Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Narrative) (Details)

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FAIR VALUE MEASUREMENTS (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
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Mar. 31, 2014
Dec. 31, 2014
FAIR VALUE MEASUREMENTS [Abstract]      
Weighted average pull through rate 80.00%ubsh_WeightedAveragePullThroughRate   90.00%ubsh_WeightedAveragePullThroughRate
Minimum number of market participants 4,000ubsh_MinimumNumberOfMarketParticipants    
Nonrecurring fair value adjustments recorded on loans held for sale $ 17,000us-gaap_ValuationAllowancesAndReservesAdjustments $ 44,000us-gaap_ValuationAllowancesAndReservesAdjustments  
Total valuation expenses related to OREO properties $ 590,000ubsh_ValuationExpensesRelatedToOtherRealEstateOwnedProperties $ 256,000ubsh_ValuationExpensesRelatedToOtherRealEstateOwnedProperties