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ACQUISITIONS (Schedule of Effect of Amortization and Accretion Related to Acquisition) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
ACQUISITIONS [Abstract]    
Loans $ 586ubsh_NetImpactOfLoansAccretionRelatedToAcquisition $ 2,728ubsh_NetImpactOfLoansAccretionRelatedToAcquisition
Core deposit intangibles (9,795)ubsh_NetImpactOfCoreDepositIntangibleAmortizationRelatedToAcquisition (3,831)ubsh_NetImpactOfCoreDepositIntangibleAmortizationRelatedToAcquisition
Borrowings 550ubsh_NetImpactOfBorrowingsAccretionRelatedToAcquisition (489)ubsh_NetImpactOfBorrowingsAccretionRelatedToAcquisition
Time deposits 8,914ubsh_NetImpactOfTimeDepositsAccretionRelatedToAcquisition 7ubsh_NetImpactOfTimeDepositsAccretionRelatedToAcquisition
Net impact to income before taxes $ 255ubsh_NetImpactOfAmortizationAndAccretionRelatedToAcquisition $ (1,585)ubsh_NetImpactOfAmortizationAndAccretionRelatedToAcquisition