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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_9621CD56EE0BA4D9C8C488DAFDBF0CC9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_9621CD56EE0BA4D9C8C488DAFDBF0CC9" xlink:to="lab_us-gaap_DerivativeContractTypeDomain_9621CD56EE0BA4D9C8C488DAFDBF0CC9" xlink:type="arc" />
    <link:label id="lab_ucbi_CustomerSwapPositionMember_663078066005DA7FDB8488DAFDBFB2F7_verboseLabel_en-US" xlink:label="lab_ucbi_CustomerSwapPositionMember_663078066005DA7FDB8488DAFDBFB2F7" 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_663078066005DA7FDB8488DAFDBFB2F7_label_en-US" xlink:label="lab_ucbi_CustomerSwapPositionMember_663078066005DA7FDB8488DAFDBFB2F7" 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_663078066005DA7FDB8488DAFDBFB2F7_documentation_en-US" xlink:label="lab_ucbi_CustomerSwapPositionMember_663078066005DA7FDB8488DAFDBFB2F7" 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-20190331.xsd#ucbi_CustomerSwapPositionMember" xlink:label="loc_ucbi_CustomerSwapPositionMember_663078066005DA7FDB8488DAFDBFB2F7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_CustomerSwapPositionMember_663078066005DA7FDB8488DAFDBFB2F7" xlink:to="lab_ucbi_CustomerSwapPositionMember_663078066005DA7FDB8488DAFDBFB2F7" xlink:type="arc" />
    <link:label id="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_889FB2DCB4A2108E6AE588DAFDC0D7F4_verboseLabel_en-US" xlink:label="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_889FB2DCB4A2108E6AE588DAFDC0D7F4" 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_889FB2DCB4A2108E6AE588DAFDC0D7F4_label_en-US" xlink:label="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_889FB2DCB4A2108E6AE588DAFDC0D7F4" 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_889FB2DCB4A2108E6AE588DAFDC0D7F4_documentation_en-US" xlink:label="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_889FB2DCB4A2108E6AE588DAFDC0D7F4" 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-20190331.xsd#ucbi_DealerOffsetToCustomerSwapPositionMember" xlink:label="loc_ucbi_DealerOffsetToCustomerSwapPositionMember_889FB2DCB4A2108E6AE588DAFDC0D7F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DealerOffsetToCustomerSwapPositionMember_889FB2DCB4A2108E6AE588DAFDC0D7F4" xlink:to="lab_ucbi_DealerOffsetToCustomerSwapPositionMember_889FB2DCB4A2108E6AE588DAFDC0D7F4" xlink:type="arc" />
    <link:label id="lab_ucbi_RiskParticipationsMember_684A594D932EA1980CDC88DAFDC011F6_verboseLabel_en-US" xlink:label="lab_ucbi_RiskParticipationsMember_684A594D932EA1980CDC88DAFDC011F6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Risk participations</link:label>
    <link:label id="lab_ucbi_RiskParticipationsMember_684A594D932EA1980CDC88DAFDC011F6_label_en-US" xlink:label="lab_ucbi_RiskParticipationsMember_684A594D932EA1980CDC88DAFDC011F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Risk Participations [Member]</link:label>
    <link:label id="lab_ucbi_RiskParticipationsMember_684A594D932EA1980CDC88DAFDC011F6_documentation_en-US" xlink:label="lab_ucbi_RiskParticipationsMember_684A594D932EA1980CDC88DAFDC011F6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information about risk participations.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_RiskParticipationsMember" xlink:label="loc_ucbi_RiskParticipationsMember_684A594D932EA1980CDC88DAFDC011F6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RiskParticipationsMember_684A594D932EA1980CDC88DAFDC011F6" xlink:to="lab_ucbi_RiskParticipationsMember_684A594D932EA1980CDC88DAFDC011F6" xlink:type="arc" />
    <link:label id="lab_ucbi_MortgageBankingLoanCommitmentMember_CE3323D3A374BDC71C9088DAFDC0DE7A_verboseLabel_en-US" xlink:label="lab_ucbi_MortgageBankingLoanCommitmentMember_CE3323D3A374BDC71C9088DAFDC0DE7A" 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_CE3323D3A374BDC71C9088DAFDC0DE7A_label_en-US" xlink:label="lab_ucbi_MortgageBankingLoanCommitmentMember_CE3323D3A374BDC71C9088DAFDC0DE7A" 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_CE3323D3A374BDC71C9088DAFDC0DE7A_documentation_en-US" xlink:label="lab_ucbi_MortgageBankingLoanCommitmentMember_CE3323D3A374BDC71C9088DAFDC0DE7A" 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-20190331.xsd#ucbi_MortgageBankingLoanCommitmentMember" xlink:label="loc_ucbi_MortgageBankingLoanCommitmentMember_CE3323D3A374BDC71C9088DAFDC0DE7A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_MortgageBankingLoanCommitmentMember_CE3323D3A374BDC71C9088DAFDC0DE7A" xlink:to="lab_ucbi_MortgageBankingLoanCommitmentMember_CE3323D3A374BDC71C9088DAFDC0DE7A" xlink:type="arc" />
    <link:label id="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_9DDA65F95EBA94AC416288DAFDC017B6_verboseLabel_en-US" xlink:label="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_9DDA65F95EBA94AC416288DAFDC017B6" 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_9DDA65F95EBA94AC416288DAFDC017B6_label_en-US" xlink:label="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_9DDA65F95EBA94AC416288DAFDC017B6" 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_9DDA65F95EBA94AC416288DAFDC017B6_documentation_en-US" xlink:label="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_9DDA65F95EBA94AC416288DAFDC017B6" 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-20190331.xsd#ucbi_MortgageBankingForwardSalesCommitmentMember" xlink:label="loc_ucbi_MortgageBankingForwardSalesCommitmentMember_9DDA65F95EBA94AC416288DAFDC017B6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_MortgageBankingForwardSalesCommitmentMember_9DDA65F95EBA94AC416288DAFDC017B6" xlink:to="lab_ucbi_MortgageBankingForwardSalesCommitmentMember_9DDA65F95EBA94AC416288DAFDC017B6" xlink:type="arc" />
    <link:label id="lab_ucbi_BifurcatedEmbeddedDerivativeMember_8CA4823F9B5615D27E6E88DAFDC0153A_verboseLabel_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativeMember_8CA4823F9B5615D27E6E88DAFDC0153A" 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_8CA4823F9B5615D27E6E88DAFDC0153A_label_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativeMember_8CA4823F9B5615D27E6E88DAFDC0153A" 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_8CA4823F9B5615D27E6E88DAFDC0153A_documentation_en-US" xlink:label="lab_ucbi_BifurcatedEmbeddedDerivativeMember_8CA4823F9B5615D27E6E88DAFDC0153A" 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-20190331.xsd#ucbi_BifurcatedEmbeddedDerivativeMember" xlink:label="loc_ucbi_BifurcatedEmbeddedDerivativeMember_8CA4823F9B5615D27E6E88DAFDC0153A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_BifurcatedEmbeddedDerivativeMember_8CA4823F9B5615D27E6E88DAFDC0153A" xlink:to="lab_ucbi_BifurcatedEmbeddedDerivativeMember_8CA4823F9B5615D27E6E88DAFDC0153A" xlink:type="arc" />
    <link:label id="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_447B3C74640E00E4476688DAFDC17A1A_verboseLabel_en-US" xlink:label="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_447B3C74640E00E4476688DAFDC17A1A" 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_447B3C74640E00E4476688DAFDC17A1A_label_en-US" xlink:label="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_447B3C74640E00E4476688DAFDC17A1A" 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_447B3C74640E00E4476688DAFDC17A1A_documentation_en-US" xlink:label="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_447B3C74640E00E4476688DAFDC17A1A" 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-20190331.xsd#ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember" xlink:label="loc_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_447B3C74640E00E4476688DAFDC17A1A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_447B3C74640E00E4476688DAFDC17A1A" xlink:to="lab_ucbi_DealerOffsetsToBifurcatedEmbeddedDerivativesMember_447B3C74640E00E4476688DAFDC17A1A" xlink:type="arc" />
    <link:label id="lab_ucbi_DeDesignatedCashFlowHedgeMember_68BB29C5B9E2C0FADE0B88DAFDC1F6BE_terseLabel_en-US" xlink:label="lab_ucbi_DeDesignatedCashFlowHedgeMember_68BB29C5B9E2C0FADE0B88DAFDC1F6BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">De-designated hedges</link:label>
    <link:label id="lab_ucbi_DeDesignatedCashFlowHedgeMember_68BB29C5B9E2C0FADE0B88DAFDC1F6BE_label_en-US" xlink:label="lab_ucbi_DeDesignatedCashFlowHedgeMember_68BB29C5B9E2C0FADE0B88DAFDC1F6BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">De Designated Cash Flow Hedge [Member]</link:label>
    <link:label id="lab_ucbi_DeDesignatedCashFlowHedgeMember_68BB29C5B9E2C0FADE0B88DAFDC1F6BE_documentation_en-US" xlink:label="lab_ucbi_DeDesignatedCashFlowHedgeMember_68BB29C5B9E2C0FADE0B88DAFDC1F6BE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents de-designated cash flow hedge.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DeDesignatedCashFlowHedgeMember" xlink:label="loc_ucbi_DeDesignatedCashFlowHedgeMember_68BB29C5B9E2C0FADE0B88DAFDC1F6BE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DeDesignatedCashFlowHedgeMember_68BB29C5B9E2C0FADE0B88DAFDC1F6BE" xlink:to="lab_ucbi_DeDesignatedCashFlowHedgeMember_68BB29C5B9E2C0FADE0B88DAFDC1F6BE" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativesFairValueLineItems_660674B809887FEF394D88DAFDC185BD_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativesFairValueLineItems_660674B809887FEF394D88DAFDC185BD" 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_660674B809887FEF394D88DAFDC185BD_label_en-US" xlink:label="lab_us-gaap_DerivativesFairValueLineItems_660674B809887FEF394D88DAFDC185BD" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_660674B809887FEF394D88DAFDC185BD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_660674B809887FEF394D88DAFDC185BD" xlink:to="lab_us-gaap_DerivativesFairValueLineItems_660674B809887FEF394D88DAFDC185BD" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_CF8CC2F3B5572B4DD78D88DAFDC14C4F_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_CF8CC2F3B5572B4DD78D88DAFDC14C4F" 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_CF8CC2F3B5572B4DD78D88DAFDC14C4F_label_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_CF8CC2F3B5572B4DD78D88DAFDC14C4F" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_CF8CC2F3B5572B4DD78D88DAFDC14C4F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_CF8CC2F3B5572B4DD78D88DAFDC14C4F" xlink:to="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_CF8CC2F3B5572B4DD78D88DAFDC14C4F" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_17925BFFCE46A1B6888A88DAFDC1BEB6_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_17925BFFCE46A1B6888A88DAFDC1BEB6" 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_17925BFFCE46A1B6888A88DAFDC1BEB6_label_en-US" xlink:label="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_17925BFFCE46A1B6888A88DAFDC1BEB6" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_17925BFFCE46A1B6888A88DAFDC1BEB6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_17925BFFCE46A1B6888A88DAFDC1BEB6" xlink:to="lab_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_17925BFFCE46A1B6888A88DAFDC1BEB6" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_FB87CD520AC7BB940DFD98C1A0DE1ABB_label_en-US" xlink:label="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_FB87CD520AC7BB940DFD98C1A0DE1ABB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Comprehensive Income [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_FB87CD520AC7BB940DFD98C1A0DE1ABB" xlink:type="locator" />
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_13C1522E2258F7196B5F98C1A0E15CD6_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesBeforeTax_13C1522E2258F7196B5F98C1A0E15CD6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount before tax related to amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges.</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_32D461B3F6E5B3AF5BA098C1A0E176B0_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesTax_32D461B3F6E5B3AF5BA098C1A0E176B0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of tax expense (benefit) related to amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges.</link:label>
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    <link:label id="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_918C90B10759B0B457AC98C1A0E10662_documentation_en-US" xlink:label="lab_ucbi_OtherComprehensiveIncomeLossAmortizationOfLossesIncludedInNetIncomeOnTerminatedDerivativeFinancialInstrumentsWhichPreviouslyAccountedForAsCashFlowHedgesNetOfTax_918C90B10759B0B457AC98C1A0E10662" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount after tax related to amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaap_WarrantMember_3DBDC2065DDBA16EF7C2895626CC8C11" xlink:type="locator" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_9B967AD96BE7DFF1C4258958A402BABE" xlink:to="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_9B967AD96BE7DFF1C4258958A402BABE" xlink:type="arc" />
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_A47A4420C8B7B4F5261B8954C8D53983_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_A47A4420C8B7B4F5261B8954C8D53983" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Antidilutive securities excluded from computation (in shares)</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_E7F8C6F1211DC38393B388DAFDD80756_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_E7F8C6F1211DC38393B388DAFDD80756" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of stock options (in dollars per share)</link:label>
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    <link:label id="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_8A792BB778ACC0498DD888DAFDD778B6_verboseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_8A792BB778ACC0498DD888DAFDD778B6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Exercise price of warrants (in dollars per share)</link:label>
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    <link:label id="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_0B6F02672253E21523C0E11E4B24393D_verboseLabel_en-US" xlink:label="lab_us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross_85C7FFDE56335B3FA9F3C6CEEF6C6136" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts of recognized assets</link:label>
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    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_3C0B99664738901DCFC5E11E4B25F67C_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_DBF61BA60323567D92F6B212278139C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Repurchase agreements / reverse repurchase agreements, gross amounts not offset in balance sheet assets of financial instruments</link:label>
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    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_3C0B99664738901DCFC5E11E4B25F67C_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfFinancialInstruments_DBF61BA60323567D92F6B212278139C4" 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_EB1C46DE756068A168F0E11E4B255EB6_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetAssetsOfCollateralReceived_24335E0F721455E48D8A31C9763B62DE" 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_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_FE8FBE795CE8BE2C726FE11E4B276D37_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross_35FFE4F17F705729A7DD931D0073D78F" 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>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability_453A063313375D2784101763FD34B3E4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_A3A52641E8D0A7DE1FB8E11E4B276AEB_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_7E82F42BD9A659D4B05E2D1835C5539E" 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_A3A52641E8D0A7DE1FB8E11E4B276AEB_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_7E82F42BD9A659D4B05E2D1835C5539E" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed" xlink:label="loc_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed_7E82F42BD9A659D4B05E2D1835C5539E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_786270930FADF4C8F7FBE11E4B27FDC1_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction_DA03252A849F5142858E27D16071D430" 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>
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral_FCF11897294F8E03B118E11E4B28A2FF_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral_4B0E5B9FAC6950D6B0FA0EBDF3BF62CD" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Offsetting assets, gross amounts not offset in the balance sheet of collateral received</link:label>
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    <link:label id="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_EFDE2BEC26C23C515148E11E4B282EE9_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_A15DEE1F42CE5E7BB6B325BED61435ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Offsetting assets, net amount</link:label>
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    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_WeightedAverageInterestRateOfReverseRepurchaseAgreementsAssets" xlink:label="loc_ucbi_WeightedAverageInterestRateOfReverseRepurchaseAgreementsAssets_77F1B8CA13295E7DA7551C5DCD2ED453" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_0D9EE10F31F94F1E618FE11E4B28EA2B_verboseLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_857B45A4B4155C85B7772E42FD6F8C92" 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>
    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_0D9EE10F31F94F1E618FE11E4B28EA2B_label_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_857B45A4B4155C85B7772E42FD6F8C92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Securities Sold under Agreements to Repurchase, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_857B45A4B4155C85B7772E42FD6F8C92" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_857B45A4B4155C85B7772E42FD6F8C92" xlink:to="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross_857B45A4B4155C85B7772E42FD6F8C92" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_C6E182A055D81A0D7F4BE11E4B28F8C1_negatedLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_5C58FC1699DF53A195E138E94DF8F1E4" 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_C6E182A055D81A0D7F4BE11E4B28F8C1_label_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_5C58FC1699DF53A195E138E94DF8F1E4" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_5C58FC1699DF53A195E138E94DF8F1E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_5C58FC1699DF53A195E138E94DF8F1E4" xlink:to="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset_5C58FC1699DF53A195E138E94DF8F1E4" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_CF7F2DC7D227A329C2B4E11E4B281D0B_totalLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_E7CBE7880D235B11AA3FDFE93CF67C65" 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_CF7F2DC7D227A329C2B4E11E4B281D0B_label_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_E7CBE7880D235B11AA3FDFE93CF67C65" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_E7CBE7880D235B11AA3FDFE93CF67C65" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_E7CBE7880D235B11AA3FDFE93CF67C65" xlink:to="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_E7CBE7880D235B11AA3FDFE93CF67C65" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_1CA3C4EA0093B9F94E04E11E4B2946FF_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5188A022B00D5D9282C76397BF97C48F" 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_1CA3C4EA0093B9F94E04E11E4B2946FF_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5188A022B00D5D9282C76397BF97C48F" 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_1CA3C4EA0093B9F94E04E11E4B2946FF_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5188A022B00D5D9282C76397BF97C48F" 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-20190331.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5188A022B00D5D9282C76397BF97C48F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5188A022B00D5D9282C76397BF97C48F" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfFinancialInstruments_5188A022B00D5D9282C76397BF97C48F" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_83862EAEBA3186D53D39E11E4B297ACB_terseLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_7ED517E3C0F557FBB902E42F578C1FD3" 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_83862EAEBA3186D53D39E11E4B297ACB_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_7ED517E3C0F557FBB902E42F578C1FD3" 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_83862EAEBA3186D53D39E11E4B297ACB_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_7ED517E3C0F557FBB902E42F578C1FD3" 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-20190331.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_7ED517E3C0F557FBB902E42F578C1FD3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_7ED517E3C0F557FBB902E42F578C1FD3" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsGrossAmountsNotOffSetInBalanceSheetLiabilitiesOfCollateralPledged_7ED517E3C0F557FBB902E42F578C1FD3" xlink:type="arc" />
    <link:label id="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_21E80FBA9ED56E0CE61AE11E4B29FB6A_totalLabel_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_8B4B763C76DF5B26905986A073854E3C" 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_21E80FBA9ED56E0CE61AE11E4B29FB6A_label_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_8B4B763C76DF5B26905986A073854E3C" 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_21E80FBA9ED56E0CE61AE11E4B29FB6A_documentation_en-US" xlink:label="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_8B4B763C76DF5B26905986A073854E3C" 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-20190331.xsd#ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities" xlink:label="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_8B4B763C76DF5B26905986A073854E3C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_8B4B763C76DF5B26905986A073854E3C" xlink:to="lab_ucbi_RepurchaseAndReverseRepurchaseAgreementsNetLiabilities_8B4B763C76DF5B26905986A073854E3C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_AD195F46AB8418412571E11E4B29BFD5_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_33BD5C5DEE475D9D878164FBF5A487C5" 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_AD195F46AB8418412571E11E4B29BFD5_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_33BD5C5DEE475D9D878164FBF5A487C5" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_33BD5C5DEE475D9D878164FBF5A487C5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_33BD5C5DEE475D9D878164FBF5A487C5" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_33BD5C5DEE475D9D878164FBF5A487C5" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_48093F9A5EA97BFF5B7DE11E4B29B12C_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_4BF1F2242459517E92993D874137AF10" 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_48093F9A5EA97BFF5B7DE11E4B29B12C_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_4BF1F2242459517E92993D874137AF10" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_4BF1F2242459517E92993D874137AF10" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_4BF1F2242459517E92993D874137AF10" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_4BF1F2242459517E92993D874137AF10" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_10D5A89C1270E5FAA707E11E4B2AF421_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_9DCB58ADCA835E14AF1A8EA1854155F5" 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_10D5A89C1270E5FAA707E11E4B2AF421_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_9DCB58ADCA835E14AF1A8EA1854155F5" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_9DCB58ADCA835E14AF1A8EA1854155F5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_9DCB58ADCA835E14AF1A8EA1854155F5" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_9DCB58ADCA835E14AF1A8EA1854155F5" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_BDCBA517AE0C810BA7EBE11E4B2A5539_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_6CE16EFF31B0592D82A1388B9070635A" 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_BDCBA517AE0C810BA7EBE11E4B2A5539_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_6CE16EFF31B0592D82A1388B9070635A" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction" xlink:label="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_6CE16EFF31B0592D82A1388B9070635A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_6CE16EFF31B0592D82A1388B9070635A" xlink:to="lab_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_6CE16EFF31B0592D82A1388B9070635A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_7B8DF4F6435984985266E11E4B2A343B_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_6523175D17BA5337924CC6F3DF53F60D" 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_7B8DF4F6435984985266E11E4B2A343B_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_6523175D17BA5337924CC6F3DF53F60D" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOfCollateral" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_6523175D17BA5337924CC6F3DF53F60D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOfCollateral_6523175D17BA5337924CC6F3DF53F60D" xlink:to="lab_us-gaap_DerivativeLiabilityFairValueOfCollateral_6523175D17BA5337924CC6F3DF53F60D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_67C765302A7A25551CD3E11E4B2AE768_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_BCF5D21F2BF75F12A19B12E96F6EB4BD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivatives, net amount</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_67C765302A7A25551CD3E11E4B2AE768_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_BCF5D21F2BF75F12A19B12E96F6EB4BD" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_BCF5D21F2BF75F12A19B12E96F6EB4BD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_6D38DC0C5F1C864ED1E9E11E4B2AF202_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_23211CEC3344501483B3FC8298674278" 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>
    <link:label id="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_6D38DC0C5F1C864ED1E9E11E4B2AF202_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross_23211CEC3344501483B3FC8298674278" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross</link:label>
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    <link:label id="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned_25F1660149D186E0211AE11E4B2BCBB3_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned_82600E5A61FF5B6CAD3F0E2B2B547A8F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned</link:label>
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    <link:label id="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotOffsetPolicyElectionDeduction_6EB38B497D0D01D9852AE11E4B2B8F9A_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotOffsetPolicyElectionDeduction_C8252433B15B583292A8CAAE7BE2C0F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Not Offset, Policy Election Deduction</link:label>
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    <link:label id="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral_E955A6ACBE96D723524CE11E4B2BEAFD_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral_A4F2D2A6720D5A3BB0A368EDC80F3AF7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Offsetting liabilities, gross amounts not offset in the balance sheet of collateral pledged</link:label>
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    <link:label id="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_5AB2379FE85C5C046951E11E4B2BC1E1_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_11BF975A2685526C97B41C68C903DCD1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_11BF975A2685526C97B41C68C903DCD1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueOptionChangesInFairValueGainLoss1_259BE3A2431F7460A33B98C19EC78CA8_verboseLabel_en-US" xlink:label="lab_us-gaap_FairValueOptionChangesInFairValueGainLoss1_259BE3A2431F7460A33B98C19EC78CA8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net gains (losses) from changes in fair value of loans</link:label>
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    <link:label id="lab_us-gaap_ReceivablesAbstract_E28F7518897CAD7FF4C488DAFE74FFBA_label_en-US" xlink:label="lab_us-gaap_ReceivablesAbstract_E28F7518897CAD7FF4C488DAFE74FFBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivables [Abstract]</link:label>
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    <link:label id="lab_us-gaap_LoansReceivableMember_55FC9347536E903AC4EB88DAFE75B587_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansReceivableMember_55FC9347536E903AC4EB88DAFE75B587" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loans Receivable</link:label>
    <link:label id="lab_us-gaap_LoansReceivableMember_55FC9347536E903AC4EB88DAFE75B587_label_en-US" xlink:label="lab_us-gaap_LoansReceivableMember_55FC9347536E903AC4EB88DAFE75B587" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans Receivable [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansReceivableMember" xlink:label="loc_us-gaap_LoansReceivableMember_55FC9347536E903AC4EB88DAFE75B587" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FinancingReceivablePortfolioSegmentAxis_FCC1C05D409D85EC924188DAFE753B66_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivablePortfolioSegmentAxis_FCC1C05D409D85EC924188DAFE753B66" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financing Receivable Portfolio Segment [Axis]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivablePortfolioSegmentAxis_FCC1C05D409D85EC924188DAFE753B66_label_en-US" xlink:label="lab_us-gaap_FinancingReceivablePortfolioSegmentAxis_FCC1C05D409D85EC924188DAFE753B66" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable Portfolio Segment [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_FCC1C05D409D85EC924188DAFE753B66" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FinancingReceivablePortfolioSegmentDomain_0D8D17DAD00994008D4D88DAFE75385F_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivablePortfolioSegmentDomain_0D8D17DAD00994008D4D88DAFE75385F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financing Receivable Portfolio Segment [Domain]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivablePortfolioSegmentDomain_0D8D17DAD00994008D4D88DAFE75385F_label_en-US" xlink:label="lab_us-gaap_FinancingReceivablePortfolioSegmentDomain_0D8D17DAD00994008D4D88DAFE75385F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable Portfolio Segment [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_0D8D17DAD00994008D4D88DAFE75385F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CommercialPortfolioSegmentMember_21A39AB9529E041482F488DAFE75D636_terseLabel_en-US" xlink:label="lab_us-gaap_CommercialPortfolioSegmentMember_21A39AB9529E041482F488DAFE75D636" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial</link:label>
    <link:label id="lab_us-gaap_CommercialPortfolioSegmentMember_21A39AB9529E041482F488DAFE75D636_label_en-US" xlink:label="lab_us-gaap_CommercialPortfolioSegmentMember_21A39AB9529E041482F488DAFE75D636" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommercialPortfolioSegmentMember" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_21A39AB9529E041482F488DAFE75D636" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommercialPortfolioSegmentMember_21A39AB9529E041482F488DAFE75D636" xlink:to="lab_us-gaap_CommercialPortfolioSegmentMember_21A39AB9529E041482F488DAFE75D636" xlink:type="arc" />
    <link:label id="lab_us-gaap_ResidentialPortfolioSegmentMember_19BF70AEB982F5970E5588DAFE761CA2_terseLabel_en-US" xlink:label="lab_us-gaap_ResidentialPortfolioSegmentMember_19BF70AEB982F5970E5588DAFE761CA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential</link:label>
    <link:label id="lab_us-gaap_ResidentialPortfolioSegmentMember_19BF70AEB982F5970E5588DAFE761CA2_label_en-US" xlink:label="lab_us-gaap_ResidentialPortfolioSegmentMember_19BF70AEB982F5970E5588DAFE761CA2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_19BF70AEB982F5970E5588DAFE761CA2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResidentialPortfolioSegmentMember_19BF70AEB982F5970E5588DAFE761CA2" xlink:to="lab_us-gaap_ResidentialPortfolioSegmentMember_19BF70AEB982F5970E5588DAFE761CA2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConsumerPortfolioSegmentMember_B07AFD94541021C2452E88DAFE7632D7_terseLabel_en-US" xlink:label="lab_us-gaap_ConsumerPortfolioSegmentMember_B07AFD94541021C2452E88DAFE7632D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consumer direct</link:label>
    <link:label id="lab_us-gaap_ConsumerPortfolioSegmentMember_B07AFD94541021C2452E88DAFE7632D7_label_en-US" xlink:label="lab_us-gaap_ConsumerPortfolioSegmentMember_B07AFD94541021C2452E88DAFE7632D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consumer Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_B07AFD94541021C2452E88DAFE7632D7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsumerPortfolioSegmentMember_B07AFD94541021C2452E88DAFE7632D7" xlink:to="lab_us-gaap_ConsumerPortfolioSegmentMember_B07AFD94541021C2452E88DAFE7632D7" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3E0130DD7319A5C6164988DAFE7760F7_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3E0130DD7319A5C6164988DAFE7760F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable, Type [Axis]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3E0130DD7319A5C6164988DAFE7760F7_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3E0130DD7319A5C6164988DAFE7760F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable, Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3E0130DD7319A5C6164988DAFE7760F7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_71CB3BE36EAECD3B775088DAFE77DD86_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_71CB3BE36EAECD3B775088DAFE77DD86" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_71CB3BE36EAECD3B775088DAFE77DD86_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_71CB3BE36EAECD3B775088DAFE77DD86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_71CB3BE36EAECD3B775088DAFE77DD86" xlink:type="locator" />
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    <link:label id="lab_ucbi_OwnerOccupiedCommercialRealEstateMember_6E51F82A00B856AC212F88DAFE77678D_verboseLabel_en-US" xlink:label="lab_ucbi_OwnerOccupiedCommercialRealEstateMember_6E51F82A00B856AC212F88DAFE77678D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Owner occupied commercial real estate</link:label>
    <link:label id="lab_ucbi_OwnerOccupiedCommercialRealEstateMember_6E51F82A00B856AC212F88DAFE77678D_label_en-US" xlink:label="lab_ucbi_OwnerOccupiedCommercialRealEstateMember_6E51F82A00B856AC212F88DAFE77678D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Owner Occupied Commercial Real Estate [Member]</link:label>
    <link:label id="lab_ucbi_OwnerOccupiedCommercialRealEstateMember_6E51F82A00B856AC212F88DAFE77678D_documentation_en-US" xlink:label="lab_ucbi_OwnerOccupiedCommercialRealEstateMember_6E51F82A00B856AC212F88DAFE77678D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information of owner occupied commercial real estate.</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_OwnerOccupiedCommercialRealEstateMember_6E51F82A00B856AC212F88DAFE77678D" xlink:to="lab_ucbi_OwnerOccupiedCommercialRealEstateMember_6E51F82A00B856AC212F88DAFE77678D" xlink:type="arc" />
    <link:label id="lab_ucbi_IncomeProducingCommercialRealEstateMember_17ABBE2C9EC92B88376688DAFE77188A_verboseLabel_en-US" xlink:label="lab_ucbi_IncomeProducingCommercialRealEstateMember_17ABBE2C9EC92B88376688DAFE77188A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income producing commercial real estate</link:label>
    <link:label id="lab_ucbi_IncomeProducingCommercialRealEstateMember_17ABBE2C9EC92B88376688DAFE77188A_label_en-US" xlink:label="lab_ucbi_IncomeProducingCommercialRealEstateMember_17ABBE2C9EC92B88376688DAFE77188A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Producing Commercial Real Estate [Member]</link:label>
    <link:label id="lab_ucbi_IncomeProducingCommercialRealEstateMember_17ABBE2C9EC92B88376688DAFE77188A_documentation_en-US" xlink:label="lab_ucbi_IncomeProducingCommercialRealEstateMember_17ABBE2C9EC92B88376688DAFE77188A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Property that represents income producing commercial real estate.</link:label>
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    <link:label id="lab_ucbi_CommercialAndIndustrialClassificationMember_CB070FBFA4D42A57854C89251283404B_terseLabel_en-US" xlink:label="lab_ucbi_CommercialAndIndustrialClassificationMember_CB070FBFA4D42A57854C89251283404B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial &amp; industrial</link:label>
    <link:label id="lab_ucbi_CommercialAndIndustrialClassificationMember_CB070FBFA4D42A57854C89251283404B_label_en-US" xlink:label="lab_ucbi_CommercialAndIndustrialClassificationMember_CB070FBFA4D42A57854C89251283404B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial And Industrial Classification [Member]</link:label>
    <link:label id="lab_ucbi_CommercialAndIndustrialClassificationMember_CB070FBFA4D42A57854C89251283404B_documentation_en-US" xlink:label="lab_ucbi_CommercialAndIndustrialClassificationMember_CB070FBFA4D42A57854C89251283404B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Commercial And Industrial Classification[Member]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_CommercialAndIndustrialClassificationMember_CB070FBFA4D42A57854C89251283404B" xlink:to="lab_ucbi_CommercialAndIndustrialClassificationMember_CB070FBFA4D42A57854C89251283404B" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConstructionLoansMember_51AE4505A334AC91092D88DAFE770CA3_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionLoansMember_51AE4505A334AC91092D88DAFE770CA3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction</link:label>
    <link:label id="lab_us-gaap_ConstructionLoansMember_51AE4505A334AC91092D88DAFE770CA3_label_en-US" xlink:label="lab_us-gaap_ConstructionLoansMember_51AE4505A334AC91092D88DAFE770CA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction Loans [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConstructionLoansMember" xlink:label="loc_us-gaap_ConstructionLoansMember_51AE4505A334AC91092D88DAFE770CA3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConstructionLoansMember_51AE4505A334AC91092D88DAFE770CA3" xlink:to="lab_us-gaap_ConstructionLoansMember_51AE4505A334AC91092D88DAFE770CA3" xlink:type="arc" />
    <link:label id="lab_ucbi_EquipmentFinancingMember_8A481F0D3CDF840A06D388DAFE7854DE_terseLabel_en-US" xlink:label="lab_ucbi_EquipmentFinancingMember_8A481F0D3CDF840A06D388DAFE7854DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equipment financing</link:label>
    <link:label id="lab_ucbi_EquipmentFinancingMember_8A481F0D3CDF840A06D388DAFE7854DE_label_en-US" xlink:label="lab_ucbi_EquipmentFinancingMember_8A481F0D3CDF840A06D388DAFE7854DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equipment Financing [Member]</link:label>
    <link:label id="lab_ucbi_EquipmentFinancingMember_8A481F0D3CDF840A06D388DAFE7854DE_documentation_en-US" xlink:label="lab_ucbi_EquipmentFinancingMember_8A481F0D3CDF840A06D388DAFE7854DE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information related to equipment financing.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_EquipmentFinancingMember" xlink:label="loc_ucbi_EquipmentFinancingMember_8A481F0D3CDF840A06D388DAFE7854DE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_EquipmentFinancingMember_8A481F0D3CDF840A06D388DAFE7854DE" xlink:to="lab_ucbi_EquipmentFinancingMember_8A481F0D3CDF840A06D388DAFE7854DE" xlink:type="arc" />
    <link:label id="lab_us-gaap_ResidentialMortgageMember_1C5F98578FC1E63A32AE88DAFE78B0AC_verboseLabel_en-US" xlink:label="lab_us-gaap_ResidentialMortgageMember_1C5F98578FC1E63A32AE88DAFE78B0AC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage</link:label>
    <link:label id="lab_us-gaap_ResidentialMortgageMember_1C5F98578FC1E63A32AE88DAFE78B0AC_label_en-US" xlink:label="lab_us-gaap_ResidentialMortgageMember_1C5F98578FC1E63A32AE88DAFE78B0AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResidentialMortgageMember" xlink:label="loc_us-gaap_ResidentialMortgageMember_1C5F98578FC1E63A32AE88DAFE78B0AC" xlink:type="locator" />
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    <link:label id="lab_ucbi_GainsFromSalesOfGovernmentGuaranteedLoans_23E7AABBF4B375DB09F9984F6A0BBF4D_documentation_en-US" xlink:label="lab_ucbi_GainsFromSalesOfGovernmentGuaranteedLoans_23E7AABBF4B375DB09F9984F6A0BBF4D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of gain or loss from sale of government guaranteed loans.</link:label>
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    <link:label id="lab_us-gaap_GainsLossesOnSalesOfOtherRealEstate_F2D523F166548C550083984F6A0BD0AB_negatedLabel_en-US" xlink:label="lab_us-gaap_GainsLossesOnSalesOfOtherRealEstate_F2D523F166548C550083984F6A0BD0AB" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net (gains) losses and write downs on sales of other real estate owned</link:label>
    <link:label id="lab_us-gaap_GainsLossesOnSalesOfOtherRealEstate_F2D523F166548C550083984F6A0BD0AB_label_en-US" xlink:label="lab_us-gaap_GainsLossesOnSalesOfOtherRealEstate_F2D523F166548C550083984F6A0BD0AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gains (Losses) on Sales of Other Real Estate</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_523DA0F778125F172D23984F6A0BFF24_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_523DA0F778125F172D23984F6A0BFF24" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Changes in assets and liabilities:</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_523DA0F778125F172D23984F6A0BFF24_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_523DA0F778125F172D23984F6A0BFF24" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating Capital [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_523DA0F778125F172D23984F6A0BFF24" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_5F1533BB42C495D59CFA984F6A0BCC22_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_5F1533BB42C495D59CFA984F6A0BCC22" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accrued expenses and other liabilities</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_5F1533BB42C495D59CFA984F6A0BCC22_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_5F1533BB42C495D59CFA984F6A0BCC22" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_5F1533BB42C495D59CFA984F6A0BCC22" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_5F1533BB42C495D59CFA984F6A0BCC22" xlink:to="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_5F1533BB42C495D59CFA984F6A0BCC22" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInLoansHeldForSale_14792738B65F5F9C3D86984F6A0B1905_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInLoansHeldForSale_14792738B65F5F9C3D86984F6A0B1905" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Loans held for sale</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInLoansHeldForSale_14792738B65F5F9C3D86984F6A0B1905_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInLoansHeldForSale_14792738B65F5F9C3D86984F6A0B1905" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Loans Held-for-sale</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInLoansHeldForSale" xlink:label="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_14792738B65F5F9C3D86984F6A0B1905" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_14792738B65F5F9C3D86984F6A0B1905" xlink:to="lab_us-gaap_IncreaseDecreaseInLoansHeldForSale_14792738B65F5F9C3D86984F6A0B1905" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F734A8FFA42D82F70722984F6A0BC6F2_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F734A8FFA42D82F70722984F6A0BC6F2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F734A8FFA42D82F70722984F6A0BC6F2_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F734A8FFA42D82F70722984F6A0BC6F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_F734A8FFA42D82F70722984F6A0BC6F2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_F734A8FFA42D82F70722984F6A0BC6F2" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F734A8FFA42D82F70722984F6A0BC6F2" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7C96C0EDC452DAB194BF984F6A0B9341_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7C96C0EDC452DAB194BF984F6A0B9341" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7C96C0EDC452DAB194BF984F6A0B9341_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7C96C0EDC452DAB194BF984F6A0B9341" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7C96C0EDC452DAB194BF984F6A0B9341" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7C96C0EDC452DAB194BF984F6A0B9341" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_7C96C0EDC452DAB194BF984F6A0B9341" xlink:type="arc" />
    <link:label id="lab_ucbi_InvestmentSecuritiesHeldToMaturityAbstract_8EDAED3ADF2C75D6A208984F6A0BE3E5_verboseLabel_en-US" xlink:label="lab_ucbi_InvestmentSecuritiesHeldToMaturityAbstract_8EDAED3ADF2C75D6A208984F6A0BE3E5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Debt securities held to maturity:</link:label>
    <link:label id="lab_ucbi_InvestmentSecuritiesHeldToMaturityAbstract_8EDAED3ADF2C75D6A208984F6A0BE3E5_label_en-US" xlink:label="lab_ucbi_InvestmentSecuritiesHeldToMaturityAbstract_8EDAED3ADF2C75D6A208984F6A0BE3E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Securities Held To Maturity [Abstract]</link:label>
    <link:label id="lab_ucbi_InvestmentSecuritiesHeldToMaturityAbstract_8EDAED3ADF2C75D6A208984F6A0BE3E5_documentation_en-US" xlink:label="lab_ucbi_InvestmentSecuritiesHeldToMaturityAbstract_8EDAED3ADF2C75D6A208984F6A0BE3E5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Investment securities held to maturity.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_InvestmentSecuritiesHeldToMaturityAbstract" xlink:label="loc_ucbi_InvestmentSecuritiesHeldToMaturityAbstract_8EDAED3ADF2C75D6A208984F6A0BE3E5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_InvestmentSecuritiesHeldToMaturityAbstract_8EDAED3ADF2C75D6A208984F6A0BE3E5" xlink:to="lab_ucbi_InvestmentSecuritiesHeldToMaturityAbstract_8EDAED3ADF2C75D6A208984F6A0BE3E5" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_60FD49101B8EB22737B2984F6A0B33F7_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_60FD49101B8EB22737B2984F6A0B33F7" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from maturities and calls of securities held to maturity</link:label>
    <link:label id="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_60FD49101B8EB22737B2984F6A0B33F7_label_en-US" xlink:label="lab_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_60FD49101B8EB22737B2984F6A0B33F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_60FD49101B8EB22737B2984F6A0B33F7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_8976E4796D22AB454F4D984F6A0B0257_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_8976E4796D22AB454F4D984F6A0B0257" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of securities held to maturity</link:label>
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    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesAbstract_8D4E85A847DE66571FBC984F6A0B8DB8_verboseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesAbstract_8D4E85A847DE66571FBC984F6A0B8DB8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Debt securities available for sale and equity securities:</link:label>
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesAbstract_8D4E85A847DE66571FBC984F6A0B8DB8_label_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesAbstract_8D4E85A847DE66571FBC984F6A0B8DB8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities [Abstract]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_CB16CE0E51DFEE839D67984F6A0B28FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_CB16CE0E51DFEE839D67984F6A0B28FE" xlink:to="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_CB16CE0E51DFEE839D67984F6A0B28FE" xlink:type="arc" />
    <link:label id="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_C6EFB78A4F28FF25CADC984F6A0B7531_verboseLabel_en-US" xlink:label="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_C6EFB78A4F28FF25CADC984F6A0B7531" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Unsettled securities purchases</link:label>
    <link:label id="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_C6EFB78A4F28FF25CADC984F6A0B7531_label_en-US" xlink:label="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_C6EFB78A4F28FF25CADC984F6A0B7531" 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_C6EFB78A4F28FF25CADC984F6A0B7531_documentation_en-US" xlink:label="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_C6EFB78A4F28FF25CADC984F6A0B7531" 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-20190331.xsd#ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale" xlink:label="loc_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_C6EFB78A4F28FF25CADC984F6A0B7531" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_C6EFB78A4F28FF25CADC984F6A0B7531" xlink:to="lab_ucbi_UnsettledPurchasesOfSecuritiesAvailableForSale_C6EFB78A4F28FF25CADC984F6A0B7531" xlink:type="arc" />
    <link:label id="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_BA9FEBBD8B2B09DF8794984F6A0B5A3C_verboseLabel_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_BA9FEBBD8B2B09DF8794984F6A0B5A3C" 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_BA9FEBBD8B2B09DF8794984F6A0B5A3C_label_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_BA9FEBBD8B2B09DF8794984F6A0B5A3C" 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_BA9FEBBD8B2B09DF8794984F6A0B5A3C_documentation_en-US" xlink:label="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_BA9FEBBD8B2B09DF8794984F6A0B5A3C" 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-20190331.xsd#ucbi_UnsettledGovernmentGuaranteedLoanSales" xlink:label="loc_ucbi_UnsettledGovernmentGuaranteedLoanSales_BA9FEBBD8B2B09DF8794984F6A0B5A3C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_UnsettledGovernmentGuaranteedLoanSales_BA9FEBBD8B2B09DF8794984F6A0B5A3C" xlink:to="lab_ucbi_UnsettledGovernmentGuaranteedLoanSales_BA9FEBBD8B2B09DF8794984F6A0B5A3C" xlink:type="arc" />
    <link:label id="lab_us-gaap_TransferToOtherRealEstate_B5ECBC491C8BDEA25F57984F6A0B8F43_verboseLabel_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_B5ECBC491C8BDEA25F57984F6A0B8F43" 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_B5ECBC491C8BDEA25F57984F6A0B8F43_label_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_B5ECBC491C8BDEA25F57984F6A0B8F43" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TransferToOtherRealEstate" xlink:label="loc_us-gaap_TransferToOtherRealEstate_B5ECBC491C8BDEA25F57984F6A0B8F43" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TransferToOtherRealEstate_B5ECBC491C8BDEA25F57984F6A0B8F43" xlink:to="lab_us-gaap_TransferToOtherRealEstate_B5ECBC491C8BDEA25F57984F6A0B8F43" xlink:type="arc" />
    <link:label id="lab_ucbi_ShareRepurchaseNotYetSettled_E76EDABA7683968E0538986E0F045F05_terseLabel_en-US" xlink:label="lab_ucbi_ShareRepurchaseNotYetSettled_E76EDABA7683968E0538986E0F045F05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsettled repurchases of common stock</link:label>
    <link:label id="lab_ucbi_ShareRepurchaseNotYetSettled_E76EDABA7683968E0538986E0F045F05_label_en-US" xlink:label="lab_ucbi_ShareRepurchaseNotYetSettled_E76EDABA7683968E0538986E0F045F05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Repurchase, Not Yet Settled</link:label>
    <link:label id="lab_ucbi_ShareRepurchaseNotYetSettled_E76EDABA7683968E0538986E0F045F05_documentation_en-US" xlink:label="lab_ucbi_ShareRepurchaseNotYetSettled_E76EDABA7683968E0538986E0F045F05" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share Repurchase, Not Yet Settled</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_ShareRepurchaseNotYetSettled" xlink:label="loc_ucbi_ShareRepurchaseNotYetSettled_E76EDABA7683968E0538986E0F045F05" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_ShareRepurchaseNotYetSettled_E76EDABA7683968E0538986E0F045F05" xlink:to="lab_ucbi_ShareRepurchaseNotYetSettled_E76EDABA7683968E0538986E0F045F05" xlink:type="arc" />
    <link:label id="lab_ucbi_AcquisitionsAbstract_31513AEBA3642B6CBC96984F6A0B07E2_terseLabel_en-US" xlink:label="lab_ucbi_AcquisitionsAbstract_31513AEBA3642B6CBC96984F6A0B07E2" 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_31513AEBA3642B6CBC96984F6A0B07E2_label_en-US" xlink:label="lab_ucbi_AcquisitionsAbstract_31513AEBA3642B6CBC96984F6A0B07E2" 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_31513AEBA3642B6CBC96984F6A0B07E2_documentation_en-US" xlink:label="lab_ucbi_AcquisitionsAbstract_31513AEBA3642B6CBC96984F6A0B07E2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_AcquisitionsAbstract" xlink:label="loc_ucbi_AcquisitionsAbstract_31513AEBA3642B6CBC96984F6A0B07E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_AcquisitionsAbstract_31513AEBA3642B6CBC96984F6A0B07E2" xlink:to="lab_ucbi_AcquisitionsAbstract_31513AEBA3642B6CBC96984F6A0B07E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueOfAssetsAcquired_F766ED84C0678A3E5F1A984F6A0B3FA9_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueOfAssetsAcquired_F766ED84C0678A3E5F1A984F6A0B3FA9" 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_F766ED84C0678A3E5F1A984F6A0B3FA9_label_en-US" xlink:label="lab_us-gaap_FairValueOfAssetsAcquired_F766ED84C0678A3E5F1A984F6A0B3FA9" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueOfAssetsAcquired" xlink:label="loc_us-gaap_FairValueOfAssetsAcquired_F766ED84C0678A3E5F1A984F6A0B3FA9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueOfAssetsAcquired_F766ED84C0678A3E5F1A984F6A0B3FA9" xlink:to="lab_us-gaap_FairValueOfAssetsAcquired_F766ED84C0678A3E5F1A984F6A0B3FA9" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesAssumed1_8F14B3F8651E99B688C1984F6A0B6710_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAssumed1_8F14B3F8651E99B688C1984F6A0B6710" 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_8F14B3F8651E99B688C1984F6A0B6710_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAssumed1_8F14B3F8651E99B688C1984F6A0B6710" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesAssumed1" xlink:label="loc_us-gaap_LiabilitiesAssumed1_8F14B3F8651E99B688C1984F6A0B6710" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAssumed1_8F14B3F8651E99B688C1984F6A0B6710" xlink:to="lab_us-gaap_LiabilitiesAssumed1_8F14B3F8651E99B688C1984F6A0B6710" xlink:type="arc" />
    <link:label id="lab_ucbi_NetAssetsAcquired_02B91222FE69B8CCE235984F6A0BA245_terseLabel_en-US" xlink:label="lab_ucbi_NetAssetsAcquired_02B91222FE69B8CCE235984F6A0BA245" 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_02B91222FE69B8CCE235984F6A0BA245_label_en-US" xlink:label="lab_ucbi_NetAssetsAcquired_02B91222FE69B8CCE235984F6A0BA245" 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_02B91222FE69B8CCE235984F6A0BA245_documentation_en-US" xlink:label="lab_ucbi_NetAssetsAcquired_02B91222FE69B8CCE235984F6A0BA245" 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-20190331.xsd#ucbi_NetAssetsAcquired" xlink:label="loc_ucbi_NetAssetsAcquired_02B91222FE69B8CCE235984F6A0BA245" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_NetAssetsAcquired_02B91222FE69B8CCE235984F6A0BA245" xlink:to="lab_ucbi_NetAssetsAcquired_02B91222FE69B8CCE235984F6A0BA245" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssued1_E1D50C227DF0789C2FFF984F6A0BA040_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssued1_E1D50C227DF0789C2FFF984F6A0BA040" 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_E1D50C227DF0789C2FFF984F6A0BA040_label_en-US" xlink:label="lab_us-gaap_StockIssued1_E1D50C227DF0789C2FFF984F6A0BA040" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssued1" xlink:label="loc_us-gaap_StockIssued1_E1D50C227DF0789C2FFF984F6A0BA040" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssued1_E1D50C227DF0789C2FFF984F6A0BA040" xlink:to="lab_us-gaap_StockIssued1_E1D50C227DF0789C2FFF984F6A0BA040" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_BB90E4A89401DBC10FDF860C275EA601_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_BB90E4A89401DBC10FDF860C275EA601" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Compensation Related Costs, Share-based Payments [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_BB90E4A89401DBC10FDF860C275EA601" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_BB90E4A89401DBC10FDF860C275EA601" xlink:to="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_BB90E4A89401DBC10FDF860C275EA601" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_15EC76A4AE1A249BF402860C276072E7_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_15EC76A4AE1A249BF402860C276072E7" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_15EC76A4AE1A249BF402860C276072E7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_15EC76A4AE1A249BF402860C276072E7" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_15EC76A4AE1A249BF402860C276072E7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_30EC07DAA1F27B6F8E23860C2760220A_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_30EC07DAA1F27B6F8E23860C2760220A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Shares</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_30EC07DAA1F27B6F8E23860C2760220A_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_30EC07DAA1F27B6F8E23860C2760220A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_30EC07DAA1F27B6F8E23860C2760220A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_30EC07DAA1F27B6F8E23860C2760220A" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_30EC07DAA1F27B6F8E23860C2760220A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_00A13D6821EB724C1494860C27606452_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_00A13D6821EB724C1494860C27606452" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Outstanding, beginning balance (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_00A13D6821EB724C1494860C27606452_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_00A13D6821EB724C1494860C27606452" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_00A13D6821EB724C1494860C27606452" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_00A13D6821EB724C1494860C27606452" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_00A13D6821EB724C1494860C27606452" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_BD1AAE3AF20EB233020E88DAFE96214D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_BD1AAE3AF20EB233020E88DAFE96214D" xlink:to="lab_us-gaap_FinancingReceivableAllowanceForCreditLosses_BD1AAE3AF20EB233020E88DAFE96214D" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_9789E5627897D0B2D57B88DAFE96F888_negatedLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_9789E5627897D0B2D57B88DAFE96F888" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Charge-Offs</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_9789E5627897D0B2D57B88DAFE96F888_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_9789E5627897D0B2D57B88DAFE96F888" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Losses, Write-downs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_9789E5627897D0B2D57B88DAFE96F888" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_9789E5627897D0B2D57B88DAFE96F888" xlink:to="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_9789E5627897D0B2D57B88DAFE96F888" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_899BD5FACC29AED7812D88DAFE964BC2_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_899BD5FACC29AED7812D88DAFE964BC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recoveries</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_899BD5FACC29AED7812D88DAFE964BC2_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_899BD5FACC29AED7812D88DAFE964BC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Losses, Recovery</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_899BD5FACC29AED7812D88DAFE964BC2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_899BD5FACC29AED7812D88DAFE964BC2" xlink:to="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_899BD5FACC29AED7812D88DAFE964BC2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProvisionForLoanAndLeaseLosses_24CC9D940ED13B6C338088DAFE96E358_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForLoanAndLeaseLosses_24CC9D940ED13B6C338088DAFE96E358" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">(Release)Provision</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProvisionForLoanAndLeaseLosses" xlink:label="loc_us-gaap_ProvisionForLoanAndLeaseLosses_24CC9D940ED13B6C338088DAFE96E358" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProvisionForLoanAndLeaseLosses_24CC9D940ED13B6C338088DAFE96E358" xlink:to="lab_us-gaap_ProvisionForLoanAndLeaseLosses_24CC9D940ED13B6C338088DAFE96E358" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLosses_86BF6EAD4238B236C11C88DAFE96EFCC_periodEndLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLosses_86BF6EAD4238B236C11C88DAFE96EFCC" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Ending Balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_86BF6EAD4238B236C11C88DAFE96EFCC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_86BF6EAD4238B236C11C88DAFE96EFCC" xlink:to="lab_us-gaap_FinancingReceivableAllowanceForCreditLosses_86BF6EAD4238B236C11C88DAFE96EFCC" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7C44D1035F20E63433C788DAFD220154_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7C44D1035F20E63433C788DAFD220154" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7C44D1035F20E63433C788DAFD220154_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7C44D1035F20E63433C788DAFD220154" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7C44D1035F20E63433C788DAFD220154" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7C44D1035F20E63433C788DAFD220154" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7C44D1035F20E63433C788DAFD220154" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByLiabilityClassAxis_1B4A44C2BE0F546B464088DAFD2399A1_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByLiabilityClassAxis_1B4A44C2BE0F546B464088DAFD2399A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liability Class [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByLiabilityClassAxis_1B4A44C2BE0F546B464088DAFD2399A1_label_en-US" xlink:label="lab_us-gaap_FairValueByLiabilityClassAxis_1B4A44C2BE0F546B464088DAFD2399A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liability Class [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_1B4A44C2BE0F546B464088DAFD2399A1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_1B4A44C2BE0F546B464088DAFD2399A1" xlink:to="lab_us-gaap_FairValueByLiabilityClassAxis_1B4A44C2BE0F546B464088DAFD2399A1" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_F9BB0F5EFF20E199AB9888DAFD2447EC_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_F9BB0F5EFF20E199AB9888DAFD2447EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value by Liability Class [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_F9BB0F5EFF20E199AB9888DAFD2447EC_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_F9BB0F5EFF20E199AB9888DAFD2447EC" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_F9BB0F5EFF20E199AB9888DAFD2447EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_F9BB0F5EFF20E199AB9888DAFD2447EC" xlink:to="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_F9BB0F5EFF20E199AB9888DAFD2447EC" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_ED6B7CEC814A2D5649C788DAFD2419EF_terseLabel_en-US" xlink:label="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_ED6B7CEC814A2D5649C788DAFD2419EF" 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_ED6B7CEC814A2D5649C788DAFD2419EF_label_en-US" xlink:label="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_ED6B7CEC814A2D5649C788DAFD2419EF" 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_ED6B7CEC814A2D5649C788DAFD2419EF_documentation_en-US" xlink:label="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_ED6B7CEC814A2D5649C788DAFD2419EF" 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-20190331.xsd#ucbi_DerivativeLiabilitiesRiskParticipationsMember" xlink:label="loc_ucbi_DerivativeLiabilitiesRiskParticipationsMember_ED6B7CEC814A2D5649C788DAFD2419EF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeLiabilitiesRiskParticipationsMember_ED6B7CEC814A2D5649C788DAFD2419EF" xlink:to="lab_ucbi_DerivativeLiabilitiesRiskParticipationsMember_ED6B7CEC814A2D5649C788DAFD2419EF" xlink:type="arc" />
    <link:label id="lab_ucbi_DerivativeLiabilityMember_1E2CCEDD20FD92AC9A5588DAFD24DAA3_terseLabel_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_1E2CCEDD20FD92AC9A5588DAFD24DAA3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative liabilities - other</link:label>
    <link:label id="lab_ucbi_DerivativeLiabilityMember_1E2CCEDD20FD92AC9A5588DAFD24DAA3_label_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_1E2CCEDD20FD92AC9A5588DAFD24DAA3" 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_1E2CCEDD20FD92AC9A5588DAFD24DAA3_documentation_en-US" xlink:label="lab_ucbi_DerivativeLiabilityMember_1E2CCEDD20FD92AC9A5588DAFD24DAA3" 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-20190331.xsd#ucbi_DerivativeLiabilityMember" xlink:label="loc_ucbi_DerivativeLiabilityMember_1E2CCEDD20FD92AC9A5588DAFD24DAA3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DerivativeLiabilityMember_1E2CCEDD20FD92AC9A5588DAFD24DAA3" xlink:to="lab_ucbi_DerivativeLiabilityMember_1E2CCEDD20FD92AC9A5588DAFD24DAA3" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByAssetClassAxis_D3F207C404CEB9EE028B88DAFD24C62E_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis_D3F207C404CEB9EE028B88DAFD24C62E" 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_D3F207C404CEB9EE028B88DAFD24C62E_label_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis_D3F207C404CEB9EE028B88DAFD24C62E" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_D3F207C404CEB9EE028B88DAFD24C62E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_D3F207C404CEB9EE028B88DAFD24C62E" xlink:to="lab_us-gaap_FairValueByAssetClassAxis_D3F207C404CEB9EE028B88DAFD24C62E" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_319C3D732DF97575AC8288DAFD24C018_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_319C3D732DF97575AC8288DAFD24C018" 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_319C3D732DF97575AC8288DAFD24C018_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_319C3D732DF97575AC8288DAFD24C018" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_319C3D732DF97575AC8288DAFD24C018" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_319C3D732DF97575AC8288DAFD24C018" xlink:to="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_319C3D732DF97575AC8288DAFD24C018" xlink:type="arc" />
    <link:label id="lab_ucbi_SBAServicingRightsMember_6C4EF24BD6C74BD0017B88DAFD252606_terseLabel_en-US" xlink:label="lab_ucbi_SBAServicingRightsMember_6C4EF24BD6C74BD0017B88DAFD252606" 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_6C4EF24BD6C74BD0017B88DAFD252606_label_en-US" xlink:label="lab_ucbi_SBAServicingRightsMember_6C4EF24BD6C74BD0017B88DAFD252606" 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_6C4EF24BD6C74BD0017B88DAFD252606_documentation_en-US" xlink:label="lab_ucbi_SBAServicingRightsMember_6C4EF24BD6C74BD0017B88DAFD252606" 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-20190331.xsd#ucbi_SBAServicingRightsMember" xlink:label="loc_ucbi_SBAServicingRightsMember_6C4EF24BD6C74BD0017B88DAFD252606" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_SBAServicingRightsMember_6C4EF24BD6C74BD0017B88DAFD252606" xlink:to="lab_ucbi_SBAServicingRightsMember_6C4EF24BD6C74BD0017B88DAFD252606" xlink:type="arc" />
    <link:label id="lab_ucbi_ResidentialMortgageServicingRightsMember_9AD7FC955E4BE992628E88DAFD259C38_verboseLabel_en-US" xlink:label="lab_ucbi_ResidentialMortgageServicingRightsMember_9AD7FC955E4BE992628E88DAFD259C38" 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_9AD7FC955E4BE992628E88DAFD259C38_label_en-US" xlink:label="lab_ucbi_ResidentialMortgageServicingRightsMember_9AD7FC955E4BE992628E88DAFD259C38" 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_9AD7FC955E4BE992628E88DAFD259C38_documentation_en-US" xlink:label="lab_ucbi_ResidentialMortgageServicingRightsMember_9AD7FC955E4BE992628E88DAFD259C38" 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-20190331.xsd#ucbi_ResidentialMortgageServicingRightsMember" xlink:label="loc_ucbi_ResidentialMortgageServicingRightsMember_9AD7FC955E4BE992628E88DAFD259C38" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_ResidentialMortgageServicingRightsMember_9AD7FC955E4BE992628E88DAFD259C38" xlink:to="lab_ucbi_ResidentialMortgageServicingRightsMember_9AD7FC955E4BE992628E88DAFD259C38" xlink:type="arc" />
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    <link:label id="lab_ucbi_DerivativeAssetMember_62E0DF26BDE44FD0DABE88DAFD25FD2B_label_en-US" xlink:label="lab_ucbi_DerivativeAssetMember_62E0DF26BDE44FD0DABE88DAFD25FD2B" 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_62E0DF26BDE44FD0DABE88DAFD25FD2B_documentation_en-US" xlink:label="lab_ucbi_DerivativeAssetMember_62E0DF26BDE44FD0DABE88DAFD25FD2B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents Derivative Asset.</link:label>
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    <link:label id="lab_ucbi_MeasurementInputPrepaymentRateMember_EFC356730C212732BECC88DAFD2618C0_label_en-US" xlink:label="lab_ucbi_MeasurementInputPrepaymentRateMember_EFC356730C212732BECC88DAFD2618C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Input, Prepayment Rate [Member]</link:label>
    <link:label id="lab_ucbi_MeasurementInputPrepaymentRateMember_EFC356730C212732BECC88DAFD2618C0_documentation_en-US" xlink:label="lab_ucbi_MeasurementInputPrepaymentRateMember_EFC356730C212732BECC88DAFD2618C0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Measurement Input, Prepayment Rate [Member]</link:label>
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    <link:label id="lab_ucbi_MeasurementInputPullThroughRateMember_7EF51D6AEF5600CB732788DAFD2611F8_documentation_en-US" xlink:label="lab_ucbi_MeasurementInputPullThroughRateMember_7EF51D6AEF5600CB732788DAFD2611F8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Measurement Input, Pull Through Rate [Member]</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_MeasurementInputPullThroughRateMember" xlink:label="loc_ucbi_MeasurementInputPullThroughRateMember_7EF51D6AEF5600CB732788DAFD2611F8" xlink:type="locator" />
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    <link:label id="lab_ucbi_MeasurementInputProbableExposureRateMember_AD1313DE4D67B272244E88DAFD2706A7_documentation_en-US" xlink:label="lab_ucbi_MeasurementInputProbableExposureRateMember_AD1313DE4D67B272244E88DAFD2706A7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Measurement Input, Probable Exposure Rate [Member]</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_MeasurementInputProbableExposureRateMember" xlink:label="loc_ucbi_MeasurementInputProbableExposureRateMember_AD1313DE4D67B272244E88DAFD2706A7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InterestExpenseDeposits_45ED02F4A77C911EBE82860C2BAE4BF6_totalLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseDeposits_45ED02F4A77C911EBE82860C2BAE4BF6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total deposit interest expense</link:label>
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    <link:label id="lab_us-gaap_InterestExpenseShortTermBorrowings_C8CA7A81FF65C1E73D9F860C2BAE3322_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseShortTermBorrowings_C8CA7A81FF65C1E73D9F860C2BAE3322" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Short-term borrowings</link:label>
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    <link:label id="lab_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_39EB2777135DA83D1CBF860C2BAE7C33_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_39EB2777135DA83D1CBF860C2BAE7C33" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Federal Home Loan Bank advances</link:label>
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    <link:label id="lab_us-gaap_InterestExpense_4846A24903E6EE949054860C2BAE85B8_label_en-US" xlink:label="lab_us-gaap_InterestExpense_4846A24903E6EE949054860C2BAE85B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense</link:label>
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    <link:label id="lab_us-gaap_NoninterestIncomeOther_21D388A76A399E3580A8860C2BB0EB0F_label_en-US" xlink:label="lab_us-gaap_NoninterestIncomeOther_21D388A76A399E3580A8860C2BB0EB0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noninterest Income, Other</link:label>
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    <link:label id="lab_us-gaap_Revenues_85B05B48326A17232FC9860C2BB1EA48_label_en-US" xlink:label="lab_us-gaap_Revenues_85B05B48326A17232FC9860C2BB1EA48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
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    <link:label id="lab_us-gaap_OperatingExpensesAbstract_4D2542A5DC0127D4056F860C2BB17D09_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_4D2542A5DC0127D4056F860C2BB17D09" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Noninterest expenses:</link:label>
    <link:label id="lab_us-gaap_OperatingExpensesAbstract_4D2542A5DC0127D4056F860C2BB17D09_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_4D2542A5DC0127D4056F860C2BB17D09" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Expenses [Abstract]</link:label>
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    <link:label id="lab_us-gaap_LaborAndRelatedExpense_293A732BCFF8B58B0054860C2BB1750E_verboseLabel_en-US" xlink:label="lab_us-gaap_LaborAndRelatedExpense_293A732BCFF8B58B0054860C2BB1750E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Salaries and employee benefits</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_293A732BCFF8B58B0054860C2BB1750E" xlink:type="locator" />
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    <link:label id="lab_ucbi_CommunicationsAndEquipment_CA20A3E04C76133F0DB7860C2BB1AFC1_verboseLabel_en-US" xlink:label="lab_ucbi_CommunicationsAndEquipment_CA20A3E04C76133F0DB7860C2BB1AFC1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Communications and equipment</link:label>
    <link:label id="lab_ucbi_CommunicationsAndEquipment_CA20A3E04C76133F0DB7860C2BB1AFC1_label_en-US" xlink:label="lab_ucbi_CommunicationsAndEquipment_CA20A3E04C76133F0DB7860C2BB1AFC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Communications and Equipment</link:label>
    <link:label id="lab_ucbi_CommunicationsAndEquipment_CA20A3E04C76133F0DB7860C2BB1AFC1_documentation_en-US" xlink:label="lab_ucbi_CommunicationsAndEquipment_CA20A3E04C76133F0DB7860C2BB1AFC1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of communications and equipment expenses.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_CommunicationsAndEquipment" xlink:label="loc_ucbi_CommunicationsAndEquipment_CA20A3E04C76133F0DB7860C2BB1AFC1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OccupancyNet_048FBA2F03A62B84E85E860C2BB17E3E_verboseLabel_en-US" xlink:label="lab_us-gaap_OccupancyNet_048FBA2F03A62B84E85E860C2BB17E3E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Occupancy</link:label>
    <link:label id="lab_us-gaap_OccupancyNet_048FBA2F03A62B84E85E860C2BB17E3E_label_en-US" xlink:label="lab_us-gaap_OccupancyNet_048FBA2F03A62B84E85E860C2BB17E3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Occupancy, Net</link:label>
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    <link:label id="lab_us-gaap_MarketingAndAdvertisingExpense_339F78CAD3E951D9D24A860C2BB1C5DC_verboseLabel_en-US" xlink:label="lab_us-gaap_MarketingAndAdvertisingExpense_339F78CAD3E951D9D24A860C2BB1C5DC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Advertising and public relations</link:label>
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    <link:label id="lab_us-gaap_SuppliesAndPostageExpense_C302DAC39E0E04B5C6BB860C2BB2D1D3_verboseLabel_en-US" xlink:label="lab_us-gaap_SuppliesAndPostageExpense_C302DAC39E0E04B5C6BB860C2BB2D1D3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Postage, printing and supplies</link:label>
    <link:label id="lab_us-gaap_SuppliesAndPostageExpense_C302DAC39E0E04B5C6BB860C2BB2D1D3_label_en-US" xlink:label="lab_us-gaap_SuppliesAndPostageExpense_C302DAC39E0E04B5C6BB860C2BB2D1D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplies and Postage Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SuppliesAndPostageExpense" xlink:label="loc_us-gaap_SuppliesAndPostageExpense_C302DAC39E0E04B5C6BB860C2BB2D1D3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProfessionalFees_3FCB4CBD7F1C9ED3A465860C2BB24748_verboseLabel_en-US" xlink:label="lab_us-gaap_ProfessionalFees_3FCB4CBD7F1C9ED3A465860C2BB24748" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Professional fees</link:label>
    <link:label id="lab_us-gaap_ProfessionalFees_3FCB4CBD7F1C9ED3A465860C2BB24748_label_en-US" xlink:label="lab_us-gaap_ProfessionalFees_3FCB4CBD7F1C9ED3A465860C2BB24748" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Professional Fees</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_ProfessionalFees_3FCB4CBD7F1C9ED3A465860C2BB24748" xlink:to="lab_us-gaap_ProfessionalFees_3FCB4CBD7F1C9ED3A465860C2BB24748" xlink:type="arc" />
    <link:label id="lab_ucbi_FdicAssessmentsAndOtherRegulatoryCharges_F197504FEF9DF07A0DC4860C2BB2A36B_verboseLabel_en-US" xlink:label="lab_ucbi_FdicAssessmentsAndOtherRegulatoryCharges_F197504FEF9DF07A0DC4860C2BB2A36B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">FDIC assessments and other regulatory charges</link:label>
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    <link:label id="lab_ucbi_FdicAssessmentsAndOtherRegulatoryCharges_F197504FEF9DF07A0DC4860C2BB2A36B_documentation_en-US" xlink:label="lab_ucbi_FdicAssessmentsAndOtherRegulatoryCharges_F197504FEF9DF07A0DC4860C2BB2A36B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of FDIC assessments and other regulatory expenses.</link:label>
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    <link:label id="lab_us-gaap_BusinessCombinationAcquisitionRelatedCosts_455AE9275D1D431D7182860C2BB2ADB6_verboseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationAcquisitionRelatedCosts_455AE9275D1D431D7182860C2BB2ADB6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Merger-related and other charges</link:label>
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    <link:label id="lab_ucbi_WatchMember_449E4C9052D265797A5F88DAFDFF0096_verboseLabel_en-US" xlink:label="lab_ucbi_WatchMember_449E4C9052D265797A5F88DAFDFF0096" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Watch</link:label>
    <link:label id="lab_ucbi_WatchMember_449E4C9052D265797A5F88DAFDFF0096_label_en-US" xlink:label="lab_ucbi_WatchMember_449E4C9052D265797A5F88DAFDFF0096" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Watch [Member]</link:label>
    <link:label id="lab_ucbi_WatchMember_449E4C9052D265797A5F88DAFDFF0096_documentation_en-US" xlink:label="lab_ucbi_WatchMember_449E4C9052D265797A5F88DAFDFF0096" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents watch.</link:label>
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    <link:label id="lab_us-gaap_DoubtfulMember_2644DC509546D5FA6D3E88DAFDFF2076_verboseLabel_en-US" xlink:label="lab_us-gaap_DoubtfulMember_2644DC509546D5FA6D3E88DAFDFF2076" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Doubtful / Loss</link:label>
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    <link:label id="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_C3A99EAC8A2F6E6B151288DAFE5E8CC6_verboseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_C3A99EAC8A2F6E6B151288DAFE5E8CC6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Average Balance</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_C3A99EAC8A2F6E6B151288DAFE5E8CC6_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment_C3A99EAC8A2F6E6B151288DAFE5E8CC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impaired Financing Receivable, Average Recorded Investment</link:label>
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    <link:label id="lab_us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod_B509847B4D19AC05C51D88DAFE5F1135_verboseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod_B509847B4D19AC05C51D88DAFE5F1135" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Interest Revenue Recognized During Impairment</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_B9507ADE6BA00CA5A5DE984F6A1A8218" xlink:type="locator" />
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    <link:label id="lab_dei_EntityDomain_7E78255DFD6A1AAAEF4B984F6711A394_label_en-US" xlink:label="lab_dei_EntityDomain_7E78255DFD6A1AAAEF4B984F6711A394" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_7E78255DFD6A1AAAEF4B984F6711A394" xlink:type="locator" />
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    <link:label id="lab_ucbi_FirstMadisonBankAndTrustMember_578B4DA0724EE2F9C259984F67116E34_terseLabel_en-US" xlink:label="lab_ucbi_FirstMadisonBankAndTrustMember_578B4DA0724EE2F9C259984F67116E34" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">First Madison Bank and Trust</link:label>
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    <link:label id="lab_us-gaap_NetInvestmentInLeasesAbstract_033956B5347DB7553FEC98852B2AA199_terseLabel_en-US" xlink:label="lab_us-gaap_NetInvestmentInLeasesAbstract_033956B5347DB7553FEC98852B2AA199" 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_us-gaap_DirectFinancingLeaseLeaseReceivable_C0F5871F7500E3DE0D179884D8998453_terseLabel_en-US" xlink:label="lab_us-gaap_DirectFinancingLeaseLeaseReceivable_C0F5871F7500E3DE0D179884D8998453" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum future lease payments receivable</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DirectFinancingLeaseNetInvestmentInLease" xlink:label="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLease_38F66A49443001EACBB498BDE3E3E26E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLease_38F66A49443001EACBB498BDE3E3E26E" xlink:to="lab_us-gaap_DirectFinancingLeaseNetInvestmentInLease_38F66A49443001EACBB498BDE3E3E26E" xlink:type="arc" />
    <link:label id="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_2DC8C7E7B6A1F1A12A71984F697EB35C_verboseLabel_en-US" xlink:label="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_2DC8C7E7B6A1F1A12A71984F697EB35C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Criteria amount for evaluation of impairment</link:label>
    <link:label id="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_2DC8C7E7B6A1F1A12A71984F697EB35C_label_en-US" xlink:label="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_2DC8C7E7B6A1F1A12A71984F697EB35C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Amount Of Loan Evaluated For Impairment</link:label>
    <link:label id="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_2DC8C7E7B6A1F1A12A71984F697EB35C_documentation_en-US" xlink:label="lab_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_2DC8C7E7B6A1F1A12A71984F697EB35C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents minimum amount of loan evaluated for impairment.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_MinimumAmountOfLoanEvaluatedForImpairment" xlink:label="loc_ucbi_MinimumAmountOfLoanEvaluatedForImpairment_2DC8C7E7B6A1F1A12A71984F697EB35C" xlink:type="locator" />
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    <link:label id="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_92EC9EB8620D44CE8F0D984F697E62E0_verboseLabel_en-US" xlink:label="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_92EC9EB8620D44CE8F0D984F697E62E0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Specific reserves</link:label>
    <link:label id="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_92EC9EB8620D44CE8F0D984F697E62E0_label_en-US" xlink:label="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_92EC9EB8620D44CE8F0D984F697E62E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Specific Reserves Allocated To Customers Whose Loan Terms Modified In Troubled Debt Restructurings</link:label>
    <link:label id="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_92EC9EB8620D44CE8F0D984F697E62E0_documentation_en-US" xlink:label="lab_ucbi_SpecificReservesAllocatedToCustomersWhoseLoanTermsModifiedInTroubledDebtRestructurings_92EC9EB8620D44CE8F0D984F697E62E0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents specific reserves allocated to customers whose loan terms modified in troubled debt restructurings.</link:label>
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    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_E8347C5512BD9975D539984F697E47C0_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_E8347C5512BD9975D539984F697E47C0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Additional availability on loans classified as troubled debt restructurings</link:label>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_E8347C5512BD9975D539984F697E47C0_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_E8347C5512BD9975D539984F697E47C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans and Leases Receivable, Impaired, Commitment to Lend</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend" xlink:label="loc_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_E8347C5512BD9975D539984F697E47C0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_E8347C5512BD9975D539984F697E47C0" xlink:to="lab_us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend_E8347C5512BD9975D539984F697E47C0" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_59B90016AA9E4803F545984F697EEFCB_verboseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_59B90016AA9E4803F545984F697EEFCB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gross additional interest income that would have been earned if the nonaccrual loans had performed as per original terms</link:label>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_59B90016AA9E4803F545984F697EEFCB_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_59B90016AA9E4803F545984F697EEFCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans" xlink:label="loc_us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_59B90016AA9E4803F545984F697EEFCB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_59B90016AA9E4803F545984F697EEFCB" xlink:to="lab_us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans_59B90016AA9E4803F545984F697EEFCB" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_B96B857856BD75FF4622CDD76415BD96_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_E92D76EA8793527681361420C6A5602D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of stock option activity</link:label>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_B96B857856BD75FF4622CDD76415BD96_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_E92D76EA8793527681361420C6A5602D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation, Stock Options, Activity [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_E92D76EA8793527681361420C6A5602D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_E92D76EA8793527681361420C6A5602D" xlink:to="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_E92D76EA8793527681361420C6A5602D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_80771ACBCF27803BBFB3CDD7641579EE_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_3790CB2D47955D858A805A0A46064545" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of restricted stock units activity</link:label>
    <link:label id="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_80771ACBCF27803BBFB3CDD7641579EE_label_en-US" xlink:label="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_3790CB2D47955D858A805A0A46064545" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_3790CB2D47955D858A805A0A46064545" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_3790CB2D47955D858A805A0A46064545" xlink:to="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_3790CB2D47955D858A805A0A46064545" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseCostTableTextBlock_C8D840388672D49C09C68A3213A9C788_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_C8D840388672D49C09C68A3213A9C788" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of operating lease income and expense and other supplemental information</link:label>
    <link:label id="lab_us-gaap_LeaseCostTableTextBlock_C8D840388672D49C09C68A3213A9C788_label_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_C8D840388672D49C09C68A3213A9C788" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeaseCostTableTextBlock" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_C8D840388672D49C09C68A3213A9C788" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCostTableTextBlock_C8D840388672D49C09C68A3213A9C788" xlink:to="lab_us-gaap_LeaseCostTableTextBlock_C8D840388672D49C09C68A3213A9C788" xlink:type="arc" />
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E1A9BA8BDA8A90C18A8E8A3EB9BC7BE2_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E1A9BA8BDA8A90C18A8E8A3EB9BC7BE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of future minimum lease payments under operating leases</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E1A9BA8BDA8A90C18A8E8A3EB9BC7BE2_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E1A9BA8BDA8A90C18A8E8A3EB9BC7BE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Maturity [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E1A9BA8BDA8A90C18A8E8A3EB9BC7BE2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E1A9BA8BDA8A90C18A8E8A3EB9BC7BE2" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E1A9BA8BDA8A90C18A8E8A3EB9BC7BE2" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_654AD31A5195CFA5186388DAFED93406_verboseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_654AD31A5195CFA5186388DAFED93406" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Summary of available for sale securities in an unrealized loss position</link:label>
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_654AD31A5195CFA5186388DAFED93406_label_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_654AD31A5195CFA5186388DAFED93406" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_654AD31A5195CFA5186388DAFED93406" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_654AD31A5195CFA5186388DAFED93406" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract_654AD31A5195CFA5186388DAFED93406" xlink:type="arc" />
    <link:label id="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_14A222F7388567E57B3388DAFED9B00D_verboseLabel_en-US" xlink:label="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_14A222F7388567E57B3388DAFED9B00D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Less than 12 Months</link:label>
    <link:label id="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_14A222F7388567E57B3388DAFED9B00D_label_en-US" xlink:label="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_14A222F7388567E57B3388DAFED9B00D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than 12 Months</link:label>
    <link:label id="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_14A222F7388567E57B3388DAFED9B00D_documentation_en-US" xlink:label="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_14A222F7388567E57B3388DAFED9B00D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_14A222F7388567E57B3388DAFED9B00D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_14A222F7388567E57B3388DAFED9B00D" xlink:to="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_14A222F7388567E57B3388DAFED9B00D" xlink:type="arc" />
    <link:label id="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_056A628AAE313E1B990E88DAFED922EC_verboseLabel_en-US" xlink:label="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_056A628AAE313E1B990E88DAFED922EC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Unrealized Loss, Less than 12 Months</link:label>
    <link:label id="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_056A628AAE313E1B990E88DAFED922EC_label_en-US" xlink:label="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_056A628AAE313E1B990E88DAFED922EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss</link:label>
    <link:label id="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_056A628AAE313E1B990E88DAFED922EC_documentation_en-US" xlink:label="lab_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_056A628AAE313E1B990E88DAFED922EC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss" xlink:label="loc_ucbi_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_056A628AAE313E1B990E88DAFED922EC" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_61F9A30079256D20CFEC860C2B631829" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesOutstanding_61F9A30079256D20CFEC860C2B631829" xlink:to="lab_us-gaap_CommonStockSharesOutstanding_61F9A30079256D20CFEC860C2B631829" xlink:type="arc" />
    <link:label id="lab_ucbi_CommonStockIssuableShares_560BFF7475199065A08E860C2B6395E6_verboseLabel_en-US" xlink:label="lab_ucbi_CommonStockIssuableShares_560BFF7475199065A08E860C2B6395E6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock issuable (in shares)</link:label>
    <link:label id="lab_ucbi_CommonStockIssuableShares_560BFF7475199065A08E860C2B6395E6_label_en-US" xlink:label="lab_ucbi_CommonStockIssuableShares_560BFF7475199065A08E860C2B6395E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock Issuable, Shares</link:label>
    <link:label id="lab_ucbi_CommonStockIssuableShares_560BFF7475199065A08E860C2B6395E6_documentation_en-US" xlink:label="lab_ucbi_CommonStockIssuableShares_560BFF7475199065A08E860C2B6395E6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents number of shares of common stock issuable.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_CommonStockIssuableShares" xlink:label="loc_ucbi_CommonStockIssuableShares_560BFF7475199065A08E860C2B6395E6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_CommonStockIssuableShares_560BFF7475199065A08E860C2B6395E6" xlink:to="lab_ucbi_CommonStockIssuableShares_560BFF7475199065A08E860C2B6395E6" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseCostAbstract_E9444F35C0A918F0C9D38A37E9C64081_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostAbstract_E9444F35C0A918F0C9D38A37E9C64081" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Lease Income and Expense</link:label>
    <link:label id="lab_us-gaap_LeaseCostAbstract_E9444F35C0A918F0C9D38A37E9C64081_label_en-US" xlink:label="lab_us-gaap_LeaseCostAbstract_E9444F35C0A918F0C9D38A37E9C64081" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeaseCostAbstract" xlink:label="loc_us-gaap_LeaseCostAbstract_E9444F35C0A918F0C9D38A37E9C64081" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCostAbstract_E9444F35C0A918F0C9D38A37E9C64081" xlink:to="lab_us-gaap_LeaseCostAbstract_E9444F35C0A918F0C9D38A37E9C64081" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseCost_9604C943694C4A9548F08A35836FEA8C_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_9604C943694C4A9548F08A35836FEA8C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease cost</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseCost_9604C943694C4A9548F08A35836FEA8C_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_9604C943694C4A9548F08A35836FEA8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_9604C943694C4A9548F08A35836FEA8C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseCost_9604C943694C4A9548F08A35836FEA8C" xlink:to="lab_us-gaap_OperatingLeaseCost_9604C943694C4A9548F08A35836FEA8C" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableLeaseCost_D4B13E160430080D670A8A35E00A2847_terseLabel_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_D4B13E160430080D670A8A35E00A2847" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable lease cost</link:label>
    <link:label id="lab_us-gaap_VariableLeaseCost_D4B13E160430080D670A8A35E00A2847_label_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_D4B13E160430080D670A8A35E00A2847" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableLeaseCost" xlink:label="loc_us-gaap_VariableLeaseCost_D4B13E160430080D670A8A35E00A2847" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableLeaseCost_D4B13E160430080D670A8A35E00A2847" xlink:to="lab_us-gaap_VariableLeaseCost_D4B13E160430080D670A8A35E00A2847" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShortTermLeaseCost_8AF75D48EE1A770248178A35F5339538_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_8AF75D48EE1A770248178A35F5339538" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Short-term lease cost</link:label>
    <link:label id="lab_us-gaap_ShortTermLeaseCost_8AF75D48EE1A770248178A35F5339538_label_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_8AF75D48EE1A770248178A35F5339538" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Short-term Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="loc_us-gaap_ShortTermLeaseCost_8AF75D48EE1A770248178A35F5339538" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShortTermLeaseCost_8AF75D48EE1A770248178A35F5339538" xlink:to="lab_us-gaap_ShortTermLeaseCost_8AF75D48EE1A770248178A35F5339538" xlink:type="arc" />
    <link:label id="lab_us-gaap_SubleaseIncome_664F2814B78F2B09210F8A36F52F05C1_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SubleaseIncome_664F2814B78F2B09210F8A36F52F05C1" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Sublease income</link:label>
    <link:label id="lab_us-gaap_SubleaseIncome_664F2814B78F2B09210F8A36F52F05C1_label_en-US" xlink:label="lab_us-gaap_SubleaseIncome_664F2814B78F2B09210F8A36F52F05C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sublease Income</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaap_SubleaseIncome_664F2814B78F2B09210F8A36F52F05C1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubleaseIncome_664F2814B78F2B09210F8A36F52F05C1" xlink:to="lab_us-gaap_SubleaseIncome_664F2814B78F2B09210F8A36F52F05C1" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseCost_0339053EED75C49207028A37093D136E_totalLabel_en-US" xlink:label="lab_us-gaap_LeaseCost_0339053EED75C49207028A37093D136E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net lease cost</link:label>
    <link:label id="lab_us-gaap_LeaseCost_0339053EED75C49207028A37093D136E_label_en-US" xlink:label="lab_us-gaap_LeaseCost_0339053EED75C49207028A37093D136E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease, Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_0339053EED75C49207028A37093D136E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCost_0339053EED75C49207028A37093D136E" xlink:to="lab_us-gaap_LeaseCost_0339053EED75C49207028A37093D136E" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLeaseIncome_728ED66B216BD1F21DD88A3AAE6096D0_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLeaseIncome_728ED66B216BD1F21DD88A3AAE6096D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rental income from owned properties under operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLeaseIncome_728ED66B216BD1F21DD88A3AAE6096D0_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLeaseIncome_728ED66B216BD1F21DD88A3AAE6096D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Lease Income</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeaseLeaseIncome" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_728ED66B216BD1F21DD88A3AAE6096D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLeaseIncome_728ED66B216BD1F21DD88A3AAE6096D0" xlink:to="lab_us-gaap_OperatingLeaseLeaseIncome_728ED66B216BD1F21DD88A3AAE6096D0" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasePayments_F4E26C760AE4300548AC8A379FFE3085_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_F4E26C760AE4300548AC8A379FFE3085" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating cash flows from operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeasePayments_F4E26C760AE4300548AC8A379FFE3085_label_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_F4E26C760AE4300548AC8A379FFE3085" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Payments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="loc_us-gaap_OperatingLeasePayments_F4E26C760AE4300548AC8A379FFE3085" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasePayments_F4E26C760AE4300548AC8A379FFE3085" xlink:to="lab_us-gaap_OperatingLeasePayments_F4E26C760AE4300548AC8A379FFE3085" xlink:type="arc" />
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_16C0143B0F54C0B6DEF0987A14C2A271_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_16C0143B0F54C0B6DEF0987A14C2A271" 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>
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_16C0143B0F54C0B6DEF0987A14C2A271_label_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_16C0143B0F54C0B6DEF0987A14C2A271" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_16C0143B0F54C0B6DEF0987A14C2A271" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_16C0143B0F54C0B6DEF0987A14C2A271" xlink:to="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivableFiscalYearMaturityAbstract_16C0143B0F54C0B6DEF0987A14C2A271" xlink:type="arc" />
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_E3A66DC48D69246FC1A2987A4B02CB07_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_E3A66DC48D69246FC1A2987A4B02CB07" 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_E3A66DC48D69246FC1A2987A4B02CB07_label_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_E3A66DC48D69246FC1A2987A4B02CB07" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_E3A66DC48D69246FC1A2987A4B02CB07" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_E3A66DC48D69246FC1A2987A4B02CB07" xlink:to="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedRemainderOfFiscalYear_E3A66DC48D69246FC1A2987A4B02CB07" xlink:type="arc" />
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_1E60B93288BB25AE7E50987A6E0BA10B_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_1E60B93288BB25AE7E50987A6E0BA10B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_1E60B93288BB25AE7E50987A6E0BA10B_label_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_1E60B93288BB25AE7E50987A6E0BA10B" 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, Two Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_1E60B93288BB25AE7E50987A6E0BA10B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_1E60B93288BB25AE7E50987A6E0BA10B" xlink:to="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_1E60B93288BB25AE7E50987A6E0BA10B" xlink:type="arc" />
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_C765E548450F2113FE7A987A961E4B7E_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_C765E548450F2113FE7A987A961E4B7E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_C765E548450F2113FE7A987A961E4B7E_label_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_C765E548450F2113FE7A987A961E4B7E" 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, Three Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_C765E548450F2113FE7A987A961E4B7E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_C765E548450F2113FE7A987A961E4B7E" xlink:to="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_C765E548450F2113FE7A987A961E4B7E" xlink:type="arc" />
    <link:label id="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_21720E56448DB4F14C83987AAEA8B367_terseLabel_en-US" xlink:label="lab_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_21720E56448DB4F14C83987AAEA8B367" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
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    <link:label id="lab_ucbi_MortgageLoanRevenueMember_97A462869062E504A34788DAFD96D8A3_verboseLabel_en-US" xlink:label="lab_ucbi_MortgageLoanRevenueMember_97A462869062E504A34788DAFD96D8A3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Mortgage loan revenue</link:label>
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    <link:label id="lab_us-gaap_StatementTable_5A23112CF6C776100663984F6A1A1EBA_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable_5A23112CF6C776100663984F6A1A1EBA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement [Table]</link:label>
    <link:label id="lab_us-gaap_StatementTable_5A23112CF6C776100663984F6A1A1EBA_label_en-US" xlink:label="lab_us-gaap_StatementTable_5A23112CF6C776100663984F6A1A1EBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_5A23112CF6C776100663984F6A1A1EBA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CommonStockMember_682D88917D2DCE02C0FD984F6A1AA28F_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockMember_682D88917D2DCE02C0FD984F6A1AA28F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common Stock</link:label>
    <link:label id="lab_us-gaap_CommonStockMember_682D88917D2DCE02C0FD984F6A1AA28F_label_en-US" xlink:label="lab_us-gaap_CommonStockMember_682D88917D2DCE02C0FD984F6A1AA28F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_682D88917D2DCE02C0FD984F6A1AA28F" xlink:type="locator" />
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    <link:label id="lab_ucbi_CommonStockIssuableMember_72B5B7DF3894DBDDCEB2984F6A1A70F4_verboseLabel_en-US" xlink:label="lab_ucbi_CommonStockIssuableMember_72B5B7DF3894DBDDCEB2984F6A1A70F4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common Stock Issuable</link:label>
    <link:label id="lab_ucbi_CommonStockIssuableMember_72B5B7DF3894DBDDCEB2984F6A1A70F4_label_en-US" xlink:label="lab_ucbi_CommonStockIssuableMember_72B5B7DF3894DBDDCEB2984F6A1A70F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock Issuable [Member]</link:label>
    <link:label id="lab_ucbi_CommonStockIssuableMember_72B5B7DF3894DBDDCEB2984F6A1A70F4_documentation_en-US" xlink:label="lab_ucbi_CommonStockIssuableMember_72B5B7DF3894DBDDCEB2984F6A1A70F4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Common stock issuable.</link:label>
    <link:loc xlink:href="ucbi-20190331.xsd#ucbi_CommonStockIssuableMember" xlink:label="loc_ucbi_CommonStockIssuableMember_72B5B7DF3894DBDDCEB2984F6A1A70F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_CommonStockIssuableMember_72B5B7DF3894DBDDCEB2984F6A1A70F4" xlink:to="lab_ucbi_CommonStockIssuableMember_72B5B7DF3894DBDDCEB2984F6A1A70F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_89D2745CBBCE2FB2D75E984F6A1A6AB1_verboseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_89D2745CBBCE2FB2D75E984F6A1A6AB1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Capital Surplus</link:label>
    <link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_89D2745CBBCE2FB2D75E984F6A1A6AB1_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_89D2745CBBCE2FB2D75E984F6A1A6AB1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional Paid-in Capital [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_89D2745CBBCE2FB2D75E984F6A1A6AB1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RetainedEarningsMember_E985C68D88E569F1F564984F6A1A0126_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_E985C68D88E569F1F564984F6A1A0126" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained Earnings [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_E985C68D88E569F1F564984F6A1A0126" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8CC0BAC9A023E97DC2D5984F6A1A2037_verboseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8CC0BAC9A023E97DC2D5984F6A1A2037" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss)</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8CC0BAC9A023E97DC2D5984F6A1A2037_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8CC0BAC9A023E97DC2D5984F6A1A2037" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AOCI Attributable to Parent [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_8CC0BAC9A023E97DC2D5984F6A1A2037" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StatementLineItems_23D4669909F087A78C7D984F6A1A7E27_terseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_23D4669909F087A78C7D984F6A1A7E27" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:label id="lab_us-gaap_StatementLineItems_23D4669909F087A78C7D984F6A1A7E27_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_23D4669909F087A78C7D984F6A1A7E27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_23D4669909F087A78C7D984F6A1A7E27" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B2C2A96A150BC806DD3C984F6A1A740C_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B2C2A96A150BC806DD3C984F6A1A740C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Stockholders' Equity [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B2C2A96A150BC806DD3C984F6A1A740C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B2C2A96A150BC806DD3C984F6A1A740C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Stockholders' Equity [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_B2C2A96A150BC806DD3C984F6A1A740C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockholdersEquity_F18D2A6F4B01212E3676984F6A1A4AF8_periodStartLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_F18D2A6F4B01212E3676984F6A1A4AF8" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Beginning balance</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_8BE39BAF0343917EFFA0984F6A1A15A9_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_8BE39BAF0343917EFFA0984F6A1A15A9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive income (loss)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_8BE39BAF0343917EFFA0984F6A1A15A9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_93F8CA31C1760F9371E1984F6A1AE23D_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_93F8CA31C1760F9371E1984F6A1AE23D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Exercise of stock options (12,000 shares)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_93F8CA31C1760F9371E1984F6A1AE23D" xlink:type="locator" />
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    <link:label id="lab_ucbi_CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansValue_63147679ADA05095F893984F6A1A4C45_verboseLabel_en-US" xlink:label="lab_ucbi_CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansValue_63147679ADA05095F893984F6A1A4C45" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock issued to dividend reinvestment plan and employee benefit plans (8,445 shares and 5,204 shares for the periods ended March 31, 2019 and 2018, respectively)</link:label>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueAcquisitions_61F509485DADA9063093984F6A2A7B6F_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueAcquisitions_61F509485DADA9063093984F6A2A7B6F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock issued for acquisition (1,443,987 shares)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_61F509485DADA9063093984F6A2A7B6F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6DDB39CD1421D1AD7E9F984F6A2A4A97_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6DDB39CD1421D1AD7E9F984F6A2A4A97" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Amortization of stock options and or restricted stock awards</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6DDB39CD1421D1AD7E9F984F6A2A4A97_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6DDB39CD1421D1AD7E9F984F6A2A4A97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6DDB39CD1421D1AD7E9F984F6A2A4A97" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6DDB39CD1421D1AD7E9F984F6A2A4A97" xlink:to="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_6DDB39CD1421D1AD7E9F984F6A2A4A97" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_1B678C813D466695637E984F6A2AA8C4_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_1B678C813D466695637E984F6A2AA8C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vesting of restricted stock, net of shares surrendered to cover payroll taxes (15,945 shares issued, 19,450 shares deferred and 48,310 shares issued, 46,074 shares deferred for the periods ended March 31, 2019 and 2018, respectively)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_1B678C813D466695637E984F6A2AA8C4_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_1B678C813D466695637E984F6A2AA8C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_1B678C813D466695637E984F6A2AA8C4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_1B678C813D466695637E984F6A2AA8C4" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_1B678C813D466695637E984F6A2AA8C4" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_C0C71322A5BF277796CC985E655F1CDE_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_C0C71322A5BF277796CC985E655F1CDE" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Purchases of common stock (305,052 shares)</link:label>
    <link:label id="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_C0C71322A5BF277796CC985E655F1CDE_label_en-US" xlink:label="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_C0C71322A5BF277796CC985E655F1CDE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Repurchased and Retired During Period, Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_C0C71322A5BF277796CC985E655F1CDE" xlink:type="locator" />
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    <link:label id="lab_ucbi_DeferredCompensationPlanNetIncludingDividendEquivalents_F20E0718D95F7FC31861984F6A2AF1CB_verboseLabel_en-US" xlink:label="lab_ucbi_DeferredCompensationPlanNetIncludingDividendEquivalents_F20E0718D95F7FC31861984F6A2AF1CB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Deferred compensation plan, net, including dividend equivalents</link:label>
    <link:label id="lab_ucbi_DeferredCompensationPlanNetIncludingDividendEquivalents_F20E0718D95F7FC31861984F6A2AF1CB_label_en-US" xlink:label="lab_ucbi_DeferredCompensationPlanNetIncludingDividendEquivalents_F20E0718D95F7FC31861984F6A2AF1CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Compensation Plan Net Including Dividend Equivalents</link:label>
    <link:label id="lab_ucbi_DeferredCompensationPlanNetIncludingDividendEquivalents_F20E0718D95F7FC31861984F6A2AF1CB_documentation_en-US" xlink:label="lab_ucbi_DeferredCompensationPlanNetIncludingDividendEquivalents_F20E0718D95F7FC31861984F6A2AF1CB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the value of deferred compensation plan, net, including dividend equivalents.</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ucbi_DeferredCompensationPlanNetIncludingDividendEquivalents_F20E0718D95F7FC31861984F6A2AF1CB" xlink:to="lab_ucbi_DeferredCompensationPlanNetIncludingDividendEquivalents_F20E0718D95F7FC31861984F6A2AF1CB" xlink:type="arc" />
    <link:label id="lab_ucbi_SharesIssuedFromDeferredCompensationPlanShares_29E7E27426BFA9D55FE6984F6A2AE264_verboseLabel_en-US" xlink:label="lab_ucbi_SharesIssuedFromDeferredCompensationPlanShares_29E7E27426BFA9D55FE6984F6A2AE264" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Shares issued from deferred compensation plan, net of shares surrendered to cover payroll taxes (70,044 shares and 45,558 shares for the periods ended March 31, 2019 and 2018, respectively)</link:label>
    <link:label id="lab_ucbi_SharesIssuedFromDeferredCompensationPlanShares_29E7E27426BFA9D55FE6984F6A2AE264_label_en-US" xlink:label="lab_ucbi_SharesIssuedFromDeferredCompensationPlanShares_29E7E27426BFA9D55FE6984F6A2AE264" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shares Issued From Deferred Compensation Plan Shares</link:label>
    <link:label id="lab_ucbi_SharesIssuedFromDeferredCompensationPlanShares_29E7E27426BFA9D55FE6984F6A2AE264_documentation_en-US" xlink:label="lab_ucbi_SharesIssuedFromDeferredCompensationPlanShares_29E7E27426BFA9D55FE6984F6A2AE264" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Shares issued from deferred compensation plan (5,687 shares).</link:label>
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    <link:label id="lab_us-gaap_DividendsCommonStockCash_B9DB4CA27009A40CE574984F6A2ADD61_negatedLabel_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash_B9DB4CA27009A40CE574984F6A2ADD61" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Common stock dividends ($0.16 per share and $0.12 per share for the periods ended March 31, 2019 and 2018, respectively)</link:label>
    <link:label id="lab_us-gaap_DividendsCommonStockCash_B9DB4CA27009A40CE574984F6A2ADD61_label_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash_B9DB4CA27009A40CE574984F6A2ADD61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends, Common Stock, Cash</link:label>
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    <link:label id="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_27EC6079154F85BE23E9984F6A2A73C7_terseLabel_en-US" xlink:label="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_27EC6079154F85BE23E9984F6A2A73C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adoption of new accounting standard</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_A2D5A422FC8D725C8A20984F6A2A5BA5" xlink:type="locator" />
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