Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS (Narrative) (Details)

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FAIR VALUE MEASUREMENTS (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
FAIR VALUE MEASUREMENTS [Abstract]      
Weighted average pull through rate 90.00%ubsh_WeightedAveragePullThroughRate    
Minimum number of market participants 4,000ubsh_MinimumNumberOfMarketParticipants 4,000ubsh_MinimumNumberOfMarketParticipants  
Total valuation expenses related to OREO properties $ 7,646,000ubsh_ValuationExpensesRelatedToOtherRealEstateOwnedProperties $ 791,000ubsh_ValuationExpensesRelatedToOtherRealEstateOwnedProperties $ 301,000ubsh_ValuationExpensesRelatedToOtherRealEstateOwnedProperties
Nonrecurring fair value adjustments recorded on loans held for sale $ 286,000us-gaap_ValuationAllowancesAndReservesAdjustments $ 363,000us-gaap_ValuationAllowancesAndReservesAdjustments