Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVES (Narrative) (Details)

v2.4.1.9
DERIVATIVES (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Minimum [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate lock commitments period 30 days  
Maximum [Member]    
Derivatives, Fair Value [Line Items]    
Interest rate lock commitments period 120 days  
Trust Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 68,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ubsh_TrustSwapsMember
 
Average fixed rate 2.77%us-gaap_DerivativeAverageFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ubsh_TrustSwapsMember
 
Number of interest rate swaps 3us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeByNatureAxis
= ubsh_TrustSwapsMember
 
Deposits with other financial institutions serves as collateral 5,700,000ubsh_DepositsWithOtherFinancialInstitutionsServesAsCollateralForCashFlowHedge
/ us-gaap_DerivativeByNatureAxis
= ubsh_TrustSwapsMember
 
Trust Swaps [Member] | Minimum [Member]    
Derivatives, Fair Value [Line Items]    
Derivative term 3 years  
Trust Swaps [Member] | Maximum [Member]    
Derivatives, Fair Value [Line Items]    
Derivative term 6 years  
Interest Rate Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Market value of securities pledged as collateral for derivative instruments 6,700,000ubsh_MarketValueOfSecuritiesPledgedAsCollateralForDerivativeInstruments
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
 
Deposits with other financial institutions serves as collateral 3,500,000ubsh_DepositsWithOtherFinancialInstitutionsServesAsCollateralForCashFlowHedge
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
 
Cash Flow Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 263,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CashFlowHedgingMember
 
Number of interest rate swaps 11us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CashFlowHedgingMember
 
Unrealized loss of fair value of the cash flow hedges (9,700,000)us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CashFlowHedgingMember
 
Prime Loan Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 55,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ubsh_PrimeLoanSwapsMember
 
Number of loan swaps with floor rates 1ubsh_PrimeLoanSwapsWithFloorRates
/ us-gaap_DerivativeByNatureAxis
= ubsh_PrimeLoanSwapsMember
 
Number of interest rate swaps 4us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeByNatureAxis
= ubsh_PrimeLoanSwapsMember
 
Derivative term 6 years  
Interest rate spread calculated on the variable rate 0.49%us-gaap_DerivativeHigherRangeOfBasisSpreadOnVariableRate
/ us-gaap_DerivativeByNatureAxis
= ubsh_PrimeLoanSwapsMember
 
Interest rate swaps agreement, effective date Sep. 17, 2013  
Prime Loan Swaps [Member] | Minimum [Member]    
Derivatives, Fair Value [Line Items]    
Fixed rate 4.71%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ubsh_PrimeLoanSwapsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Floor interest rate 4.00%us-gaap_DerivativeFloorInterestRate
/ us-gaap_DerivativeByNatureAxis
= ubsh_PrimeLoanSwapsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Prime Loan Swaps [Member] | Maximum [Member]    
Derivatives, Fair Value [Line Items]    
Fixed rate 5.20%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ubsh_PrimeLoanSwapsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
FHLB Advance Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 140,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ubsh_FhlbAdvanceSwapsMember
 
Number of interest rate swaps 4us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeByNatureAxis
= ubsh_FhlbAdvanceSwapsMember
 
FHLB Advance Swaps [Member] | Minimum [Member]    
Derivatives, Fair Value [Line Items]    
Fixed rate 3.16%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ubsh_FhlbAdvanceSwapsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Derivative term 5 years  
Interest rate swaps agreement, effective date Feb. 23, 2017  
FHLB Advance Swaps [Member] | Maximum [Member]    
Derivatives, Fair Value [Line Items]    
Fixed rate 3.46%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ubsh_FhlbAdvanceSwapsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Derivative term 6 years  
Interest rate swaps agreement, effective date Feb. 23, 2018  
Fair Value Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 38,300,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FairValueHedgingMember
 
Fair value of derivatives 1,200,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FairValueHedgingMember
 
Unrealized loss of fair value of the cash flow hedges (1,300,000)us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FairValueHedgingMember
 
Fixed rate 3.42%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FairValueHedgingMember
 
Derivative term 15 years  
Interest rate spread calculated on the variable rate 1.93%us-gaap_DerivativeHigherRangeOfBasisSpreadOnVariableRate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FairValueHedgingMember
 
Prime Loan Swaps and FHLB Advance Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Market value of securities pledged as collateral for derivative instruments 4,700,000ubsh_MarketValueOfSecuritiesPledgedAsCollateralForDerivativeInstruments
/ us-gaap_DerivativeByNatureAxis
= ubsh_PrimeLoanSwapsAndFhlbAdvanceSwapsMember
 
Interest Rate Lock Commitments [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 80,200,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateLockCommitmentsMember
 
Asset 1,271,000us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateLockCommitmentsMember
513,000us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateLockCommitmentsMember
Best Effort Forward Delivery Commitments [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities 367,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ubsh_BestEffortForwardDeliveryCommitmentsMember