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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Income Tax Disclosure [Abstract]                          
Federal statutory income tax rate                 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate        
Net deferred tax assets $ 7,939,000us-gaap_DeferredTaxAssetsLiabilitiesNet       $ 10,787,000us-gaap_DeferredTaxAssetsLiabilitiesNet       $ 7,939,000us-gaap_DeferredTaxAssetsLiabilitiesNet $ 10,787,000us-gaap_DeferredTaxAssetsLiabilitiesNet     $ 10,787,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Federal and state net operating loss and tax credit carryforwards 3,800,000usbi_DeferredTaxAssetsFederalAndStateNetOperatingLossesCarryforward               3,800,000usbi_DeferredTaxAssetsFederalAndStateNetOperatingLossesCarryforward        
Deferred tax assets not subject to expiration 4,100,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration               4,100,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration        
Period of positive earnings                 18 years        
Period of historical earning                 20 years        
Cumulative loss position period                 3 years        
Cumulative continuing operations pre-tax loss position                 8,400,000usbi_CumulativeContinuingOperationsBeforeTaxLoss        
Deferred tax assets related to allowance for loan losses and impairment of OREO 3,500,000usbi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLossesAndImpairmentOfOtherRealEstateOwned       6,700,000usbi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLossesAndImpairmentOfOtherRealEstateOwned       3,500,000usbi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLossesAndImpairmentOfOtherRealEstateOwned 6,700,000usbi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLossesAndImpairmentOfOtherRealEstateOwned     6,700,000usbi_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLossesAndImpairmentOfOtherRealEstateOwned
Gross unrealized pre-tax gains                 3,300,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains 2,400,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains      
Income (loss) before income taxes                 5,378,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 5,436,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest     (2,600,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision (reduction in reserve) for loan losses (169,000)us-gaap_ProvisionForLoanAndLeaseLosses (55,000)us-gaap_ProvisionForLoanAndLeaseLosses (264,000)us-gaap_ProvisionForLoanAndLeaseLosses 414,000us-gaap_ProvisionForLoanAndLeaseLosses (1,441,000)us-gaap_ProvisionForLoanAndLeaseLosses 240,000us-gaap_ProvisionForLoanAndLeaseLosses 53,000us-gaap_ProvisionForLoanAndLeaseLosses 506,000us-gaap_ProvisionForLoanAndLeaseLosses (74,000)us-gaap_ProvisionForLoanAndLeaseLosses (642,000)us-gaap_ProvisionForLoanAndLeaseLosses 4,300,000us-gaap_ProvisionForLoanAndLeaseLosses 18,800,000us-gaap_ProvisionForLoanAndLeaseLosses 22,500,000us-gaap_ProvisionForLoanAndLeaseLosses
Unrecognized tax benefits 0us-gaap_UnrecognizedTaxBenefits               0us-gaap_UnrecognizedTaxBenefits        
Accrued interest and penalties $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued               $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued