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Loans and Allowance for Loan Losses - Schedule of Analysis of Non-Accruing Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 2,522us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus	$ 4,826us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	347us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	956us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	800us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneToFourFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	1,277us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneToFourFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,135us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	2,314us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	130us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	139us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 110us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	$ 140us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember

X

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524

+ Details

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