Annual report pursuant to Section 13 and 15(d)

PARENT COMPANY FINANCIAL INFORMATION (Narrative) (Details)

v2.4.1.9
PARENT COMPANY FINANCIAL INFORMATION (Narrative) (Details) (Parent Company [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Parent Company [Member]
 
Aggregate amount of unrestricted funds transferred $ 7.4ubsh_AggregateAmountOfUnrestrictedFundsTransferredFromBank
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Aggregate percentage of unrestricted funds transferred 0.75%ubsh_PercentageOfConsolidatedNetAssetsToDetermineAggregateAmountOfUnrestrictedFunds
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember