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Loans and Allowance for Loan Losses - Schedule of Loan Portfolio by Reporting Segment and Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans $ 253,015us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 274,317us-gaap_LoansAndLeasesReceivableGrossCarryingAmount    
Less: Unearned interest, fees and deferred cost 8,396us-gaap_LoansAndLeasesReceivableDeferredIncome 8,633us-gaap_LoansAndLeasesReceivableDeferredIncome    
Allowance for loan losses 5,401us-gaap_LoansAndLeasesReceivableAllowance 6,168us-gaap_LoansAndLeasesReceivableAllowance    
Net loans 239,218us-gaap_LoansAndLeasesReceivableNetReportedAmount 259,516us-gaap_LoansAndLeasesReceivableNetReportedAmount 276,717us-gaap_LoansAndLeasesReceivableNetReportedAmount  
FUSB [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 171,485us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
191,175us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
   
Less: Unearned interest, fees and deferred cost 174us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
189us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
   
Allowance for loan losses 2,880us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
3,486us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
  6,272us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Net loans 168,431us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
187,500us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
   
ALC [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 81,530us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
83,142us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
   
Less: Unearned interest, fees and deferred cost 8,222us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
8,444us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
   
Allowance for loan losses 2,521us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
2,682us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
  3,124us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Net loans 70,787us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
72,016us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
   
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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, Allowance for Credit Losses [Line Items]        
Total loans 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] | Secured by 1-4 Family Residential Properties [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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, Allowance for Credit Losses [Line Items]        
Total loans 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] | ALC [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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 Multi-family Residential Properties [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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, Allowance for Credit Losses [Line Items]        
Total loans 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 Non-farm, Non-residential Properties [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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, Allowance for Credit Losses [Line Items]        
Total loans 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] | Other Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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, Allowance for Credit Losses [Line Items]        
Total loans 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
   
Commercial and Industrial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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, Allowance for Credit Losses [Line Items]        
Total loans 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
   
Allowance for loan losses 161us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
141us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
  592us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Consumer Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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, Allowance for Credit Losses [Line Items]        
Total loans 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
   
Allowance for loan losses 66us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
114us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
  180us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember
Consumer Loans [Member] | ALC [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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
   
Allowance for loan losses 2,203us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
2,336us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
  2,667us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Other Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans 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, Allowance for Credit Losses [Line Items]        
Total loans 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
   
Allowance for loan losses       $ 13us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_FirstUnitedSecurityBankMember