Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS (Summary of Acquisition-Related Expenses) (Details)

v2.4.1.9
ACQUISITIONS (Summary of Acquisition-Related Expenses) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Combination, Separately Recognized Transactions [Line Items]      
Salaries and employee benefits $ 107,804us-gaap_LaborAndRelatedExpense $ 70,369us-gaap_LaborAndRelatedExpense $ 68,648us-gaap_LaborAndRelatedExpense
Professional services 5,594us-gaap_ProfessionalFees 3,419us-gaap_ProfessionalFees 3,035us-gaap_ProfessionalFees
Total 20,345ubsh_AcquisitionAndConversionCosts 2,132ubsh_AcquisitionAndConversionCosts  
StellarOne Bank [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Salaries and employee benefits 7,875us-gaap_LaborAndRelatedExpense
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
   
Professional services 3,736us-gaap_ProfessionalFees
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
2,132us-gaap_ProfessionalFees
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
 
Other costs of operations 8,734us-gaap_OtherExpenses
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
   
Total $ 20,345ubsh_AcquisitionAndConversionCosts
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
$ 2,132ubsh_AcquisitionAndConversionCosts
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember