Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Narrative) (Details)

v2.4.1.9
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Abstract]        
OTTI recovery amount $ 400,000ubsh_OtherThanTemporaryImpairmentRecovery      
Reclassifications of unrealized gains (losses) on AFS   1,695,000us-gaap_GainLossOnSaleOfSecuritiesNet 21,000us-gaap_GainLossOnSaleOfSecuritiesNet 190,000us-gaap_GainLossOnSaleOfSecuritiesNet
Net gain (loss) on sale of securities, excluding OTTI recovery   1,300,000ubsh_GainLossOnSaleOfSecuritiesNetExcludingOtherThanTemporaryImpairment    
Tax expense (benefit) related to (gains) losses on the sale of securities   453,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 7,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 67,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Reclassification of unrealized gains (losses) on cash flow hedges   (909,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet (805,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet (1,100,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Tax expense (benefit) related to (gains) losses on the cash flow hedges   $ (318,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax $ (281,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax $ (391,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax