XML 13 R54.htm IDEA: XBRL DOCUMENT
v2.4.0.8

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

X
- 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

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