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Loans and Allowance for Loan Losses - Schedule of Carrying Amount of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Carrying Amount	$ 274,317us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 315,433us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	10,431us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember	11,348us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	52,104us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember	61,599us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember
Secured by Multi-family Residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	20,403us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember	22,095us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember
Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	104,883us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember	122,430us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember
Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	16,838us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember	37,772us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember
Impaired Loans with No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	8,387us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	18,124us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Unpaid Principal Balance	8,778us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	18,124us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Impaired Loans with No Related Allowance Recorded [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	1,445us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	4,590us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Unpaid Principal Balance	1,445us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	4,590us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Impaired Loans with No Related Allowance Recorded [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	96us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	103us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Unpaid Principal Balance	96us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	103us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Impaired Loans with No Related Allowance Recorded [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	755us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	1,053us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Unpaid Principal Balance	1,146us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	1,053us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Impaired Loans with No Related Allowance Recorded [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	6,091us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	11,844us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Unpaid Principal Balance	6,091us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember	11,844us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Impaired Loans with No Related Allowance Recorded [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount		534us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Unpaid Principal Balance		534us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithNoRelatedAllowanceRecordedMember
Impaired Loans with an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	2,218us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember	14,661us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Unpaid Principal Balance	2,218us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember	14,661us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Related Allowances	762us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember	3,302us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Impaired Loans with an Allowance Recorded [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	603us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember	1,407us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Unpaid Principal Balance	603us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember	1,407us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Related Allowances	71us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember	232us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Impaired Loans with an Allowance Recorded [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount		185us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Unpaid Principal Balance		185us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Related Allowances		11us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Impaired Loans with an Allowance Recorded [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	1,615us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember	6,474us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Unpaid Principal Balance	1,615us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember	6,474us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Related Allowances	691us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember	2,005us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Impaired Loans with an Allowance Recorded [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount		6,376us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Unpaid Principal Balance		6,376us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Related Allowances		835us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Impaired Loans with an Allowance Recorded [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount		219us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Unpaid Principal Balance		219us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Related Allowances		219us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansWithAllowanceRecordedMember
Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	10,605us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	32,785us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Unpaid Principal Balance	10,996us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	32,785us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Related Allowances	762us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	3,302us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Impaired Loans [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	2,048us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	5,997us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Unpaid Principal Balance	2,048us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	5,997us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Related Allowances	71us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	232us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Impaired Loans [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	96us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	288us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Unpaid Principal Balance	96us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	288us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Related Allowances		11us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Impaired Loans [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	2,370us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	7,527us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Unpaid Principal Balance	2,761us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	7,527us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Related Allowances	691us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	2,005us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Impaired Loans [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount	6,091us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	18,220us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Unpaid Principal Balance	6,091us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember	18,220us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Related Allowances		835us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Impaired Loans [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Carrying Amount		753us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Unpaid Principal Balance		753us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember
Related Allowances		$ 219us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_ConcentrationRiskByTypeAxis = usbi_ImpairedLoansMember

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

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