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SEGMENT REPORTING DISCLOSURES (Narrative) (Details)
12 Months Ended
Dec. 31, 2014
entity
segment
item
Segment Reporting Information [Line Items]  
Number of reportable segments 2us-gaap_NumberOfReportableSegments
Number of retail locations 131us-gaap_NumberOfStores
Number of subsidiary bank 1ubsh_NumberOfSubsidiaryIncludedProvidingServicesToRetailAndCommercialCustomers
Mortgage banking segment interest - floor 0.00%ubsh_DebtFloorInterestRate
Warehouse Line of Credit [Member] | LIBOR [Member]  
Segment Reporting Information [Line Items]  
Spread to 3-Month LIBOR 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ubsh_WarehouseLineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember