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<!--XBRL document created by RR Donnelley Tagger version 10.0.0.240; Copyright (C) RR Donnelley-->
<!--Based on XBRL 2.1-->
<!--Created on: 2/28/2013 6:02:08 PM-->
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  <!--Context Section-->
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    <period>
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    <entity>
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    <period>
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  <context id="BalanceAsOf_31Dec2010_Retained_Earnings_Member">
    <entity>
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    <period>
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  <context id="BalanceAsOf_31Dec2010_Nonvoting_Common_Stock_Member">
    <entity>
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    <period>
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    <entity>
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    <period>
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  <context id="BalanceAsOf_31Dec2010_Additional_Paid_In_Capital_Member">
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    <period>
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    <period>
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    <entity>
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  <context id="BalanceAsOf_31Dec2012_Senior_Debentures_Member">
    <entity>
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    <period>
      <instant>2012-12-31</instant>
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    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
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    <period>
      <instant>2011-12-31</instant>
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    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_United_Community_Statutory_Trust_One_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
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      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_United_Community_Capital_Trust_Two_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
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      <instant>2011-12-31</instant>
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    <entity>
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      <segment>
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      <instant>2011-12-31</instant>
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    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
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      <instant>2011-12-31</instant>
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    <entity>
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    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
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      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
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      <instant>2012-12-31</instant>
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      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2012_Executive_Officers_And_Directors_Member">
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    <period>
      <instant>2012-12-31</instant>
    </period>
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  <context id="BalanceAsOf_31Dec2012_Residential_Construction_Member_Doubtful_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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    <period>
      <instant>2012-12-31</instant>
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  <context id="BalanceAsOf_31Dec2012_Residential_Construction_Member_Watch_Member">
    <entity>
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      <segment>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableTroubledDebtRestructuringAxis">ucbi:ResidentialConstructionMember</xbrldi:explicitMember>
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    <period>
      <instant>2012-12-31</instant>
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    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByPortfolioSegmentAxis">us-gaap:CommercialPortfolioSegmentMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByCreditQualityIndicatorAxis">ucbi:NotRatedMember</xbrldi:explicitMember>
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    </entity>
    <period>
      <instant>2012-12-31</instant>
    </period>
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  <context id="BalanceAsOf_31Dec2012_Consumer_Installment_Member_Substandard_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableTroubledDebtRestructuringAxis">ucbi:ConsumerInstallmentMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByCreditQualityIndicatorAxis">us-gaap:SubstandardMember</xbrldi:explicitMember>
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    <period>
      <instant>2012-12-31</instant>
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    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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    <period>
      <instant>2012-12-31</instant>
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  <context id="BalanceAsOf_31Dec2012_Consumer_Installment_Member_Doubtful_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableTroubledDebtRestructuringAxis">ucbi:ConsumerInstallmentMember</xbrldi:explicitMember>
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    <period>
      <instant>2012-12-31</instant>
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  <context id="BalanceAsOf_31Dec2012_Consumer_Installment_Member_Watch_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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    <period>
      <instant>2012-12-31</instant>
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  <context id="BalanceAsOf_31Dec2012_Substandard_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByCreditQualityIndicatorAxis">us-gaap:SubstandardMember</xbrldi:explicitMember>
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    </entity>
    <period>
      <instant>2012-12-31</instant>
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  <context id="BalanceAsOf_31Dec2012_Pass_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByCreditQualityIndicatorAxis">us-gaap:PassMember</xbrldi:explicitMember>
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    <period>
      <instant>2012-12-31</instant>
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  <context id="BalanceAsOf_31Dec2012_Doubtful_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByCreditQualityIndicatorAxis">us-gaap:DoubtfulMember</xbrldi:explicitMember>
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    <period>
      <instant>2012-12-31</instant>
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  <context id="BalanceAsOf_31Dec2012_Watch_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByCreditQualityIndicatorAxis">ucbi:WatchMember</xbrldi:explicitMember>
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    <period>
      <instant>2012-12-31</instant>
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  <context id="BalanceAsOf_31Dec2012_Not_Rated_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByCreditQualityIndicatorAxis">ucbi:NotRatedMember</xbrldi:explicitMember>
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    <period>
      <instant>2012-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_Real_Estate_Member_Commercial_Portfolio_Segment_Member_Substandard_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByPortfolioSegmentAxis">us-gaap:CommercialPortfolioSegmentMember</xbrldi:explicitMember>
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    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_Real_Estate_Member_Commercial_Portfolio_Segment_Member_Pass_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByPortfolioSegmentAxis">us-gaap:CommercialPortfolioSegmentMember</xbrldi:explicitMember>
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    </entity>
    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_Real_Estate_Member_Commercial_Portfolio_Segment_Member_Doubtful_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByPortfolioSegmentAxis">us-gaap:CommercialPortfolioSegmentMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByCreditQualityIndicatorAxis">us-gaap:DoubtfulMember</xbrldi:explicitMember>
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    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_Real_Estate_Member_Commercial_Portfolio_Segment_Member_Watch_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByCreditQualityIndicatorAxis">ucbi:WatchMember</xbrldi:explicitMember>
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    </entity>
    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_Construction_Member_Commercial_Portfolio_Segment_Member_Substandard_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByPortfolioSegmentAxis">us-gaap:CommercialPortfolioSegmentMember</xbrldi:explicitMember>
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    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_Construction_Member_Commercial_Portfolio_Segment_Member_Pass_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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    <period>
      <instant>2011-12-31</instant>
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    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
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    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_Construction_Member_Commercial_Portfolio_Segment_Member_Watch_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_And_Industrial_Member_Commercial_Portfolio_Segment_Member_Substandard_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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        <xbrldi:explicitMember dimension="us-gaap:FinancingReceivableInformationByPortfolioSegmentAxis">us-gaap:CommercialPortfolioSegmentMember</xbrldi:explicitMember>
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    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_And_Industrial_Member_Commercial_Portfolio_Segment_Member_Pass_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_And_Industrial_Member_Commercial_Portfolio_Segment_Member_Doubtful_Member">
    <entity>
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      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_And_Industrial_Member_Commercial_Portfolio_Segment_Member_Watch_Member">
    <entity>
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      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_And_Industrial_Member_Commercial_Portfolio_Segment_Member_Not_Rated_Member">
    <entity>
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    <period>
      <instant>2011-12-31</instant>
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    <entity>
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    <period>
      <instant>2011-12-31</instant>
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    <period>
      <instant>2011-12-31</instant>
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      <instant>2011-12-31</instant>
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    <entity>
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    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Residential_Mortgage_Member_Watch_Member">
    <entity>
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    <period>
      <instant>2011-12-31</instant>
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  <context id="BalanceAsOf_31Dec2011_Commercial_Portfolio_Segment_Member_Watch_Member">
    <entity>
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      <segment>
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    </entity>
    <period>
      <instant>2011-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2011_Residential_Construction_Member_Substandard_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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      </segment>
    </entity>
    <period>
      <instant>2011-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2011_Residential_Construction_Member_Pass_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
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      </segment>
    </entity>
    <period>
      <instant>2011-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2011_Residential_Construction_Member_Doubtful_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
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      <instant>2011-12-31</instant>
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      <instant>2011-12-31</instant>
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      <instant>2012-12-31</instant>
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    <entity>
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      <endDate>2010-03-31</endDate>
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      <segment>
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      <endDate>2012-12-31</endDate>
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    <entity>
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      <segment>
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    <period>
      <instant>2012-12-31</instant>
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    <period>
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      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">ucbi:UnitedCommunityStatutoryTrustOneMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_United_Community_Capital_Trust_Two_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">ucbi:UnitedCommunityCapitalTrustTwoMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_United_Community_Capital_Trust_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">ucbi:UnitedCommunityCapitalTrustMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_Two_Thousand_Two_Subordinated_Debentures_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">ucbi:TwoThousandTwoSubordinatedDebenturesMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_Two_Thousand_Twelve_Senior_Debentures_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">ucbi:TwoThousandTwelveSeniorDebenturesMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_Two_Thousand_Three_Subordinated_Debentures_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">ucbi:TwoThousandThreeSubordinatedDebenturesMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_Southern_Bancorp_Capital_Trust_One_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:DebtInstrumentAxis">ucbi:SouthernBancorpCapitalTrustOneMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_Common_Stock_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementEquityComponentsAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2010_Common_Stock_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementEquityComponentsAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2010-01-01</startDate>
      <endDate>2010-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2011_Series_G_Preferred_Stock_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesGPreferredStockMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2011-01-01</startDate>
      <endDate>2011-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2011_Series_F_Preferred_Stock_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesFPreferredStockMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2011-01-01</startDate>
      <endDate>2011-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2011_Common_Stock_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementEquityComponentsAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2011-01-01</startDate>
      <endDate>2011-12-31</endDate>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2012_Credit_Risk_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis">us-gaap:CreditRiskMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2012-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_05Dec2008">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <instant>2008-12-05</instant>
    </period>
  </context>
  <context id="BalanceAsOf_05Dec2008_Series_B_Preferred_Stock_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesBPreferredStockMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2008-12-05</instant>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_Parent_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementEquityComponentsAxis">us-gaap:ParentMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2011_Parent_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementEquityComponentsAxis">us-gaap:ParentMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2011-01-01</startDate>
      <endDate>2011-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2010_Parent_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementEquityComponentsAxis">us-gaap:ParentMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2010-01-01</startDate>
      <endDate>2010-12-31</endDate>
    </period>
  </context>
  <context id="ThreeMonthsEnded_31Mar2011">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <startDate>2011-01-01</startDate>
      <endDate>2011-03-31</endDate>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2010">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <instant>2010-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2012_Federal_Deposit_Insurance_Corporation_Member_Other_Credit_Derivatives_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:RelatedPartyTransactionsByRelatedPartyAxis">ucbi:FederalDepositInsuranceCorporationMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:BusinessAcquisitionAxis">us-gaap:OtherCreditDerivativesMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2012-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2012_Purchased_Impaired_Loans_Member_Federal_Deposit_Insurance_Corporation_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:BusinessAcquisitionAxis">ucbi:PurchasedImpairedLoansMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:RelatedPartyTransactionsByRelatedPartyAxis">ucbi:FederalDepositInsuranceCorporationMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2012-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2012_Other_Purchased_Loans_Member_Federal_Deposit_Insurance_Corporation_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:BusinessAcquisitionAxis">ucbi:OtherPurchasedLoansMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:RelatedPartyTransactionsByRelatedPartyAxis">ucbi:FederalDepositInsuranceCorporationMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2012-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2012_Federal_Deposit_Insurance_Corporation_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:RelatedPartyTransactionsByRelatedPartyAxis">ucbi:FederalDepositInsuranceCorporationMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2012-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2011_Other_Credit_Derivatives_Member_Federal_Deposit_Insurance_Corporation_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:BusinessAcquisitionAxis">us-gaap:OtherCreditDerivativesMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:RelatedPartyTransactionsByRelatedPartyAxis">ucbi:FederalDepositInsuranceCorporationMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2011-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2011_Purchased_Impaired_Loans_Member_Federal_Deposit_Insurance_Corporation_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:BusinessAcquisitionAxis">ucbi:PurchasedImpairedLoansMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:RelatedPartyTransactionsByRelatedPartyAxis">ucbi:FederalDepositInsuranceCorporationMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2011-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2011_Other_Purchased_Loans_Member_Federal_Deposit_Insurance_Corporation_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:BusinessAcquisitionAxis">ucbi:OtherPurchasedLoansMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:RelatedPartyTransactionsByRelatedPartyAxis">ucbi:FederalDepositInsuranceCorporationMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2011-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2011_Federal_Deposit_Insurance_Corporation_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:RelatedPartyTransactionsByRelatedPartyAxis">ucbi:FederalDepositInsuranceCorporationMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2011-12-31</instant>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_Fair_Value_Hedging_Member_Other_Fee_Revenue_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:DerivativeInstrumentsGainLossByHedgingRelationshipAxis">us-gaap:FairValueHedgingMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:IncomeStatementLocationAxis">ucbi:OtherFeeRevenueMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2011_Other_Fee_Revenue_Member_Fair_Value_Hedging_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:IncomeStatementLocationAxis">ucbi:OtherFeeRevenueMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:DerivativeInstrumentsGainLossByHedgingRelationshipAxis">us-gaap:FairValueHedgingMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2011-01-01</startDate>
      <endDate>2011-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2010_Other_Fee_Revenue_Member_Fair_Value_Hedging_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:IncomeStatementLocationAxis">ucbi:OtherFeeRevenueMember</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="us-gaap:DerivativeInstrumentsGainLossByHedgingRelationshipAxis">us-gaap:FairValueHedgingMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2010-01-01</startDate>
      <endDate>2010-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_Additional_Paid_In_Capital_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementEquityComponentsAxis">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2011_Additional_Paid_In_Capital_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementEquityComponentsAxis">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2011-01-01</startDate>
      <endDate>2011-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2011">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <startDate>2011-01-01</startDate>
      <endDate>2011-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2010_Additional_Paid_In_Capital_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementEquityComponentsAxis">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2010-01-01</startDate>
      <endDate>2010-12-31</endDate>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2010">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <startDate>2010-01-01</startDate>
      <endDate>2010-12-31</endDate>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2011">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <instant>2011-12-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Dec2012">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <instant>2012-12-31</instant>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012_Series_D_Preferred_Stock_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesDPreferredStockMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <context id="BalanceAsOf_30Jun2012">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <instant>2012-06-30</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Jan2013_Nonvoting_Common_Stock_Member">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
      <segment>
        <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:NonvotingCommonStockMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <instant>2013-01-31</instant>
    </period>
  </context>
  <context id="BalanceAsOf_31Jan2013">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <instant>2013-01-31</instant>
    </period>
  </context>
  <context id="TwelveMonthsEnded_31Dec2012">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000857855</identifier>
    </entity>
    <period>
      <startDate>2012-01-01</startDate>
      <endDate>2012-12-31</endDate>
    </period>
  </context>
  <!--Unit Section-->
  <unit id="Segments">
    <measure>ucbi:Segments</measure>
  </unit>
  <unit id="Derivative_Instruments">
    <measure>ucbi:Derivative_Instruments</measure>
  </unit>
  <unit id="Investment">
    <measure>ucbi:Investment</measure>
  </unit>
  <unit id="Contract">
    <measure>ucbi:Contract</measure>
  </unit>
  <unit id="Securities">
    <measure>ucbi:Securities</measure>
  </unit>
  <unit id="USDEPS">
    <divide>
      <unitNumerator>
        <measure>iso4217:USD</measure>
      </unitNumerator>
      <unitDenominator>
        <measure>xbrli:shares</measure>
      </unitDenominator>
    </divide>
  </unit>
  <unit id="USDPU">
    <divide>
      <unitNumerator>
        <measure>iso4217:USD</measure>
      </unitNumerator>
      <unitDenominator>
        <measure>ucbi:units</measure>
      </unitDenominator>
    </divide>
  </unit>
  <unit id="Pure">
    <measure>xbrli:pure</measure>
  </unit>
  <unit id="USD">
    <measure>iso4217:USD</measure>
  </unit>
  <unit id="Shares">
    <measure>xbrli:shares</measure>
  </unit>
  <!--Tuple Section-->
  <!--Element Section-->
  <dei:AmendmentFlag contextRef="TwelveMonthsEnded_31Dec2012">false</dei:AmendmentFlag>
  <dei:CurrentFiscalYearEndDate contextRef="TwelveMonthsEnded_31Dec2012">--12-31</dei:CurrentFiscalYearEndDate>
  <dei:DocumentFiscalPeriodFocus contextRef="TwelveMonthsEnded_31Dec2012">FY</dei:DocumentFiscalPeriodFocus>
  <dei:DocumentFiscalYearFocus contextRef="TwelveMonthsEnded_31Dec2012">2012</dei:DocumentFiscalYearFocus>
  <dei:DocumentPeriodEndDate contextRef="TwelveMonthsEnded_31Dec2012">2012-12-31</dei:DocumentPeriodEndDate>
  <dei:DocumentType contextRef="TwelveMonthsEnded_31Dec2012">10-K</dei:DocumentType>
  <dei:EntityCentralIndexKey contextRef="TwelveMonthsEnded_31Dec2012">0000857855</dei:EntityCentralIndexKey>
  <dei:EntityCommonStockSharesOutstanding contextRef="BalanceAsOf_31Jan2013" unitRef="Shares" decimals="INF">42435474</dei:EntityCommonStockSharesOutstanding>
  <dei:EntityCommonStockSharesOutstanding contextRef="BalanceAsOf_31Jan2013_Nonvoting_Common_Stock_Member" unitRef="Shares" decimals="INF">15316794</dei:EntityCommonStockSharesOutstanding>
  <dei:EntityCurrentReportingStatus contextRef="TwelveMonthsEnded_31Dec2012">Yes</dei:EntityCurrentReportingStatus>
  <dei:EntityFilerCategory contextRef="TwelveMonthsEnded_31Dec2012">Accelerated Filer</dei:EntityFilerCategory>
  <dei:EntityPublicFloat contextRef="BalanceAsOf_30Jun2012" unitRef="USD" decimals="0">483964000</dei:EntityPublicFloat>
  <dei:EntityRegistrantName contextRef="TwelveMonthsEnded_31Dec2012">UNITED COMMUNITY BANKS INC</dei:EntityRegistrantName>
  <dei:EntityVoluntaryFilers contextRef="TwelveMonthsEnded_31Dec2012">No</dei:EntityVoluntaryFilers>
  <dei:EntityWellKnownSeasonedIssuer contextRef="TwelveMonthsEnded_31Dec2012">No</dei:EntityWellKnownSeasonedIssuer>
  <invest:InvestmentWarrantsExpirationDate contextRef="TwelveMonthsEnded_31Dec2012_Series_D_Preferred_Stock_Member">2013-08-22</invest:InvestmentWarrantsExpirationDate>
  <ucbi:AccruingSubstandardRelationship contextRef="BalanceAsOf_31Dec2012" unitRef="USD" decimals="-6">2000000</ucbi:AccruingSubstandardRelationship>
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  <ucbi:AllowanceForLoanLosses contextRef="BalanceAsOf_31Dec2012" unitRef="USD" decimals="0">0</ucbi:AllowanceForLoanLosses>
  <ucbi:AmortizationOfStockOptionAndRestrictedStock contextRef="TwelveMonthsEnded_31Dec2010" unitRef="USD" decimals="-3">2459000</ucbi:AmortizationOfStockOptionAndRestrictedStock>
  <ucbi:AmortizationOfStockOptionAndRestrictedStock contextRef="TwelveMonthsEnded_31Dec2010_Additional_Paid_In_Capital_Member" unitRef="USD" decimals="-3">2459000</ucbi:AmortizationOfStockOptionAndRestrictedStock>
  <ucbi:AmortizationOfStockOptionAndRestrictedStock contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">2144000</ucbi:AmortizationOfStockOptionAndRestrictedStock>
  <ucbi:AmortizationOfStockOptionAndRestrictedStock contextRef="TwelveMonthsEnded_31Dec2011_Additional_Paid_In_Capital_Member" unitRef="USD" decimals="-3">2144000</ucbi:AmortizationOfStockOptionAndRestrictedStock>
  <ucbi:AmortizationOfStockOptionAndRestrictedStock contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="-3">1976000</ucbi:AmortizationOfStockOptionAndRestrictedStock>
  <ucbi:AmortizationOfStockOptionAndRestrictedStock contextRef="TwelveMonthsEnded_31Dec2012_Additional_Paid_In_Capital_Member" unitRef="USD" decimals="-3">1976000</ucbi:AmortizationOfStockOptionAndRestrictedStock>
  <ucbi:AmountOfGainLossRecognizedInIncomeOnHedgedItem contextRef="TwelveMonthsEnded_31Dec2010_Other_Fee_Revenue_Member_Fair_Value_Hedging_Member" unitRef="USD" decimals="-3">3975000</ucbi:AmountOfGainLossRecognizedInIncomeOnHedgedItem>
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  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2011" unitRef="USD" decimals="-3">78145000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2011_Federal_Deposit_Insurance_Corporation_Member" unitRef="USD" decimals="-3">78145000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2011_Other_Purchased_Loans_Member_Federal_Deposit_Insurance_Corporation_Member" unitRef="USD" decimals="-3">53785000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2011_Purchased_Impaired_Loans_Member_Federal_Deposit_Insurance_Corporation_Member" unitRef="USD" decimals="-3">697000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2011_Other_Credit_Derivatives_Member_Federal_Deposit_Insurance_Corporation_Member" unitRef="USD" decimals="-3">23663000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2012" unitRef="USD" decimals="-3">47467000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2012_Federal_Deposit_Insurance_Corporation_Member" unitRef="USD" decimals="-3">47467000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2012_Other_Purchased_Loans_Member_Federal_Deposit_Insurance_Corporation_Member" unitRef="USD" decimals="-3">32895000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2012_Purchased_Impaired_Loans_Member_Federal_Deposit_Insurance_Corporation_Member" unitRef="USD" decimals="-3">521000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AssetsCoveredByLossSharingAgreementsWithFdic contextRef="BalanceAsOf_31Dec2012_Federal_Deposit_Insurance_Corporation_Member_Other_Credit_Derivatives_Member" unitRef="USD" decimals="-3">14051000</ucbi:AssetsCoveredByLossSharingAgreementsWithFdic>
  <ucbi:AvailableForSaleSecuritiesTransfersToHeldToMaturityFairValue contextRef="BalanceAsOf_31Dec2010" unitRef="USD" decimals="-6">315000000</ucbi:AvailableForSaleSecuritiesTransfersToHeldToMaturityFairValue>
  <ucbi:AvailableForSaleSecuritiesTransfersToHeldToMaturityUnrealizedGains contextRef="BalanceAsOf_31Dec2010" unitRef="USD" decimals="-5">7100000</ucbi:AvailableForSaleSecuritiesTransfersToHeldToMaturityUnrealizedGains>
  <ucbi:BalanceAsPercentageOfOriginalLoanUnpaidPrincipal contextRef="BalanceAsOf_31Dec2011" unitRef="Pure" decimals="3">0.359</ucbi:BalanceAsPercentageOfOriginalLoanUnpaidPrincipal>
  <ucbi:BalanceAsPercentageOfOriginalLoanUnpaidPrincipal contextRef="BalanceAsOf_31Dec2012" unitRef="Pure" decimals="3">0.397</ucbi:BalanceAsPercentageOfOriginalLoanUnpaidPrincipal>
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  <ucbi:Brokered contextRef="BalanceAsOf_31Dec2012" unitRef="USD" decimals="-3">245033000</ucbi:Brokered>
  <ucbi:BulkSaleInClassifiedLoans contextRef="ThreeMonthsEnded_31Mar2011" unitRef="USD" decimals="-6">267000000</ucbi:BulkSaleInClassifiedLoans>
  <ucbi:CashDividendsOnSeriesBPreferredStock contextRef="TwelveMonthsEnded_31Dec2010" unitRef="USD" decimals="-3">-9000000</ucbi:CashDividendsOnSeriesBPreferredStock>
  <ucbi:CashDividendsOnSeriesBPreferredStock contextRef="TwelveMonthsEnded_31Dec2010_Parent_Member" unitRef="USD" decimals="-3">-9000000</ucbi:CashDividendsOnSeriesBPreferredStock>
  <ucbi:CashDividendsOnSeriesBPreferredStock contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">-9020000</ucbi:CashDividendsOnSeriesBPreferredStock>
  <ucbi:CashDividendsOnSeriesBPreferredStock contextRef="TwelveMonthsEnded_31Dec2011_Parent_Member" unitRef="USD" decimals="-3">-9020000</ucbi:CashDividendsOnSeriesBPreferredStock>
  <ucbi:CashDividendsOnSeriesBPreferredStock contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="-3">-9000000</ucbi:CashDividendsOnSeriesBPreferredStock>
  <ucbi:CashDividendsOnSeriesBPreferredStock contextRef="TwelveMonthsEnded_31Dec2012_Parent_Member" unitRef="USD" decimals="-3">-9000000</ucbi:CashDividendsOnSeriesBPreferredStock>
  <ucbi:CashDividendsOnSeriesDPreferredStock contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">-1210000</ucbi:CashDividendsOnSeriesDPreferredStock>
  <ucbi:CashDividendsOnSeriesDPreferredStock contextRef="TwelveMonthsEnded_31Dec2011_Parent_Member" unitRef="USD" decimals="-3">-1210000</ucbi:CashDividendsOnSeriesDPreferredStock>
  <ucbi:CashDividendsOnSeriesDPreferredStock contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="-3">-1687000</ucbi:CashDividendsOnSeriesDPreferredStock>
  <ucbi:CashDividendsOnSeriesDPreferredStock contextRef="TwelveMonthsEnded_31Dec2012_Parent_Member" unitRef="USD" decimals="-3">-1687000</ucbi:CashDividendsOnSeriesDPreferredStock>
  <ucbi:CashDividendsOnSeriesPreferredStock contextRef="TwelveMonthsEnded_31Dec2010" unitRef="USD" decimals="-3">-13000</ucbi:CashDividendsOnSeriesPreferredStock>
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  <ucbi:CashDividendsOnSeriesPreferredStock contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">-13000</ucbi:CashDividendsOnSeriesPreferredStock>
  <ucbi:CashDividendsOnSeriesPreferredStock contextRef="TwelveMonthsEnded_31Dec2011_Parent_Member" unitRef="USD" decimals="-3">-13000</ucbi:CashDividendsOnSeriesPreferredStock>
  <ucbi:CashDividendsOnSeriesPreferredStock contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="-3">-12000</ucbi:CashDividendsOnSeriesPreferredStock>
  <ucbi:CashDividendsOnSeriesPreferredStock contextRef="TwelveMonthsEnded_31Dec2012_Parent_Member" unitRef="USD" decimals="-3">-12000</ucbi:CashDividendsOnSeriesPreferredStock>
  <ucbi:ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights contextRef="BalanceAsOf_05Dec2008_Series_B_Preferred_Stock_Member" unitRef="USDPU" decimals="2">61.40</ucbi:ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights>
  <ucbi:ClassOfWarrantOrRightNumberOfReducedSecuritiesCalledByWarrantsOrRights contextRef="BalanceAsOf_05Dec2008" unitRef="Shares" decimals="INF">219909</ucbi:ClassOfWarrantOrRightNumberOfReducedSecuritiesCalledByWarrantsOrRights>
  <ucbi:ClassOfWarrantOrRightNumberOfReducedSecuritiesCalledByWarrantsOrRights contextRef="BalanceAsOf_05Dec2008_Series_B_Preferred_Stock_Member" unitRef="Shares" decimals="INF">219909</ucbi:ClassOfWarrantOrRightNumberOfReducedSecuritiesCalledByWarrantsOrRights>
  <ucbi:CollateralPledgedTowardDerivatives contextRef="BalanceAsOf_31Dec2012_Credit_Risk_Member" unitRef="USD" decimals="-5">11500000</ucbi:CollateralPledgedTowardDerivatives>
  <ucbi:CommissionChargesOnPurchaseShares contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="0">0</ucbi:CommissionChargesOnPurchaseShares>
  <ucbi:CommitmentToLendAdditionalAmountsToCustomers contextRef="BalanceAsOf_31Dec2011" unitRef="USD" decimals="-4">1120000</ucbi:CommitmentToLendAdditionalAmountsToCustomers>
  <ucbi:CommitmentToLendAdditionalAmountsToCustomers contextRef="BalanceAsOf_31Dec2012" unitRef="USD" decimals="0">689000</ucbi:CommitmentToLendAdditionalAmountsToCustomers>
  <ucbi:CommonAndPreferredStockIssuedValue contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">361560000</ucbi:CommonAndPreferredStockIssuedValue>
  <ucbi:CommonAndPreferredStockIssuedValue contextRef="TwelveMonthsEnded_31Dec2011_Additional_Paid_In_Capital_Member" unitRef="USD" decimals="-3">11035000</ucbi:CommonAndPreferredStockIssuedValue>
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  <ucbi:CommonAndPreferredStockSharesIssued contextRef="TwelveMonthsEnded_31Dec2011_Series_F_Preferred_Stock_Member" unitRef="Shares" decimals="INF">3467699</ucbi:CommonAndPreferredStockSharesIssued>
  <ucbi:CommonAndPreferredStockSharesIssued contextRef="TwelveMonthsEnded_31Dec2011_Series_G_Preferred_Stock_Member" unitRef="Shares" decimals="INF">3467699</ucbi:CommonAndPreferredStockSharesIssued>
  <ucbi:CommonStockIssuableShares contextRef="BalanceAsOf_31Dec2011" unitRef="Shares" decimals="INF">93681</ucbi:CommonStockIssuableShares>
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  <ucbi:CommonStockIssuedDuringPeriodSharesReverseStockSplits contextRef="TwelveMonthsEnded_31Dec2012">1-for-5</ucbi:CommonStockIssuedDuringPeriodSharesReverseStockSplits>
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  <ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares contextRef="TwelveMonthsEnded_31Dec2010_Additional_Paid_In_Capital_Member" unitRef="USD" decimals="-3">1713000</ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares>
  <ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares contextRef="TwelveMonthsEnded_31Dec2010_Common_Stock_Member" unitRef="USD" decimals="-3">122000</ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares>
  <ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">1453000</ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares>
  <ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares contextRef="TwelveMonthsEnded_31Dec2011_Additional_Paid_In_Capital_Member" unitRef="USD" decimals="-3">1297000</ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares>
  <ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares contextRef="TwelveMonthsEnded_31Dec2011_Common_Stock_Member" unitRef="USD" decimals="-3">156000</ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares>
  <ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="-3">900000</ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares>
  <ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares contextRef="TwelveMonthsEnded_31Dec2012_Additional_Paid_In_Capital_Member" unitRef="USD" decimals="-3">790000</ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares>
  <ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares contextRef="TwelveMonthsEnded_31Dec2012_Common_Stock_Member" unitRef="USD" decimals="-3">110000</ucbi:CommonStockIssuedToDividendReinvestmentPlanAndEmployeeBenefitPlansShares>
  <ucbi:CommonStocksIssuable contextRef="BalanceAsOf_31Dec2011" unitRef="USD" decimals="-3">3233000</ucbi:CommonStocksIssuable>
  <ucbi:CommonStocksIssuable contextRef="BalanceAsOf_31Dec2012" unitRef="USD" decimals="-3">3119000</ucbi:CommonStocksIssuable>
  <ucbi:CommunicationsAndEquipment contextRef="TwelveMonthsEnded_31Dec2010" unitRef="USD" decimals="-3">13781000</ucbi:CommunicationsAndEquipment>
  <ucbi:CommunicationsAndEquipment contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">13135000</ucbi:CommunicationsAndEquipment>
  <ucbi:CommunicationsAndEquipment contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="-3">12940000</ucbi:CommunicationsAndEquipment>
  <ucbi:ComprehensiveIncomeBeforeTax contextRef="TwelveMonthsEnded_31Dec2010" unitRef="USD" decimals="-3">-457197000</ucbi:ComprehensiveIncomeBeforeTax>
  <ucbi:ComprehensiveIncomeBeforeTax contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">-254889000</ucbi:ComprehensiveIncomeBeforeTax>
  <ucbi:ComprehensiveIncomeBeforeTax contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="-3">14575000</ucbi:ComprehensiveIncomeBeforeTax>
  <ucbi:ComprehensiveIncomeTax contextRef="TwelveMonthsEnded_31Dec2010" unitRef="USD" decimals="-3">-71931000</ucbi:ComprehensiveIncomeTax>
  <ucbi:ComprehensiveIncomeTax contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">3983000</ucbi:ComprehensiveIncomeTax>
  <ucbi:ComprehensiveIncomeTax contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="-3">-1050000</ucbi:ComprehensiveIncomeTax>
  <ucbi:DailyAverageBalanceOfBrokeredDeposits contextRef="BalanceAsOf_31Dec2011" unitRef="USD" decimals="-6">401000000</ucbi:DailyAverageBalanceOfBrokeredDeposits>
  <ucbi:DailyAverageBalanceOfBrokeredDeposits contextRef="BalanceAsOf_31Dec2012" unitRef="USD" decimals="-6">156000000</ucbi:DailyAverageBalanceOfBrokeredDeposits>
  <ucbi:DebtInstrumentEarliestCallYear contextRef="TwelveMonthsEnded_31Dec2012_Southern_Bancorp_Capital_Trust_One_Member">2009</ucbi:DebtInstrumentEarliestCallYear>
  <ucbi:DebtInstrumentEarliestCallYear contextRef="TwelveMonthsEnded_31Dec2012_Two_Thousand_Three_Subordinated_Debentures_Member">2010</ucbi:DebtInstrumentEarliestCallYear>
  <ucbi:DebtInstrumentEarliestCallYear contextRef="TwelveMonthsEnded_31Dec2012_Two_Thousand_Twelve_Senior_Debentures_Member">2017</ucbi:DebtInstrumentEarliestCallYear>
  <ucbi:DebtInstrumentEarliestCallYear contextRef="TwelveMonthsEnded_31Dec2012_Two_Thousand_Two_Subordinated_Debentures_Member">2012</ucbi:DebtInstrumentEarliestCallYear>
  <ucbi:DebtInstrumentEarliestCallYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Capital_Trust_Member">2008</ucbi:DebtInstrumentEarliestCallYear>
  <ucbi:DebtInstrumentEarliestCallYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Capital_Trust_Two_Member">2010</ucbi:DebtInstrumentEarliestCallYear>
  <ucbi:DebtInstrumentEarliestCallYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Statutory_Trust_One_Member">2010</ucbi:DebtInstrumentEarliestCallYear>
  <ucbi:DebtInstrumentEarliestCallYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Statutory_Trust_Three_Member">2013</ucbi:DebtInstrumentEarliestCallYear>
  <ucbi:DebtInstrumentEarliestCallYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Statutory_Trust_Two_Member">2013</ucbi:DebtInstrumentEarliestCallYear>
  <ucbi:DebtInstrumentIssueYear contextRef="TwelveMonthsEnded_31Dec2012_Southern_Bancorp_Capital_Trust_One_Member">2004</ucbi:DebtInstrumentIssueYear>
  <ucbi:DebtInstrumentIssueYear contextRef="TwelveMonthsEnded_31Dec2012_Two_Thousand_Three_Subordinated_Debentures_Member">2003</ucbi:DebtInstrumentIssueYear>
  <ucbi:DebtInstrumentIssueYear contextRef="TwelveMonthsEnded_31Dec2012_Two_Thousand_Twelve_Senior_Debentures_Member">2012</ucbi:DebtInstrumentIssueYear>
  <ucbi:DebtInstrumentIssueYear contextRef="TwelveMonthsEnded_31Dec2012_Two_Thousand_Two_Subordinated_Debentures_Member">2002</ucbi:DebtInstrumentIssueYear>
  <ucbi:DebtInstrumentIssueYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Capital_Trust_Member">1998</ucbi:DebtInstrumentIssueYear>
  <ucbi:DebtInstrumentIssueYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Capital_Trust_Two_Member">2000</ucbi:DebtInstrumentIssueYear>
  <ucbi:DebtInstrumentIssueYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Statutory_Trust_One_Member">2000</ucbi:DebtInstrumentIssueYear>
  <ucbi:DebtInstrumentIssueYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Statutory_Trust_Three_Member">2008</ucbi:DebtInstrumentIssueYear>
  <ucbi:DebtInstrumentIssueYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Statutory_Trust_Two_Member">2008</ucbi:DebtInstrumentIssueYear>
  <ucbi:DebtInstrumentsMaturityYear contextRef="TwelveMonthsEnded_31Dec2012_Southern_Bancorp_Capital_Trust_One_Member">2034</ucbi:DebtInstrumentsMaturityYear>
  <ucbi:DebtInstrumentsMaturityYear contextRef="TwelveMonthsEnded_31Dec2012_Two_Thousand_Three_Subordinated_Debentures_Member">2015</ucbi:DebtInstrumentsMaturityYear>
  <ucbi:DebtInstrumentsMaturityYear contextRef="TwelveMonthsEnded_31Dec2012_Two_Thousand_Twelve_Senior_Debentures_Member">2017</ucbi:DebtInstrumentsMaturityYear>
  <ucbi:DebtInstrumentsMaturityYear contextRef="TwelveMonthsEnded_31Dec2012_Two_Thousand_Two_Subordinated_Debentures_Member">2012</ucbi:DebtInstrumentsMaturityYear>
  <ucbi:DebtInstrumentsMaturityYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Capital_Trust_Member">2028</ucbi:DebtInstrumentsMaturityYear>
  <ucbi:DebtInstrumentsMaturityYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Capital_Trust_Two_Member">2030</ucbi:DebtInstrumentsMaturityYear>
  <ucbi:DebtInstrumentsMaturityYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Statutory_Trust_One_Member">2030</ucbi:DebtInstrumentsMaturityYear>
  <ucbi:DebtInstrumentsMaturityYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Statutory_Trust_Three_Member">2038</ucbi:DebtInstrumentsMaturityYear>
  <ucbi:DebtInstrumentsMaturityYear contextRef="TwelveMonthsEnded_31Dec2012_United_Community_Statutory_Trust_Two_Member">2038</ucbi:DebtInstrumentsMaturityYear>
  <ucbi:Deferred contextRef="TwelveMonthsEnded_31Dec2010" unitRef="USD" decimals="-3">-88124000</ucbi:Deferred>
  <ucbi:Deferred contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">-94808000</ucbi:Deferred>
  <ucbi:Deferred contextRef="TwelveMonthsEnded_31Dec2012" unitRef="USD" decimals="-3">9446000</ucbi:Deferred>
  <ucbi:DeferredCompensationArrangementsWithIndividualRequisiteServicePeriod contextRef="TwelveMonthsEnded_31Dec2012">P1Y</ucbi:DeferredCompensationArrangementsWithIndividualRequisiteServicePeriod>
  <ucbi:DeferredCompensationArrangementWithIndividualRequisiteVestingPeriod contextRef="TwelveMonthsEnded_31Dec2012">P3Y</ucbi:DeferredCompensationArrangementWithIndividualRequisiteVestingPeriod>
  <ucbi:DeferredCompensationPlanNetIncludingDividendEquivalents contextRef="TwelveMonthsEnded_31Dec2010" unitRef="USD" decimals="-3">295000</ucbi:DeferredCompensationPlanNetIncludingDividendEquivalents>
  <ucbi:DeferredCompensationPlanNetIncludingDividendEquivalents contextRef="TwelveMonthsEnded_31Dec2010_Common_Stock_Issuable_Member" unitRef="USD" decimals="-3">295000</ucbi:DeferredCompensationPlanNetIncludingDividendEquivalents>
  <ucbi:DeferredCompensationPlanNetIncludingDividendEquivalents contextRef="TwelveMonthsEnded_31Dec2011" unitRef="USD" decimals="-3">241000</ucbi:DeferredCompensationPlanNetIncludingDividendEquivalents>
  <ucbi:DeferredCompensationPlanNetIncludingDividendEquivalents contextRef="TwelveMonthsEnded_31Dec2011_Common_Stock_Issuable_Member" unitRef="USD" decimals="-3">241000</ucbi:DeferredCompensationPlanNetIncludingDividendEquivalents>
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  <!--Footnote Section-->
</xbrl>
