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Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructuring (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Principal Balance | $ 4,859 | $ 7,666
Change | (2,807) |
Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Principal Balance | 2,827 | 3,837
Change | (1,010) |
Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Principal Balance | 383 | 1,067
Change | (684) |
Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Principal Balance | 1,533 | 2,418
Change | (885) |
Commercial and Industrial Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Post-Modification Principal Balance | 116 | 344
Change | $ (228) |

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- Definition Change in troubled debt increase decrease. + References No definition available. + Details
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Namespace Prefix: | usbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration