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Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
SecurityLoan
Segment
Dec. 31, 2013
Loans
SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of portfolio segments 8usbi_NumberOfPortfolioSegments  
Related party loans and commitments $ 3,100,000us-gaap_LoansAndLeasesReceivableRelatedParties $ 3,600,000us-gaap_LoansAndLeasesReceivableRelatedParties
New loans to parties 0us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions 1,700,000us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Repayments of loan 500,000us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections 600,000us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Loans on which the accrual of interest has been discontinued 4,826,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 10,565,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Accrued interest on loans 100,000usbi_ImpairedFinancingReceivableInterestIncomeAccrual 600,000usbi_ImpairedFinancingReceivableInterestIncomeAccrual
Interest income recorded 200,000usbi_LoansAndLeasesReceivableImpairedTroubledDebtInterest 100,000usbi_LoansAndLeasesReceivableImpairedTroubledDebtInterest
Accruing loans past due 90 days or more amounted 1,700,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 1,700,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Trouble Debt restructuring Modified period term 6 months  
Period of repayment performance under the modified loan terms 6 months  
Non-accruing loans restructured and remained on nonaccrual status 2,500,000usbi_FinancingReceivableRestructuringRecordedInvestmentWithNonaccrualStatus 5,700,000usbi_FinancingReceivableRestructuringRecordedInvestmentWithNonaccrualStatus
Repayments of loans 0usbi_RepaymentOfLoans 2,000,000usbi_RepaymentOfLoans
Number of loans returned to accrual status   1usbi_NumberOfTroubledDebtRestructuringLoansReturnedBackToAccruingStatus
Restructured loans on accrual status 1,400,000usbi_FinancingReceivableRestructuringRecordedInvestmentWithAccrualStatus  
Number of loans modified in troubled debt restructuring 18us-gaap_FinancingReceivableModificationsNumberOfContracts2 40us-gaap_FinancingReceivableModificationsNumberOfContracts2
Troubled debt restructuring evaluated impairment 500,000us-gaap_FinancingReceivableModificationsRecordedInvestment 500,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Allowance for loans losses 900,000us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment 800,000us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment
Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of loan portfolio 68.50%usbi_PercentageOfLoanPortfolio
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 69.20%usbi_PercentageOfLoanPortfolio
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember
ALC [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accruing loans past due 90 days or more amounted 1,736,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		 1,661,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember
Number of loans modified in troubled debt restructuring 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_StatementBusinessSegmentsAxis
= usbi_AcceptanceLoanCompanyMember		  
Minimum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan amount threshold for impairment analysis 500,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Restructured Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled debt restructuring evaluated impairment 0us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= usbi_RestructuredLoansMember		  
Allowance for loans losses $ 0us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= usbi_RestructuredLoansMember