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Loans and Allowance for Loan Losses - Schedule of Average Net Investment Impaired Loans and Interest Income Recognized and Received on Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable Impaired [Line Items]
Average Recorded Investment	$ 9,989us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	$ 14,743us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Interest Income Recognized	163us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod	552us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Interest Income Received	148us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod	540us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
Average Recorded Investment	1,637us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	2,769us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Interest Income Recognized	12us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	46us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Interest Income Received	15us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	46us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_ConstructionLandDevelopmentAndOtherLandLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Average Recorded Investment	96us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneToFourFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	143us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneToFourFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Interest Income Recognized		3us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneToFourFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Interest Income Received		3us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByOneToFourFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Average Recorded Investment	2,458us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	3,565us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Interest Income Recognized	88us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	178us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Interest Income Received	83us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	170us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByMultiFamilyResidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable Impaired [Line Items]
Average Recorded Investment	5,798us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	8,186us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Interest Income Recognized	63us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	324us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Interest Income Received	50us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember	320us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = usbi_SecuredByNonfarmNonresidentialPropertiesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = usbi_RealEstatePortfolioSegmentMember
Commercial and Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Average Recorded Investment		80us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Interest Income Recognized		1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Interest Income Received		$ 1us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524



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-Section 50

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(2)

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(3)

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