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ACQUISITIONS (Outstanding Principal Balance and Carrying Amount of Acquired Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 01, 2014
Business Acquisition [Line Items]        
Total $ 105,788us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality $ 3,622us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality $ 4,565us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality  
StellarOne Bank [Member]        
Business Acquisition [Line Items]        
Contractually required principal and interest payments       214,803us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
Nonaccretable difference       (34,696)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
Cash flows expected to be collected       180,107us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
Accretable difference       (34,653)us-gaap_CertainLoansAcquiredInTransferAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
Total       $ 145,454us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember