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Loans and Allowance for Loan Losses - Schedule of Carrying Amount of Loans by Credit Quality Indicator (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Ending balance	$ 274,317us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 315,433us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	52,104us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember	61,599us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	69,021us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember	58,824us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember
Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	10,431us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember	11,348us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
Secured by Multi-family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	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, Recorded Investment [Line Items]
Ending balance	104,883us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember	122,430us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherSegmentMember	761us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherSegmentMember
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	16,838us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember	37,772us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember
Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	579us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember	604us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember
ALC [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	83,142us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	75,559us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	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, Recorded Investment [Line Items]
Ending balance	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
FUSB [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	191,175us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	239,874us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	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] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	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] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	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 Multi-family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	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, Recorded Investment [Line Items]
Ending balance	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, Recorded Investment [Line Items]
Ending balance	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, Recorded Investment [Line Items]
Ending balance	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] | Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	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
Performing [Member] | ALC [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	81,237us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	73,705us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Performing [Member] | ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	20,778us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	26,061us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Performing [Member] | ALC [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	60,459us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	47,644us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Nonperforming [Member] | ALC [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	1,905us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	1,854us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Nonperforming [Member] | ALC [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	531us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	560us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Nonperforming [Member] | ALC [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	1,374us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	1,294us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Pass 1-5 [Member] | FUSB [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	160,421us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	192,281us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Pass 1-5 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	27,956us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	30,459us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Pass 1-5 [Member] | FUSB [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	6,744us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	9,235us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Pass 1-5 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	5,326us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	4,785us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Pass 1-5 [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	18,033us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	14,569us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Pass 1-5 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	86,812us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	101,468us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Pass 1-5 [Member] | FUSB [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	58us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	761us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Pass 1-5 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	14,915us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	30,403us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Pass 1-5 [Member] | FUSB [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	577us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	601us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Special Mention 6 [Member] | FUSB [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	15,385us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	4,588us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Special Mention 6 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	638us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	333us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Special Mention 6 [Member] | FUSB [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	105us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	3us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Special Mention 6 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	2,515us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Special Mention 6 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	10,905us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	3,316us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Special Mention 6 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	1,222us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	936us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Substandard 7 [Member] | FUSB [Member]
Financing Receivable, Recorded Investment [Line Items]
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Substandard 7 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
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Substandard 7 [Member] | FUSB [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
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Substandard 7 [Member] | FUSB [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
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Substandard 7 [Member] | FUSB [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	2,370us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	7,526us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Substandard 7 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
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Substandard 7 [Member] | FUSB [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	701us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	6,433us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Substandard 7 [Member] | FUSB [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance	2us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	3us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_OtherLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Doubtful 8 [Member] | FUSB [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance		75us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Doubtful 8 [Member] | FUSB [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Ending balance		24us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Doubtful 8 [Member] | FUSB [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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