Quarterly report pursuant to Section 13 or 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Change in Accumulated Other Comprehensive Income) (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Change in Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Change in accumulated other comprehensive income    
Unrealized Gains (losses) on Securities, Beginning Balance $ 17,439us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 1,192us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in Fair Value of Cash Flow Hedge, Beginning Balance (5,184)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (3,382)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Total, Beginning Balance 12,255us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (2,190)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income (loss) before reclass, Unrealized Gains (losses) on Securities 3,783us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 6,313us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Other comprehensive income (loss) before reclass, Change in Fair Value of Cash Flow Hedge (1,490)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 575us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Other comprehensive income (loss) before reclass, Total 2,293ubsh_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsNetOfTax 6,888ubsh_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsNetOfTax
Amounts reclassified from accumulated other comprehensive income, Unrealized Gains (losses) on Securities (125)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (19)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Amounts reclassified from accumulated other comprehensive income, Change in Fair Value of Cash Flow Hedge 272us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 47us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Amounts reclassified from accumulated other comprehensive income 147ubsh_OtherComprehensiveIncomeLossReclassificationAdjustmentsNetOfTax 28ubsh_OtherComprehensiveIncomeLossReclassificationAdjustmentsNetOfTax
Net current period other comprehensive income (loss), Unrealized Gains (losses) on Securities 3,658us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 6,294us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net current period other comprehensive income (loss), Change in Fair Value of Cash Flow Hedge (1,218)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 622us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Other comprehensive income (loss) 2,440us-gaap_OtherComprehensiveIncomeLossNetOfTax 6,916us-gaap_OtherComprehensiveIncomeLossNetOfTax
Unrealized Gains (losses) on Securities, Ending Balance 21,097us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 7,486us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in Fair Value of Cash Flow Hedge, Ending Balance (6,402)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (2,760)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Total, Ending Balance $ 14,695us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 4,726us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax