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Note 16 - Guarantees, Commitments and Contingencies (Details Textual) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Securities Committed to Purchase Amount	$ 0		$ 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