Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Narrative) (Details)

v2.4.1.9
BORROWINGS (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Securities pledged as collateral for customer repurchase agreements $ 53,700,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral $ 51,800,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Remaining available balance for the federal funds lines 175,000,000ubsh_FederalFundsLinesAvailableBalance 150,000,000ubsh_FederalFundsLinesAvailableBalance
Maximum collateral dependent line of credit with the FHLB 1,500,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable 1,400,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
Prepayment penalty 19,600,000us-gaap_PrepaymentFeesOnAdvancesNet  
Prepayment penalty amortization expense 447,000ubsh_DebtInstrumentAmortizationExpense 436,000ubsh_DebtInstrumentAmortizationExpense
Carrying value of the loans and securities pledged as collateral for FHLB 1,700,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 1,600,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Acquisitions, Prior To 2006 [Member]    
Number of bank acquisitions 2us-gaap_NumberOfBusinessesAcquired
/ us-gaap_StatementScenarioAxis
= ubsh_PriorToTwoThousandAndSixMember
 
Trust preferred capital notes principal balance 58,500,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
/ us-gaap_StatementScenarioAxis
= ubsh_PriorToTwoThousandAndSixMember
 
Remaining fair value discount on subordinated debt 530,000ubsh_RemainingFairValueDiscountOnSubordinatedDebt
/ us-gaap_StatementScenarioAxis
= ubsh_PriorToTwoThousandAndSixMember
 
Subordinated debt interest rate basis LIBOR plus 1.45%  
Subordinated debt maturity date Apr. 01, 2016  
Subordinated debt 17,500,000us-gaap_SubordinatedLongTermDebt
/ us-gaap_StatementScenarioAxis
= ubsh_PriorToTwoThousandAndSixMember
 
LIBOR [Member] | Acquisitions, Prior To 2006 [Member]    
Spread on 3-Month LIBOR 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_StatementScenarioAxis
= ubsh_PriorToTwoThousandAndSixMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
StellarOne Bank [Member]    
Trust preferred capital notes principal balance 32,000,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
 
Remaining fair value discount on acquired trust preferred capital notes 7,200,000ubsh_RemainingFairValueDiscountOnAcquiredTrustPreferredCapitalNotes
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
 
Loans from Other Federal Home Loan Banks 70,000,000us-gaap_LoansFromOtherFederalHomeLoanBanks
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
 
Remaining fair value premium on acquired FHLB advances $ 1,900,000ubsh_RemainingFairValuePremiumOnAcquiredFhlbAdvances
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember