Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFITS AND SHARE BASED COMPENSATION (Schedule of Recognized Stock-Based Compensation Expense) (Details)

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EMPLOYEE BENEFITS AND SHARE BASED COMPENSATION (Schedule of Recognized Stock-Based Compensation Expense) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
EMPLOYEE BENEFITS AND SHARE BASED COMPENSATION [Abstract]      
Stock-based compensation expense $ 979us-gaap_AllocatedShareBasedCompensationExpense $ 889us-gaap_AllocatedShareBasedCompensationExpense $ 1,252us-gaap_AllocatedShareBasedCompensationExpense
Reduction of income tax expense $ 234us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 181us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 309us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Per share compensation cost $ 0.02ubsh_SharebasedCompensationAllocatedExpenseOnEarningsPerShare $ 0.04ubsh_SharebasedCompensationAllocatedExpenseOnEarningsPerShare $ 0.05ubsh_SharebasedCompensationAllocatedExpenseOnEarningsPerShare