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Income Taxes - Effects of Temporary Differences of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Allowance for loan losses $ 2,276us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses $ 3,556us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Deferred compensation 1,586us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 1,608us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Deferred commissions and fees 181us-gaap_DeferredTaxAssetsTaxDeferredExpense 269us-gaap_DeferredTaxAssetsTaxDeferredExpense
Impairment OREO 1,199us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 3,103us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Federal net operating loss carryforwards 3,360us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 2,135us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
State net operating loss carryforwards 230us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 568us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Federal alternative minimum tax & general business credits carryforwards 231us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 216us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Other 464us-gaap_DeferredTaxAssetsOther 212us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets 9,527us-gaap_DeferredTaxAssetsNet 11,667us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Premises and equipment 490us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 236us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Limited partnerships   154usbi_DeferredTaxLiabilitiesPartnerships
Unrealized gain on securities available-for-sale 1,098usbi_DeferredTaxAssetsUnrealizedGainsOnAvailableForSaleSecuritiesGross 317usbi_DeferredTaxAssetsUnrealizedGainsOnAvailableForSaleSecuritiesGross
Other   173us-gaap_DeferredTaxLiabilitiesOther
Total gross deferred tax liabilities 1,588us-gaap_DeferredIncomeTaxLiabilities 880us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset, included in other assets $ 7,939us-gaap_DeferredTaxAssetsLiabilitiesNet $ 10,787us-gaap_DeferredTaxAssetsLiabilitiesNet