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Other Operating Expenses - Components of Other Operating Expenses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Component Of Other Operation Expense [Line Items]
Total	$ 7,602us-gaap_OtherNoninterestExpense	$ 8,274us-gaap_OtherNoninterestExpense
Legal, Accounting and Other Professional Fees [Member]
Component Of Other Operation Expense [Line Items]
Total	1,217us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_LegalAndProfessionalFeeMember	1,355us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_LegalAndProfessionalFeeMember
Postage, Stationery and Supplies [Member]
Component Of Other Operation Expense [Line Items]
Total	749us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_PostageStationeryAndSuppliesMember	851us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_PostageStationeryAndSuppliesMember
Telephone/Data Communication [Member]
Component Of Other Operation Expense [Line Items]
Total	642us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_TelephoneAndDataCommunicationMember	622us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_TelephoneAndDataCommunicationMember
FDIC Insurance Assessments [Member]
Component Of Other Operation Expense [Line Items]
Total	565us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_FederalDepositInsuranceCorporationInsuranceAssessmentsMember	722us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_FederalDepositInsuranceCorporationInsuranceAssessmentsMember
Other [Member]
Component Of Other Operation Expense [Line Items]
Total	$ 4,429us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_OtherOperatingExpenseOtherMember	$ 4,724us-gaap_OtherNoninterestExpense / us-gaap_IncomeStatementLocationAxis = usbi_OtherOperatingExpenseOtherMember

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- Definition

Other noninterest expenses that are not separately presented in any other noninterest expense category.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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