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Note 7 - Other Real Estate Owned (Details Textual) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
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Foreclosed Real Estate Owned, Fair Value Less Disposal Costs | $ 1.2 |  | $ 1.1
Mortgage Loans in Process of Foreclosure, Amount | $ 0.3 | $ 0.2 |

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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL49126937-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 + Details
Name: | us-gaap_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The fair value less estimated costs to sell of foreclosed residential real estate held by the Company as of the balance sheet date. + References No definition available. + Details
Name: | usbi_ForeclosedRealEstateOwnedFairValueLessDisposalCosts
Namespace Prefix: | usbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant