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ACQUISITIONS (Schedule of Effect of Amortization and Accretion Related to Acquisition) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
ACQUISITIONS [Abstract]    
Loans $ 639ubsh_NetImpactOfLoansAccretionRelatedToAcquisition $ (546)ubsh_NetImpactOfLoansAccretionRelatedToAcquisition
Core deposit intangibles (2,222)ubsh_NetImpactOfCoreDepositIntangibleAmortizationRelatedToAcquisition (2,616)ubsh_NetImpactOfCoreDepositIntangibleAmortizationRelatedToAcquisition
Borrowings 137ubsh_NetImpactOfBorrowingsAccretionRelatedToAcquisition 75ubsh_NetImpactOfBorrowingsAccretionRelatedToAcquisition
Time deposits 1,075ubsh_NetImpactOfTimeDepositsAccretionRelatedToAcquisition 2,920ubsh_NetImpactOfTimeDepositsAccretionRelatedToAcquisition
Net impact to income before taxes $ (371)ubsh_NetImpactOfAmortizationAndAccretionRelatedToAcquisition $ (167)ubsh_NetImpactOfAmortizationAndAccretionRelatedToAcquisition