Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Summary of Quantitative Information About Level 3 Fair Value Measurements) (Details)

v2.4.1.9
FAIR VALUE MEASUREMENTS (Summary of Quantitative Information About Level 3 Fair Value Measurements) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Market comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Total 38,055us-gaap_AssetsFairValueDisclosure
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember 		43,915us-gaap_AssetsFairValueDisclosure
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember
Other Real Estate Owned [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unobservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Other Real Estate Owned [Member] | Market comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Other real estate owned 25,434ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisOreoAssetValue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_OtherRealEstateOwnedMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember 		28,118ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisOreoAssetValue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_OtherRealEstateOwnedMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember
Discount applied to market comparables [Member] | Other Real Estate Owned [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted Average 31.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_OtherRealEstateOwnedMember 		32.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_OtherRealEstateOwnedMember
Impaired loans [Member] | Market comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Total Impaired Loans 12,621ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember 		15,797ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember
Impaired loans [Member] | Commercial Real Estate - Owner Occupied [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unobservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Impaired loans [Member] | Commercial Real Estate - Owner Occupied [Member] | Market comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Total Impaired Loans 4,524ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember 		3,304ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateOwnerOccupiedMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember
Impaired loans [Member] | Commercial Real Estate - Non-Owner Occupied [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unobservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Impaired loans [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Market comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Total Impaired Loans 3,860ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateNonOwnerOccupiedMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember 		7,828ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateNonOwnerOccupiedMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember
Impaired loans [Member] | Raw Land and Lots [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unobservable inputs   Discount applied to market comparables (1) [1]
Impaired loans [Member] | Raw Land and Lots [Member] | Market comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Total Impaired Loans   431ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_RawLandAndLotsMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember
Impaired loans [Member] | Single Family Investment Real Estate [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unobservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Impaired loans [Member] | Single Family Investment Real Estate [Member] | Market comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Total Impaired Loans 1,220ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_SingleFamilyInvestmentRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember 		1,366ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_SingleFamilyInvestmentRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember
Impaired loans [Member] | Commercial and Industrial [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unobservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Impaired loans [Member] | Commercial and Industrial [Member] | Market comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Total Impaired Loans 2,011ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialAndIndustrialMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember 		339ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialAndIndustrialMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember
Impaired loans [Member] | Other Consumer [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unobservable inputs Discount applied to market comparables (1) [1],[2] Discount applied to market comparables (1) [1],[2]
Impaired loans [Member] | Other Consumer [Member] | Market comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Total Impaired Loans 1,006ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember 		[2] 2,529ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_ValuationTechniqueAxis
= ubsh_MarketComparablesMember 		[2]
Impaired loans [Member] | Discount applied to market comparables [Member] | Commercial Real Estate - Owner Occupied [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted Average 37.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateOwnerOccupiedMember 		34.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateOwnerOccupiedMember
Impaired loans [Member] | Discount applied to market comparables [Member] | Commercial Real Estate - Non-Owner Occupied [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted Average 0.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateNonOwnerOccupiedMember 		1.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateNonOwnerOccupiedMember
Impaired loans [Member] | Discount applied to market comparables [Member] | Raw Land and Lots [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted Average   16.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_RawLandAndLotsMember
Impaired loans [Member] | Discount applied to market comparables [Member] | Single Family Investment Real Estate [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted Average 5.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_SingleFamilyInvestmentRealEstateMember 		14.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_SingleFamilyInvestmentRealEstateMember
Impaired loans [Member] | Discount applied to market comparables [Member] | Commercial and Industrial [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted Average 11.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialAndIndustrialMember 		45.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialAndIndustrialMember
Impaired loans [Member] | Discount applied to market comparables [Member] | Other Consumer [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted Average 5.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember 		[2] 6.00%ubsh_FairValueMeasurementsWeightedAverage
/ ubsh_FairValueByLevel3UnobservableInputTypesAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancialInstrumentAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember 		[2]
[1] A discount percentage (in addition to expected selling costs) is applied based on the age of independent appraisals, current market conditions, and experience within the local market.
[2] The “Other” category of the impaired loans section consists of Other Commercial, Mortgage, Consumer Construction, Indirect Marine, HELOCs, and Other Consumer.