XML 41 R40.htm IDEA: XBRL DOCUMENT v2.4.1.9
Loans and Allowance for Loan Losses - Schedule of Carrying Amount of Loans by Credit Quality Indicator (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Ending balance $ 253,015us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 274,317us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
FUSB [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 171,485us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 191,175us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Pass 1-5 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 151,405us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 160,421us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Special Mention 6 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 8,312us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 15,385us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Substandard 7 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 11,755us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 15,369us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Doubtful 8 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 13us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		  
ALC [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 81,530us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 83,142us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
ALC [Member] | Performing Financing Receivable    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 79,712us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 81,237us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
ALC [Member] | Nonperforming Financing Receivable    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 1,818us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 1,905us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 10,137us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember		 10,431us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | FUSB [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 10,137us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 10,431us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | FUSB [Member] | Pass 1-5 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 5,641us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 5,326us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | FUSB [Member] | Special Mention 6 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,515us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 2,515us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | FUSB [Member] | Substandard 7 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 1,981us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 2,590us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 49,754us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember		 52,104us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | FUSB [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 29,545us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 30,795us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | FUSB [Member] | Pass 1-5 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 28,870us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 27,956us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | FUSB [Member] | Special Mention 6 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance   638us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | FUSB [Member] | Substandard 7 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 662us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 2,201us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | FUSB [Member] | Doubtful 8 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 13us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		  
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | ALC [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 20,209us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 21,309us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | ALC [Member] | Performing Financing Receivable    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 19,652us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 20,778us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | ALC [Member] | Nonperforming Financing Receivable    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 557us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 531us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByOneToFourFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 18,837us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByMultiFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember		 20,403us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByMultiFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | FUSB [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 18,837us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByMultiFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 20,403us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByMultiFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | FUSB [Member] | Pass 1-5 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 16,478us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByMultiFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 18,033us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByMultiFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] | FUSB [Member] | Substandard 7 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 2,359us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByMultiFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 2,370us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByMultiFamilyResidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 86,982us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember		 104,883us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | FUSB [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 86,982us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 104,883us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | FUSB [Member] | Pass 1-5 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 76,457us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 86,812us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | FUSB [Member] | Special Mention 6 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 4,584us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 10,905us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] | FUSB [Member] | Substandard 7 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 5,941us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 7,166us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_SecuredByNonfarmNonresidentialPropertiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Other Real Estate Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_OtherRealEstateLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember		 58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_OtherRealEstateLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Other Real Estate Loans [Member] | FUSB [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_OtherRealEstateLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_OtherRealEstateLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Real Estate [Member] | Other Real Estate Loans [Member] | FUSB [Member] | Pass 1-5 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_OtherRealEstateLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= usbi_OtherRealEstateLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= usbi_RealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 17,897us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 16,838us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial and Industrial Loans [Member] | FUSB [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 17,897us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 16,838us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Commercial and Industrial Loans [Member] | FUSB [Member] | Pass 1-5 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 15,959us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 14,915us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Commercial and Industrial Loans [Member] | FUSB [Member] | Special Mention 6 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 1,213us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 1,222us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Commercial and Industrial Loans [Member] | FUSB [Member] | Substandard 7 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 725us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 701us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Consumer Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 68,575us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 69,021us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Consumer Loans [Member] | FUSB [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 7,254us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 7,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Consumer Loans [Member] | FUSB [Member] | Pass 1-5 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 7,167us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 6,744us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Consumer Loans [Member] | FUSB [Member] | Special Mention 6 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance   105us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Consumer Loans [Member] | FUSB [Member] | Substandard 7 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 87us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 339us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Consumer Loans [Member] | ALC [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 61,321us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 61,833us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Consumer Loans [Member] | ALC [Member] | Performing Financing Receivable    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 60,060us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 60,459us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Consumer Loans [Member] | ALC [Member] | Nonperforming Financing Receivable    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 1,261us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 1,374us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Other Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 775us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember		 579us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember
Other Loans [Member] | FUSB [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 775us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 579us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Other Loans [Member] | FUSB [Member] | Pass 1-5 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance 775us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember		 577us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Other Loans [Member] | FUSB [Member] | Substandard 7 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Ending balance   $ 2us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember