Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Other Real Estate Owned [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unoberservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Discount Applied to Market Comparables [Member] | Other Real Estate Owned [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted average 32.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_OtherRealEstateOwnedMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember 		33.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_OtherRealEstateOwnedMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
Market Comparables [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Total 43,915us-gaap_AssetsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember 		42,101us-gaap_AssetsFairValueDisclosure
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Impaired loans 15,797ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember 		7,985ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
Market Comparables [Member] | Other Real Estate Owned [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Other real estate owned 28,118ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisOreoAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_OtherRealEstateOwnedMember 		34,116ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisOreoAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_OtherRealEstateOwnedMember
Commercial Construction [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unoberservable inputs   Discount applied to market comparables (1) [1]
Commercial Construction [Member] | Discount Applied to Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted average   0.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialConstructionMember
Commercial Construction [Member] | Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Impaired loans   219ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialConstructionMember
Commercial Real Estate - Owner Occupied [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unoberservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Commercial Real Estate - Owner Occupied [Member] | Discount Applied to Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted average 34.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateOwnerOccupiedMember 		17.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate - Owner Occupied [Member] | Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Impaired loans 3,304ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateOwnerOccupiedMember 		2,043ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate - Non-Owner Occupied [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unoberservable inputs Discount applied to market comparables (1) [1]  
Commercial Real Estate - Non-Owner Occupied [Member] | Discount Applied to Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted average 1.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateNonOwnerOccupiedMember 		 
Commercial Real Estate - Non-Owner Occupied [Member] | Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Impaired loans 7,828ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialRealEstateNonOwnerOccupiedMember 		 
Raw Land and Lots [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unoberservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Raw Land and Lots [Member] | Discount Applied to Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted average 16.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_RawLandAndLotsMember 		10.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_RawLandAndLotsMember
Raw Land and Lots [Member] | Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Impaired loans 431ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_RawLandAndLotsMember 		908ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_RawLandAndLotsMember
Single Family Investment Real Estate [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unoberservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Single Family Investment Real Estate [Member] | Discount Applied to Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted average 14.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_SingleFamilyInvestmentRealEstateMember 		0.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_SingleFamilyInvestmentRealEstateMember
Single Family Investment Real Estate [Member] | Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Impaired loans 1,366ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_SingleFamilyInvestmentRealEstateMember 		1,332ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_SingleFamilyInvestmentRealEstateMember
Commercial and Industrial [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unoberservable inputs Discount applied to market comparables (1) [1] Discount applied to market comparables (1) [1]
Commercial and Industrial [Member] | Discount Applied to Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted average 45.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialAndIndustrialMember 		28.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialAndIndustrialMember
Commercial and Industrial [Member] | Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Impaired loans 339ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialAndIndustrialMember 		1,719ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ubsh_CommercialAndIndustrialMember
Other Consumer [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Level 3 fair value unoberservable inputs Discount applied to market comparables (1) [1],[2] Discount applied to market comparables (1) [1]
Other Consumer [Member] | Discount Applied to Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Weighted average 6.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember 		[2] 0.00%ubsh_FairValueMeasurementsWeightedAverage
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FairValueEstimateNotPracticableDisclosureItemsAxis
= ubsh_DiscountAppliedToMarketComparablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
Other Consumer [Member] | Market Comparables [Member] | Impaired Loans [Member]    
Summary of quantitative information about Level 3 Fair Value Measurements    
Impaired loans 2,529ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember 		[2] 1,764ubsh_FairValueMeasurementWithUnobservableInputsNonrecurringBasisImpairedLoansAssetValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= ubsh_MarketComparablesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= ubsh_ImpairedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
[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.