Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION (Narrative) (Details)

v2.4.1.9
STOCK-BASED COMPENSATION (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 21, 2015
Defined Benefit Plan Disclosure [Line Items]      
Recognized stock-based compensation expense $ 390,000us-gaap_AllocatedShareBasedCompensationExpense $ 374,000us-gaap_AllocatedShareBasedCompensationExpense  
Recognized stock-based compensation expense, net of tax $ 281,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ 270,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax  
Sharebased compensation allocated expense per common share $ 0.01ubsh_ShareBasedCompensationAllocatedExpensePerShare $ 0.01ubsh_ShareBasedCompensationAllocatedExpensePerShare  
Restricted stock vesting percentage 50.00%ubsh_RestrictedStockVestingPercentage    
Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Vesting period 3 years    
Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Vesting period 5 years    
2011 Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Maximum number of shares of the Company's common stock issuable under the plan 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ubsh_TwoThousandAndElevenPlanMember 		   
2011 Plan [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Stock options term from the grant date, maximum 10 years    
Amended and Restated Stock and Incentive Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Maximum number of shares of the Company's common stock issuable under the plan     2,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ubsh_AmendedAndRestatedStockAndIncentivePlanMember