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Other Real Estate Owned - Additional Information (Detail)	6 Months Ended
	Jun. 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