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Other Real Estate Owned - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2014
Real Estate [Abstract] |
Maximum period for recording the adjustments to loan losses | 60 days

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- Definition Maximum period for recording the adjustments to loan losses. + References No definition available. + Details
Name: | usbi_MaximumPeriodForRecordingAdjustmentsToLoanLosses
Namespace Prefix: | usbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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