XML 69 R49.htm IDEA: XBRL DOCUMENT v3.2.0.727

Short-Term Borrowings - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Federal funds purchased	$ 0	$ 0
Securities sold under repurchase agreements	1,000,000	400,000
Available fund lines from correspondent banks	$ 18,800,000	$ 18,800,000
Minimum [Member]
Short-term Debt [Line Items]
Maturity period of federal funds	1 day
Maximum [Member]
Short-term Debt [Line Items]
Maturity period of federal funds	4 days

X

- Definition

Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.13(1))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_FederalFundsPurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 50



-Paragraph 3



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 235



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.4-08.(m)(1)(a)(i))



-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.13(1))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 55



-Paragraph 10



-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313



Reference 5: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 45



-Paragraph 11



-URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771



Reference 6: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing



-URI http://asc.fasb.org/extlink&oid=49203159

+ Details

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Available fund lines from correspondent banks.

+ References

No definition available.

+ Details

Name:	usbi_AvailableFundLinesFromCorrespondentBanks
Namespace Prefix:	usbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maturity period of federal funds.

+ References

No definition available.

+ Details

Name:	usbi_MaturityPeriodOfFederalFunds
Namespace Prefix:	usbi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: