Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION (Estimated Unamortized Compensation Expense Recognized in Future) (Details)

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STOCK-BASED COMPENSATION (Estimated Unamortized Compensation Expense Recognized in Future) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Estimated unamortized compensation expense recognized in future  
For the remainder of the current year $ 1,430ubsh_EstimatedUnamortizedCompensationExpenseYearOne
For year ending December 31, 2016 1,716ubsh_EstimatedUnamortizedCompensationExpenseYearTwo
For year ending December 31, 2017 914ubsh_EstimatedUnamortizedCompensationExpenseYearThree
For year ending December 31, 2018 495ubsh_EstimatedUnamortizedCompensationExpenseYearFour
For year ending December 31, 2019 70ubsh_EstimatedUnamortizedCompensationExpenseYearFive
Total 4,625ubsh_EstimatedUnamortizedCompensationExpense
Stock Options [Member]  
Estimated unamortized compensation expense recognized in future  
For the remainder of the current year 155ubsh_EstimatedUnamortizedCompensationExpenseYearOne
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
For year ending December 31, 2016 130ubsh_EstimatedUnamortizedCompensationExpenseYearTwo
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
For year ending December 31, 2017 15ubsh_EstimatedUnamortizedCompensationExpenseYearThree
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Total 300ubsh_EstimatedUnamortizedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Restricted Stock [Member]  
Estimated unamortized compensation expense recognized in future  
For the remainder of the current year 1,275ubsh_EstimatedUnamortizedCompensationExpenseYearOne
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
For year ending December 31, 2016 1,586ubsh_EstimatedUnamortizedCompensationExpenseYearTwo
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
For year ending December 31, 2017 899ubsh_EstimatedUnamortizedCompensationExpenseYearThree
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
For year ending December 31, 2018 495ubsh_EstimatedUnamortizedCompensationExpenseYearFour
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
For year ending December 31, 2019 70ubsh_EstimatedUnamortizedCompensationExpenseYearFive
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Total $ 4,325ubsh_EstimatedUnamortizedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember