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Note 15 - Guarantees, Commitments and Contingencies (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Securities Committed to Purchase Amount | $ 2,000,000 |  | $ 0
Credit Losses Associated With Derivative Contracts | 0 | $ 0 |
Securities Committed to Sell Amount | $ 0 |  | $ 0

X
- Definition Credit losses associated with derivative contracts. + References No definition available. + Details
Name: | usbi_CreditLossesAssociatedWithDerivativeContracts
Namespace Prefix: | usbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Securities committed to purchase amount. + References No definition available. + Details
Name: | usbi_SecuritiesCommittedToPurchaseAmount
Namespace Prefix: | usbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Securities committed to sell amount. + References No definition available. + Details
Name: | usbi_SecuritiesCommittedToSellAmount
Namespace Prefix: | usbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant