E076CF71C841D03D4639D3E94C659D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_D4FABFDF776E1A50AF7A39D3E94C11EE_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_D4FABFDF776E1A50AF7A39D3E94C11EE" 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:label id="lab_us-gaap_IntangibleAssetsNetIncludingGoodwill_778DE94F6574AFB2AED4F8CC4A72EE69_totalLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetIncludingGoodwill_2B36062855E85789927C491ED42AA07E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total goodwill and other intangible assets, net</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_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2C3CE59E6F88325CA4D439D3E9AB37FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2C3CE59E6F88325CA4D439D3E9AB37FF" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2C3CE59E6F88325CA4D439D3E9AB37FF" xlink:type="arc" />
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    <link:label id="lab_ucbi_StockIssuedDuringPeriodSharesDividendReinvestmentPlanAndEmployeeBenefitPlans_ECFC07D36FC59920DDF839D3E9AB94A8_documentation_en-US" xlink:label="lab_ucbi_StockIssuedDuringPeriodSharesDividendReinvestmentPlanAndEmployeeBenefitPlans_ECFC07D36FC59920DDF839D3E9AB94A8" 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_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_56028169032E3999665039D3E9ABE64F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_37DC7057D98DE98BF4CF511E201B1444_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_946F27D35A9D5776B611BEE3E8758A4A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value by Liability Class [Domain]</link:label>
    <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_946F27D35A9D5776B611BEE3E8758A4A" xlink:type="locator" />
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    <link:label id="lab_ucbi_DerivativeLiabilityMember_AADF6580E30909C95B65511E201BA99A_verboseLabel_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_8B1C9CEC310357FABDCB1B6709EC6CC4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liability</link:label>
    <link:label id="lab_ucbi_DerivativeLiabilityMember_AADF6580E30909C95B65511E201BA99A_label_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_8B1C9CEC310357FABDCB1B6709EC6CC4" 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_AADF6580E30909C95B65511E201BA99A_documentation_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_8B1C9CEC310357FABDCB1B6709EC6CC4" 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-20190930.xsd#ucbi_DerivativeLiabilityMember" xlink:label="loc_ucbi_DerivativeLiabilityMember_8B1C9CEC310357FABDCB1B6709EC6CC4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueByAssetClassAxis_C490D1E39A9FCCA286DE511E201B392B_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis_252DEE498EB359AB9DEFF6DEFE88C742" 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_C490D1E39A9FCCA286DE511E201B392B_label_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis_252DEE498EB359AB9DEFF6DEFE88C742" 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_252DEE498EB359AB9DEFF6DEFE88C742" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9CE993EDDD26DBD95F11511E201CB47D_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_80BA7874C7ED50D681530CA20910DB5E" 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_9CE993EDDD26DBD95F11511E201CB47D_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_80BA7874C7ED50D681530CA20910DB5E" 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_80BA7874C7ED50D681530CA20910DB5E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_80BA7874C7ED50D681530CA20910DB5E" xlink:to="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_80BA7874C7ED50D681530CA20910DB5E" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeAssetMember_FF9F2E093E8DC82DE7BC511E201C24F9_verboseLabel_en-US" xlink:label="lab_ucbi_DerivativeAssetMember_9E735D5D8BCB5703AA09AF06B2610B85" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Derivative Asset</link:label>
    <link:label id="lab_ucbi_DerivativeAssetMember_FF9F2E093E8DC82DE7BC511E201C24F9_label_en-US" xlink:label="lab_ucbi_DerivativeAssetMember_9E735D5D8BCB5703AA09AF06B2610B85" 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_FF9F2E093E8DC82DE7BC511E201C24F9_documentation_en-US" xlink:label="lab_ucbi_DerivativeAssetMember_9E735D5D8BCB5703AA09AF06B2610B85" 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-20190930.xsd#ucbi_DerivativeAssetMember" xlink:label="loc_ucbi_DerivativeAssetMember_9E735D5D8BCB5703AA09AF06B2610B85" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeAssetMember_9E735D5D8BCB5703AA09AF06B2610B85" xlink:to="lab_ucbi_DerivativeAssetMember_9E735D5D8BCB5703AA09AF06B2610B85" xlink:type="arc" />
    <link:label id="lab_ucbi_SBAServicingRightsMember_BF4F71DA75FEF6107DDC511E201CAABC_terseLabel_en-US" xlink:label="lab_ucbi_SBAServicingRightsMember_9AE9DE72F296504B9A59B3A9763CFC63" 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_BF4F71DA75FEF6107DDC511E201CAABC_label_en-US" xlink:label="lab_ucbi_SBAServicingRightsMember_9AE9DE72F296504B9A59B3A9763CFC63" 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_BF4F71DA75FEF6107DDC511E201CAABC_documentation_en-US" xlink:label="lab_ucbi_SBAServicingRightsMember_9AE9DE72F296504B9A59B3A9763CFC63" 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-20190930.xsd#ucbi_SBAServicingRightsMember" xlink:label="loc_ucbi_SBAServicingRightsMember_9AE9DE72F296504B9A59B3A9763CFC63" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_SBAServicingRightsMember_9AE9DE72F296504B9A59B3A9763CFC63" xlink:to="lab_ucbi_SBAServicingRightsMember_9AE9DE72F296504B9A59B3A9763CFC63" xlink:type="arc" />
    <link:label id="lab_ucbi_ResidentialMortgageServicingRightsMember_AEBDF175276B5BFE67D9511E201CA216_verboseLabel_en-US" xlink:label="lab_ucbi_ResidentialMortgageServicingRightsMember_19AC8716012A5D09BB7917EB8A124A80" 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_AEBDF175276B5BFE67D9511E201CA216_label_en-US" xlink:label="lab_ucbi_ResidentialMortgageServicingRightsMember_19AC8716012A5D09BB7917EB8A124A80" 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_AEBDF175276B5BFE67D9511E201CA216_documentation_en-US" xlink:label="lab_ucbi_ResidentialMortgageServicingRightsMember_19AC8716012A5D09BB7917EB8A124A80" 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-20190930.xsd#ucbi_ResidentialMortgageServicingRightsMember" xlink:label="loc_ucbi_ResidentialMortgageServicingRightsMember_19AC8716012A5D09BB7917EB8A124A80" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_ResidentialMortgageServicingRightsMember_19AC8716012A5D09BB7917EB8A124A80" xlink:to="lab_ucbi_ResidentialMortgageServicingRightsMember_19AC8716012A5D09BB7917EB8A124A80" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableforsaleSecuritiesMember_595B253D8BCE92DB38D0511E201DC7DF_verboseLabel_en-US" xlink:label="lab_us-gaap_AvailableforsaleSecuritiesMember_579A07C84C9459BDAF544FF1AB8CCFFA" 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_579A07C84C9459BDAF544FF1AB8CCFFA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableforsaleSecuritiesMember" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesMember_579A07C84C9459BDAF544FF1AB8CCFFA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableforsaleSecuritiesMember_579A07C84C9459BDAF544FF1AB8CCFFA" xlink:to="lab_us-gaap_AvailableforsaleSecuritiesMember_579A07C84C9459BDAF544FF1AB8CCFFA" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_C311CEA557EE70553D2B511E201D6290_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_1427C51D9A405AAA892316E399413ADB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_C311CEA557EE70553D2B511E201D6290_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_1427C51D9A405AAA892316E399413ADB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_1427C51D9A405AAA892316E399413ADB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_1427C51D9A405AAA892316E399413ADB" xlink:to="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_1427C51D9A405AAA892316E399413ADB" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_8135EF447182E4358641511E201D1AD7_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_F7FF8332C545583B8159F57326FA4A52" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of Assets at Level 3 Measurement</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_8135EF447182E4358641511E201D1AD7_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_F7FF8332C545583B8159F57326FA4A52" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_F7FF8332C545583B8159F57326FA4A52" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_F7FF8332C545583B8159F57326FA4A52" xlink:to="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_F7FF8332C545583B8159F57326FA4A52" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_220F639D28493BCD4A71511E201D3AE0_periodStartLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_E903AC509E765B7AA6A168FBCDF98F9E" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at beginning of period</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_220F639D28493BCD4A71511E201D3AE0_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_E903AC509E765B7AA6A168FBCDF98F9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_E903AC509E765B7AA6A168FBCDF98F9E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_E903AC509E765B7AA6A168FBCDF98F9E" xlink:to="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_E903AC509E765B7AA6A168FBCDF98F9E" xlink:type="arc" />
    <link:label id="lab_ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment_011A20F73EAB557AD818511E201DFB7F_terseLabel_en-US" xlink:label="lab_ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment_E99E29FDFB405207A70FFD389E358D1E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business combinations</link:label>
    <link:label id="lab_ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment_011A20F73EAB557AD818511E201DFB7F_label_en-US" xlink:label="lab_ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment_E99E29FDFB405207A70FFD389E358D1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Business Combination And Provisional Adjustment</link:label>
    <link:label id="lab_ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment_011A20F73EAB557AD818511E201DFB7F_documentation_en-US" xlink:label="lab_ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment_E99E29FDFB405207A70FFD389E358D1E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Business Combination And Provisional Adjustment</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment" xlink:label="loc_ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment_E99E29FDFB405207A70FFD389E358D1E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment_E99E29FDFB405207A70FFD389E358D1E" xlink:to="lab_ucbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetBusinessCombinationAndProvisionalAdjustment_E99E29FDFB405207A70FFD389E358D1E" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_238A5BC030E6163F85D0511E201D8534_verboseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_96B7B258469D5E3692B319C4A6F6A6C3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Additions</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_AssetsSoldUnderAgreementsToRepurchaseLineItems_A9682BED86EE515299DF304FB49E0470" xlink:to="lab_us-gaap_AssetsSoldUnderAgreementsToRepurchaseLineItems_A9682BED86EE515299DF304FB49E0470" xlink:type="arc" />
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    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_2243F8D463B2D0C5CF4EF747E0BFC9E1_label_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_0CA50162F39B5E5A82EDDE1D881BF707" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_0CA50162F39B5E5A82EDDE1D881BF707" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SecuritiesLoanedGrossIncludingNotSubjectToMasterNettingArrangement_A3F04ADDA74E254F10B8F747E0BF3322_terseLabel_en-US" xlink:label="lab_us-gaap_SecuritiesLoanedGrossIncludingNotSubjectToMasterNettingArrangement_C52C81A2E4D85B9A8CF54BBAFA56DA0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross amount of recognized liabilities for repurchase agreements in offsetting disclosure</link:label>
    <link:label id="lab_us-gaap_SecuritiesLoanedGrossIncludingNotSubjectToMasterNettingArrangement_A3F04ADDA74E254F10B8F747E0BF3322_label_en-US" xlink:label="lab_us-gaap_SecuritiesLoanedGrossIncludingNotSubjectToMasterNettingArrangement_C52C81A2E4D85B9A8CF54BBAFA56DA0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Securities Loaned, Gross Including Not Subject to Master Netting Arrangement</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuritiesLoanedGrossIncludingNotSubjectToMasterNettingArrangement" xlink:label="loc_us-gaap_SecuritiesLoanedGrossIncludingNotSubjectToMasterNettingArrangement_C52C81A2E4D85B9A8CF54BBAFA56DA0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesLoanedGrossIncludingNotSubjectToMasterNettingArrangement_C52C81A2E4D85B9A8CF54BBAFA56DA0A" xlink:to="lab_us-gaap_SecuritiesLoanedGrossIncludingNotSubjectToMasterNettingArrangement_C52C81A2E4D85B9A8CF54BBAFA56DA0A" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_274735546B7FF697BB40F747E0BFCEDD_verboseLabel_en-US" xlink:label="lab_us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_9BF792237D0E59EFBC619A379B3B96F6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Amounts related to agreements not included in offsetting disclosure</link:label>
    <link:label id="lab_us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_274735546B7FF697BB40F747E0BFCEDD_label_en-US" xlink:label="lab_us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_9BF792237D0E59EFBC619A379B3B96F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement" xlink:label="loc_us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_9BF792237D0E59EFBC619A379B3B96F6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_9BF792237D0E59EFBC619A379B3B96F6" xlink:to="lab_us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_9BF792237D0E59EFBC619A379B3B96F6" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_95DBB9E69505925F5856F8CC4BF4C92F_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_BDC4704522D2523491F1F7D2B523C1E2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loans and Leases and Allowance for Credit Losses</link:label>
    <link:label id="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_95DBB9E69505925F5856F8CC4BF4C92F_label_en-US" xlink:label="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_BDC4704522D2523491F1F7D2B523C1E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans, Notes, Trade and Other Receivables Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock" xlink:label="loc_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_BDC4704522D2523491F1F7D2B523C1E2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NondesignatedMember_0A727060784233C264326D3296F34F12_terseLabel_en-US" xlink:label="lab_us-gaap_NondesignatedMember_63EC67212C1350F991C752EB81E76563" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Not Designated as Hedging Instrument</link:label>
    <link:label id="lab_us-gaap_NondesignatedMember_0A727060784233C264326D3296F34F12_label_en-US" xlink:label="lab_us-gaap_NondesignatedMember_63EC67212C1350F991C752EB81E76563" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Not Designated as Hedging Instrument [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_63EC67212C1350F991C752EB81E76563" xlink:type="locator" />
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    <link:label id="lab_ucbi_CustomerDerivativesAndDealerOffsetsMember_714392C290960F9E77FF6D3296F440BF_terseLabel_en-US" xlink:label="lab_ucbi_CustomerDerivativesAndDealerOffsetsMember_E4D0A9060A2C5B06B06A589FC894BF13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer derivatives and dealer offsets</link:label>
    <link:label id="lab_ucbi_CustomerDerivativesAndDealerOffsetsMember_714392C290960F9E77FF6D3296F440BF_label_en-US" xlink:label="lab_ucbi_CustomerDerivativesAndDealerOffsetsMember_E4D0A9060A2C5B06B06A589FC894BF13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Derivatives And Dealer Offsets [Member]</link:label>
    <link:label id="lab_ucbi_CustomerDerivativesAndDealerOffsetsMember_714392C290960F9E77FF6D3296F440BF_documentation_en-US" xlink:label="lab_ucbi_CustomerDerivativesAndDealerOffsetsMember_E4D0A9060A2C5B06B06A589FC894BF13" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Information of Customer Derivatives And Dealer Offsets.</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_CustomerDerivativesAndDealerOffsetsMember" xlink:label="loc_ucbi_CustomerDerivativesAndDealerOffsetsMember_E4D0A9060A2C5B06B06A589FC894BF13" xlink:type="locator" />
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    <link:label id="lab_ucbi_BifurcatedEmbeddedDerivativesAndDealerOffsetsMember_39426B9FE4AA6375620F6D3296F47365_terseLabel_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativesAndDealerOffsetsMember_D8BCBCE5C11C533EAEA54F90A452801D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bifurcated embedded derivatives and dealer offsets</link:label>
    <link:label id="lab_ucbi_BifurcatedEmbeddedDerivativesAndDealerOffsetsMember_39426B9FE4AA6375620F6D3296F47365_label_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativesAndDealerOffsetsMember_D8BCBCE5C11C533EAEA54F90A452801D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bifurcated Embedded Derivatives And Dealer Offsets [Member]</link:label>
    <link:label id="lab_ucbi_BifurcatedEmbeddedDerivativesAndDealerOffsetsMember_39426B9FE4AA6375620F6D3296F47365_documentation_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativesAndDealerOffsetsMember_D8BCBCE5C11C533EAEA54F90A452801D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Bifurcated embedded derivatives and dealer offsets.</link:label>
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    <link:label id="lab_us-gaap_InterestRateCapMember_F547F4497D8FE6CA18546D3296F437B3_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestRateCapMember_43D8B5A20EBC50CA86976038BBAB11ED" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Interest rate caps</link:label>
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    <link:label id="lab_ucbi_DeDesignatedCashFlowHedgeMember_FF47558A2033F8A8B5A86D3296F4C5D6_terseLabel_en-US" xlink:label="lab_ucbi_DeDesignatedCashFlowHedgeMember_96AF2F483A7D53BEADAF2D493E4D286F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">De-designated hedges</link:label>
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    <link:label id="lab_ucbi_DeDesignatedCashFlowHedgeMember_FF47558A2033F8A8B5A86D3296F4C5D6_documentation_en-US" xlink:label="lab_ucbi_DeDesignatedCashFlowHedgeMember_96AF2F483A7D53BEADAF2D493E4D286F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents de-designated cash flow hedge.</link:label>
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    <link:label id="lab_ucbi_MortgageBankingDerivativesMember_0BDD9FD6F57D91976D0B6D3296F5C6D0_terseLabel_en-US" xlink:label="lab_ucbi_MortgageBankingDerivativesMember_9D12321BC443515DA5FB228B84395BFA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mortgage banking derivatives</link:label>
    <link:label id="lab_ucbi_MortgageBankingDerivativesMember_0BDD9FD6F57D91976D0B6D3296F5C6D0_label_en-US" xlink:label="lab_ucbi_MortgageBankingDerivativesMember_9D12321BC443515DA5FB228B84395BFA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage Banking Derivatives [Member]</link:label>
    <link:label id="lab_ucbi_MortgageBankingDerivativesMember_0BDD9FD6F57D91976D0B6D3296F5C6D0_documentation_en-US" xlink:label="lab_ucbi_MortgageBankingDerivativesMember_9D12321BC443515DA5FB228B84395BFA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Information of Mortgage banking derivatives.</link:label>
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    <link:label id="lab_ucbi_RiskParticipationsMember_66ADB18CD26ECF47C7FF6D3296F51A72_verboseLabel_en-US" xlink:label="lab_ucbi_RiskParticipationsMember_6071102D699A52F59852F8F85E1CC94F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Risk participations</link:label>
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    <link:label id="lab_ucbi_RiskParticipationsMember_66ADB18CD26ECF47C7FF6D3296F51A72_documentation_en-US" xlink:label="lab_ucbi_RiskParticipationsMember_6071102D699A52F59852F8F85E1CC94F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information about risk participations.</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_A7767DA1B28CB1D2A658F747E55366FB_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_783A8A92135F5D2588CFAB95F80DB7FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_67C59768B7A67BA7D3C242AB1340BF2E_label_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_67C59768B7A67BA7D3C242AB1340BF2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">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>
    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_67C59768B7A67BA7D3C242AB1340BF2E_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludedInNetPeriodicPensionCostForDefinedBenefitPensionPlanTaxExpenseBenefit_67C59768B7A67BA7D3C242AB1340BF2E" 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_882D1F888B73D0CF2DDB42AB13403668_totalLabel_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_882D1F888B73D0CF2DDB42AB13403668" 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>
    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_882D1F888B73D0CF2DDB42AB13403668_label_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_882D1F888B73D0CF2DDB42AB13403668" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income Loss Amortization Of Prior Service Cost And Actuarial Losses Include Net Periodic Pension Cost For Defined Benefit Pension Plan Net Of Tax</link:label>
    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_882D1F888B73D0CF2DDB42AB13403668_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_882D1F888B73D0CF2DDB42AB13403668" 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>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax" xlink:label="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_882D1F888B73D0CF2DDB42AB13403668" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_882D1F888B73D0CF2DDB42AB13403668" xlink:to="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfPriorServiceCostAndActuarialLossesIncludeNetPeriodicPensionCostForDefinedBenefitPensionPlanNetOfTax_882D1F888B73D0CF2DDB42AB13403668" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_A2C99C5C53A1714352E442AB134087C5_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_A2C99C5C53A1714352E442AB134087C5" 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_A2C99C5C53A1714352E442AB134087C5_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_A2C99C5C53A1714352E442AB134087C5" 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_A2C99C5C53A1714352E442AB134087C5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_A2C99C5C53A1714352E442AB134087C5" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_A2C99C5C53A1714352E442AB134087C5" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_041BDF9E43F46FE499FF42AB134088AF_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_041BDF9E43F46FE499FF42AB134088AF" 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_041BDF9E43F46FE499FF42AB134088AF_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_041BDF9E43F46FE499FF42AB134088AF" 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_041BDF9E43F46FE499FF42AB134088AF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_041BDF9E43F46FE499FF42AB134088AF" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_041BDF9E43F46FE499FF42AB134088AF" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_B2191FB51B0CFE71B45942AB13412CEC_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_B2191FB51B0CFE71B45942AB13412CEC" 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_B2191FB51B0CFE71B45942AB13412CEC_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_B2191FB51B0CFE71B45942AB13412CEC" 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_B2191FB51B0CFE71B45942AB13412CEC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_B2191FB51B0CFE71B45942AB13412CEC" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_B2191FB51B0CFE71B45942AB13412CEC" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_EC70102A75599A6966A942AB1341C250_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_EC70102A75599A6966A942AB1341C250" 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_EC70102A75599A6966A942AB1341C250_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_EC70102A75599A6966A942AB1341C250" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_EC70102A75599A6966A942AB1341C250" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_EC70102A75599A6966A942AB1341C250" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_EC70102A75599A6966A942AB1341C250" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_6EE379A519E9394FBE5142AB13419DE5_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_6EE379A519E9394FBE5142AB13419DE5" 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_6EE379A519E9394FBE5142AB13419DE5_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_6EE379A519E9394FBE5142AB13419DE5" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_6EE379A519E9394FBE5142AB13419DE5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_6EE379A519E9394FBE5142AB13419DE5" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_6EE379A519E9394FBE5142AB13419DE5" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_38ED128004D6B1AF867642AB1341472C_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_38ED128004D6B1AF867642AB1341472C" 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_38ED128004D6B1AF867642AB1341472C" xlink:type="locator" />
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    <link:label id="lab_ucbi_ComprehensiveIncomeLossBeforeTax_5CEB0A922E3AD6DBD56E42AB13412C97_totalLabel_en-US" xlink:label="lab_ucbi_ComprehensiveIncomeLossBeforeTax_5CEB0A922E3AD6DBD56E42AB13412C97" 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_5CEB0A922E3AD6DBD56E42AB13412C97_documentation_en-US" xlink:label="lab_ucbi_ComprehensiveIncomeLossBeforeTax_5CEB0A922E3AD6DBD56E42AB13412C97" 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_5BBBF4EBEA23E508AFC742AB1341B1A8_negatedTotalLabel_en-US" xlink:label="lab_ucbi_ComprehensiveIncomeLossTax_5BBBF4EBEA23E508AFC742AB1341B1A8" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive income, Tax (Expense) Benefit</link:label>
    <link:label id="lab_ucbi_ComprehensiveIncomeLossTax_5BBBF4EBEA23E508AFC742AB1341B1A8_label_en-US" xlink:label="lab_ucbi_ComprehensiveIncomeLossTax_5BBBF4EBEA23E508AFC742AB1341B1A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income Loss Tax</link:label>
    <link:label id="lab_ucbi_ComprehensiveIncomeLossTax_5BBBF4EBEA23E508AFC742AB1341B1A8_documentation_en-US" xlink:label="lab_ucbi_ComprehensiveIncomeLossTax_5BBBF4EBEA23E508AFC742AB1341B1A8" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_C1CAD8200BC43380B8D96D32970DCCE5_terseLabel_en-US" xlink:label="lab_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_DA0FC0F9095E538B8CA3BD932B40A572" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]</link:label>
    <link:label id="lab_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_C1CAD8200BC43380B8D96D32970DCCE5_label_en-US" xlink:label="lab_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_DA0FC0F9095E538B8CA3BD932B40A572" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_DA0FC0F9095E538B8CA3BD932B40A572" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_DA0FC0F9095E538B8CA3BD932B40A572" xlink:to="lab_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_DA0FC0F9095E538B8CA3BD932B40A572" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFinancialInstrumentsAssetsMember_DE1E879F7846497FE8476D32970FBE91_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFinancialInstrumentsAssetsMember_70F1DF328ACD5189B2B7E3D619FF1AB5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative assets</link:label>
    <link:label id="lab_us-gaap_DerivativeFinancialInstrumentsAssetsMember_DE1E879F7846497FE8476D32970FBE91_label_en-US" xlink:label="lab_us-gaap_DerivativeFinancialInstrumentsAssetsMember_70F1DF328ACD5189B2B7E3D619FF1AB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Financial Instruments, Assets [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFinancialInstrumentsAssetsMember" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_70F1DF328ACD5189B2B7E3D619FF1AB5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_70F1DF328ACD5189B2B7E3D619FF1AB5" xlink:to="lab_us-gaap_DerivativeFinancialInstrumentsAssetsMember_70F1DF328ACD5189B2B7E3D619FF1AB5" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_238BC3703F58784894D36D32970FA5B0_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_497E7896626E500E829650A73B37DA6F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative liabilities</link:label>
    <link:label id="lab_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_238BC3703F58784894D36D32970FA5B0_label_en-US" xlink:label="lab_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_497E7896626E500E829650A73B37DA6F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Financial Instruments, Liabilities [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_497E7896626E500E829650A73B37DA6F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_497E7896626E500E829650A73B37DA6F" xlink:to="lab_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_497E7896626E500E829650A73B37DA6F" xlink:type="arc" />
    <link:label id="lab_ucbi_CustomerSwapPositionMember_A31478C415F8E9DC1ABD6D3297106153_verboseLabel_en-US" xlink:label="lab_ucbi_CustomerSwapPositionMember_62C3376963F1588AA7F0C0950821CF5F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Customer derivative positions</link:label>
    <link:label id="lab_ucbi_CustomerSwapPositionMember_A31478C415F8E9DC1ABD6D3297106153_label_en-US" xlink:label="lab_ucbi_CustomerSwapPositionMember_62C3376963F1588AA7F0C0950821CF5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Swap Position [Member]</link:label>
    <link:label id="lab_ucbi_CustomerSwapPositionMember_A31478C415F8E9DC1ABD6D3297106153_documentation_en-US" xlink:label="lab_ucbi_CustomerSwapPositionMember_62C3376963F1588AA7F0C0950821CF5F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the customer swap positions.</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_CustomerSwapPositionMember" xlink:label="loc_ucbi_CustomerSwapPositionMember_62C3376963F1588AA7F0C0950821CF5F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_CustomerSwapPositionMember_62C3376963F1588AA7F0C0950821CF5F" xlink:to="lab_ucbi_CustomerSwapPositionMember_62C3376963F1588AA7F0C0950821CF5F" xlink:type="arc" />
    <link:label id="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_24C54CD1A1F89E8BF8086D329710B66C_verboseLabel_en-US" xlink:label="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_D4E80A3FB9C15116B16C8232D0157E5D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Dealer offsets to customer derivative positions</link:label>
    <link:label id="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_24C54CD1A1F89E8BF8086D329710B66C_label_en-US" xlink:label="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_D4E80A3FB9C15116B16C8232D0157E5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dealer Offset To Customer Swap Position [Member]</link:label>
    <link:label id="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_24C54CD1A1F89E8BF8086D329710B66C_documentation_en-US" xlink:label="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_D4E80A3FB9C15116B16C8232D0157E5D" 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-20190930.xsd#ucbi_DealerOffsetToCustomerSwapPositionMember" xlink:label="loc_ucbi_DealerOffsetToCustomerSwapPositionMember_D4E80A3FB9C15116B16C8232D0157E5D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DealerOffsetToCustomerSwapPositionMember_D4E80A3FB9C15116B16C8232D0157E5D" xlink:to="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_D4E80A3FB9C15116B16C8232D0157E5D" xlink:type="arc" />
    <link:label id="lab_ucbi_MortgageBankingLoanCommitmentMember_DD396460319B96D9B3076D3297107B4D_verboseLabel_en-US" xlink:label="lab_ucbi_MortgageBankingLoanCommitmentMember_C54E9099A5AD5912825D22B6865BF148" 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_C54E9099A5AD5912825D22B6865BF148" 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_C54E9099A5AD5912825D22B6865BF148" 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-20190930.xsd#ucbi_MortgageBankingLoanCommitmentMember" xlink:label="loc_ucbi_MortgageBankingLoanCommitmentMember_C54E9099A5AD5912825D22B6865BF148" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_MortgageBankingLoanCommitmentMember_C54E9099A5AD5912825D22B6865BF148" xlink:to="lab_ucbi_MortgageBankingLoanCommitmentMember_C54E9099A5AD5912825D22B6865BF148" xlink:type="arc" />
    <link:label id="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_520201534F289521323F6D32971197A8_verboseLabel_en-US" xlink:label="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_EB415F0DA64A582A884D28918F8E2607" 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_EB415F0DA64A582A884D28918F8E2607" 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_EB415F0DA64A582A884D28918F8E2607" 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-20190930.xsd#ucbi_MortgageBankingForwardSalesCommitmentMember" xlink:label="loc_ucbi_MortgageBankingForwardSalesCommitmentMember_EB415F0DA64A582A884D28918F8E2607" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_MortgageBankingForwardSalesCommitmentMember_EB415F0DA64A582A884D28918F8E2607" xlink:to="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_EB415F0DA64A582A884D28918F8E2607" xlink:type="arc" />
    <link:label id="lab_ucbi_BifurcatedEmbeddedDerivativeMember_2172F4B46EC7B46612136D329711AC71_verboseLabel_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativeMember_87F146C73D8E56FCBDEB57B6D9B0BA9B" 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_87F146C73D8E56FCBDEB57B6D9B0BA9B" 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_87F146C73D8E56FCBDEB57B6D9B0BA9B" 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-20190930.xsd#ucbi_BifurcatedEmbeddedDerivativeMember" xlink:label="loc_ucbi_BifurcatedEmbeddedDerivativeMember_87F146C73D8E56FCBDEB57B6D9B0BA9B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_BifurcatedEmbeddedDerivativeMember_87F146C73D8E56FCBDEB57B6D9B0BA9B" xlink:to="lab_ucbi_BifurcatedEmbeddedDerivativeMember_87F146C73D8E56FCBDEB57B6D9B0BA9B" xlink:type="arc" />
    <link:label id="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_18F72139BC325D78E93E6D3297118338_verboseLabel_en-US" xlink:label="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_205C01156630552D8447A1690CA5DDFB" 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_205C01156630552D8447A1690CA5DDFB" 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_205C01156630552D8447A1690CA5DDFB" 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-20190930.xsd#ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember" xlink:label="loc_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_205C01156630552D8447A1690CA5DDFB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_205C01156630552D8447A1690CA5DDFB" xlink:to="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_205C01156630552D8447A1690CA5DDFB" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativesFairValueLineItems_291031B35A7E023893266D329711AF33_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativesFairValueLineItems_4E11BDF43847511A8D713C722FB5682E" 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_4E11BDF43847511A8D713C722FB5682E" 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_4E11BDF43847511A8D713C722FB5682E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_4E11BDF43847511A8D713C722FB5682E" xlink:to="lab_us-gaap_DerivativesFairValueLineItems_4E11BDF43847511A8D713C722FB5682E" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_C7DB53603C8327AB77E26D329711FE0B_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_43B4C300A25D5FCE8D75030633CA91EF" 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_43B4C300A25D5FCE8D75030633CA91EF" 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_43B4C300A25D5FCE8D75030633CA91EF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_43B4C300A25D5FCE8D75030633CA91EF" xlink:to="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_43B4C300A25D5FCE8D75030633CA91EF" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_B195A0E55158BFACA9616D3297121B34_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_0323BFC3820F5CE6B2F8626B4587456C" 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_0323BFC3820F5CE6B2F8626B4587456C" 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_0323BFC3820F5CE6B2F8626B4587456C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_0323BFC3820F5CE6B2F8626B4587456C" xlink:to="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_0323BFC3820F5CE6B2F8626B4587456C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0C011750E42384C62AACF747E0BF9AB1_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_68984496842F579D8AFB0B89EE660182" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_68984496842F579D8AFB0B89EE660182" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_68984496842F579D8AFB0B89EE660182" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_68984496842F579D8AFB0B89EE660182" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_B61EBE547F1F097F5635F747E0BF5B6E_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_316EA175C25A56B0AD31D6F427D40BA2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Shares</link:label>
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    <link:label id="lab_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedExcessOfAssetsAcquiredOverLiabilitiesAssumed_A3FAC33FA550B82CCB547221784713C3_label_en-US" xlink:label="lab_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedExcessOfAssetsAcquiredOverLiabilitiesAssumed_EE5C71620783536D920CDB09C478B2A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Excess Of Assets Acquired Over Liabilities Assumed</link:label>
    <link:label id="lab_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedExcessOfAssetsAcquiredOverLiabilitiesAssumed_A3FAC33FA550B82CCB547221784713C3_documentation_en-US" xlink:label="lab_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedExcessOfAssetsAcquiredOverLiabilitiesAssumed_EE5C71620783536D920CDB09C478B2A8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount recognized for assets including goodwill in excess of (less than) the aggregate liabilities assumed.</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedExcessOfAssetsAcquiredOverLiabilitiesAssumed" xlink:label="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedExcessOfAssetsAcquiredOverLiabilitiesAssumed_EE5C71620783536D920CDB09C478B2A8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedExcessOfAssetsAcquiredOverLiabilitiesAssumed_EE5C71620783536D920CDB09C478B2A8" xlink:to="lab_ucbi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedExcessOfAssetsAcquiredOverLiabilitiesAssumed_EE5C71620783536D920CDB09C478B2A8" xlink:type="arc" />
    <link:label id="lab_ucbi_AggregateFairValueAdjustments_8B23C3AA09BC711502D4722178488146_totalLabel_en-US" xlink:label="lab_ucbi_AggregateFairValueAdjustments_94534414320A53039C171876477D3B4E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Aggregate fair value adjustments</link:label>
    <link:label id="lab_ucbi_AggregateFairValueAdjustments_8B23C3AA09BC711502D4722178488146_label_en-US" xlink:label="lab_ucbi_AggregateFairValueAdjustments_94534414320A53039C171876477D3B4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aggregate Fair Value Adjustments</link:label>
    <link:label id="lab_ucbi_AggregateFairValueAdjustments_8B23C3AA09BC711502D4722178488146_documentation_en-US" xlink:label="lab_ucbi_AggregateFairValueAdjustments_94534414320A53039C171876477D3B4E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents aggregate fair value adjustments.</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_AggregateFairValueAdjustments" xlink:label="loc_ucbi_AggregateFairValueAdjustments_94534414320A53039C171876477D3B4E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_AggregateFairValueAdjustments_94534414320A53039C171876477D3B4E" xlink:to="lab_ucbi_AggregateFairValueAdjustments_94534414320A53039C171876477D3B4E" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_9ABC6B5B50AFE349EF1F722178485BDA_totalLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_99450A0382565A2FB7D862C24323F842" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total identifiable net assets</link:label>
    <link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_9ABC6B5B50AFE349EF1F722178485BDA_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_99450A0382565A2FB7D862C24323F842" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_99450A0382565A2FB7D862C24323F842" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_99450A0382565A2FB7D862C24323F842" xlink:to="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_99450A0382565A2FB7D862C24323F842" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesGross_BB96F352F79150A500A372217848CEC7_verboseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesGross_688EDB5674C856E08396766E789B6A61" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash consideration transferred</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesGross_BB96F352F79150A500A372217848CEC7_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesGross_688EDB5674C856E08396766E789B6A61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Businesses, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_688EDB5674C856E08396766E789B6A61" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireBusinessesGross_688EDB5674C856E08396766E789B6A61" xlink:to="lab_us-gaap_PaymentsToAcquireBusinessesGross_688EDB5674C856E08396766E789B6A61" xlink:type="arc" />
    <link:label id="lab_us-gaap_Goodwill_E9B1D7093D81CABA097B72217848ABA0_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_5D3FED5652E85C48A2BF486950CC3C5C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_5D3FED5652E85C48A2BF486950CC3C5C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill_5D3FED5652E85C48A2BF486950CC3C5C" xlink:to="lab_us-gaap_Goodwill_5D3FED5652E85C48A2BF486950CC3C5C" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_6CE6F3D0A8DD1E9E19173C26883F3E1C_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_6CE6F3D0A8DD1E9E19173C26883F3E1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income tax provision</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_6CE6F3D0A8DD1E9E19173C26883F3E1C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_6CE6F3D0A8DD1E9E19173C26883F3E1C" xlink:to="lab_us-gaap_IncomeTaxExpenseBenefit_6CE6F3D0A8DD1E9E19173C26883F3E1C" xlink:type="arc" />
    <link:label id="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_909BCEFE9444490E61123C26883F8B3B_terseLabel_en-US" xlink:label="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_909BCEFE9444490E61123C26883F8B3B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effective tax rate (percent)</link:label>
    <link:label id="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_909BCEFE9444490E61123C26883F8B3B_label_en-US" xlink:label="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_909BCEFE9444490E61123C26883F8B3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_909BCEFE9444490E61123C26883F8B3B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_909BCEFE9444490E61123C26883F8B3B" xlink:to="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_909BCEFE9444490E61123C26883F8B3B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredTaxAssetsValuationAllowance_EFD5AEEE374FA87B057C3C26883F9F90_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsValuationAllowance_EFD5AEEE374FA87B057C3C26883F9F90" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Valuation allowance on deferred tax assets</link:label>
    <link:label id="lab_us-gaap_DeferredTaxAssetsValuationAllowance_EFD5AEEE374FA87B057C3C26883F9F90_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsValuationAllowance_EFD5AEEE374FA87B057C3C26883F9F90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets, Valuation Allowance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_EFD5AEEE374FA87B057C3C26883F9F90" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsValuationAllowance_EFD5AEEE374FA87B057C3C26883F9F90" xlink:to="lab_us-gaap_DeferredTaxAssetsValuationAllowance_EFD5AEEE374FA87B057C3C26883F9F90" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefits_3BA1A48147DDAD90A8943C2688407FFA_verboseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefits_3BA1A48147DDAD90A8943C2688407FFA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized income tax benefits</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefits_3BA1A48147DDAD90A8943C2688407FFA_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefits_3BA1A48147DDAD90A8943C2688407FFA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_3BA1A48147DDAD90A8943C2688407FFA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefits_3BA1A48147DDAD90A8943C2688407FFA" xlink:to="lab_us-gaap_UnrecognizedTaxBenefits_3BA1A48147DDAD90A8943C2688407FFA" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_798B783DE1860E0CCA31F747E46DB8D4_verboseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_032E59EE3FEC5A8CAD2DB32351CFAAB3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of reclassifications out of accumulated other comprehensive income</link:label>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_798B783DE1860E0CCA31F747E46DB8D4_label_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_032E59EE3FEC5A8CAD2DB32351CFAAB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [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_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_032E59EE3FEC5A8CAD2DB32351CFAAB3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_032E59EE3FEC5A8CAD2DB32351CFAAB3" xlink:to="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_032E59EE3FEC5A8CAD2DB32351CFAAB3" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_98283A4960D1CD8526E2F747E31F3447_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_1EE37FC543AB5E7694DEBD0C4BA70808" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_98283A4960D1CD8526E2F747E31F3447_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_1EE37FC543AB5E7694DEBD0C4BA70808" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_1EE37FC543AB5E7694DEBD0C4BA70808" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_1EE37FC543AB5E7694DEBD0C4BA70808" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_1EE37FC543AB5E7694DEBD0C4BA70808" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_80C4E016003FF9DAC777F747E3223071_terseLabel_en-US" xlink:label="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_D22DD9BF4FEB5ACBA69AAABCD0DFEE10" 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_D22DD9BF4FEB5ACBA69AAABCD0DFEE10" 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_D22DD9BF4FEB5ACBA69AAABCD0DFEE10" 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-20190930.xsd#ucbi_DerivativeLiabilitiesRiskParticipationsMember" xlink:label="loc_ucbi_DerivativeLiabilitiesRiskParticipationsMember_D22DD9BF4FEB5ACBA69AAABCD0DFEE10" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeLiabilitiesRiskParticipationsMember_D22DD9BF4FEB5ACBA69AAABCD0DFEE10" xlink:to="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_D22DD9BF4FEB5ACBA69AAABCD0DFEE10" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeLiabilityMember_1BB34444CCDB4C03B182F747E32236A4_terseLabel_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_A901D17D0EC955209C139D73C9809984" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative liabilities - other</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_DerivativeLiabilityMember" xlink:label="loc_ucbi_DerivativeLiabilityMember_A901D17D0EC955209C139D73C9809984" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeLiabilityMember_A901D17D0EC955209C139D73C9809984" xlink:to="lab_ucbi_DerivativeLiabilityMember_A901D17D0EC955209C139D73C9809984" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeAssetMember_6593EC203823B3E53C90F747E323DE9A_terseLabel_en-US" xlink:label="lab_ucbi_DerivativeAssetMember_D17E20DFADE5585F8B47519B86EA3B6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative assets - mortgage</link:label>
    <link:loc xlink:href="ucbi-20190930.xsd#ucbi_DerivativeAssetMember" xlink:label="loc_ucbi_DerivativeAssetMember_D17E20DFADE5585F8B47519B86EA3B6C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeAssetMember_D17E20DFADE5585F8B47519B86EA3B6C" xlink:to="lab_ucbi_DerivativeAssetMember_D17E20DFADE5585F8B47519B86EA3B6C" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeAssetsOtherMember_42B775CC8CCEFD38589FF747E3236F43_verboseLabel_en-US" xlink:label="lab_ucbi_DerivativeAssetsOtherMember_959580FBAC3E5718ADFEC4D4B18A9EAD" 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_959580FBAC3E5718ADFEC4D4B18A9EAD" 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_959580FBAC3E5718ADFEC4D4B18A9EAD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information about Derivative assets other.</link:label>
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