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Loans and Allowance for Loan Losses - Schedule of Analysis of Non-Accruing Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 4,826us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus	$ 10,565us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Construction, Land Development and Other Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	956us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember	2,337us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,277us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember	1,952us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneFourFamilyResidentialPropertiesMember
Secured by Multi-family Residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		1,286us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember
Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,314us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember	4,435us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	139us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember	479us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_CommercialAndIndustrialLoansMember
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 140us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerPortfolioSegmentMember	$ 76us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = 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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