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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	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 274,317us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 315,433us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Less: Unearned interest, fees and deferred cost	8,633us-gaap_LoansAndLeasesReceivableDeferredIncome	5,110us-gaap_LoansAndLeasesReceivableDeferredIncome
Allowance for loan losses	6,168us-gaap_LoansAndLeasesReceivableAllowance	9,396us-gaap_LoansAndLeasesReceivableAllowance
Net loans	259,516us-gaap_LoansAndLeasesReceivableNetReportedAmount	300,927us-gaap_LoansAndLeasesReceivableNetReportedAmount
Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	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, Allowance for Credit Losses [Line Items]
Total loans	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, Allowance for Credit Losses [Line Items]
Total loans	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, Allowance for Credit Losses [Line Items]
Total loans	104,883us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember	122,430us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherSegmentMember	761us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherSegmentMember
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	16,838us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember	37,772us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	69,021us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember	58,824us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember
Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	579us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember	604us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember
FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	191,175us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	239,874us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Less: Unearned interest, fees and deferred cost	189us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	149us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Allowance for loan losses	3,486us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	6,272us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	15,765us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Net loans	187,500us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	233,453us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	10,431us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	11,348us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	30,795us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	34,978us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	20,403us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	22,095us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	104,883us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	122,430us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherSegmentMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	761us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherSegmentMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	16,838us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	37,772us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	7,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	9,886us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	579us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	604us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Allowance for loan losses		13us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	66us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
ALC [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	83,142us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	75,559us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Less: Unearned interest, fees and deferred cost	8,444us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	4,961us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Allowance for loan losses	2,682us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	3,124us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	3,513us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Net loans	72,016us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	67,474us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	21,309us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	26,621us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
ALC [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 61,833us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	$ 48,938us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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