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Other Real Estate Owned - Summary of Foreclosed Property Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 9,310us-gaap_RealEstateAcquiredThroughForeclosure	$ 13,286us-gaap_RealEstateAcquiredThroughForeclosure
Transfers from loans	4,897us-gaap_TransferToOtherRealEstate	2,396us-gaap_TransferToOtherRealEstate
Sales proceeds	(5,870)us-gaap_ProceedsFromSaleOfOtherRealEstate	(4,020)us-gaap_ProceedsFromSaleOfOtherRealEstate
Gross gains	391usbi_OtherRealEstateGrossGains	96usbi_OtherRealEstateGrossGains
Gross losses	(671)usbi_OtherRealEstateGrossLosses	(944)usbi_OtherRealEstateGrossLosses
Net gains (losses)	(280)usbi_OtherRealEstateNetIncomeLoss	(848)usbi_OtherRealEstateNetIncomeLoss
Impairment	(322)us-gaap_ImpairmentOfRealEstate	(1,504)us-gaap_ImpairmentOfRealEstate
Ending Balance	7,735us-gaap_RealEstateAcquiredThroughForeclosure	9,310us-gaap_RealEstateAcquiredThroughForeclosure
FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	8,463us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	11,089us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Transfers from loans	4,503us-gaap_TransferToOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	1,859us-gaap_TransferToOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Sales proceeds	(5,582)us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	(3,051)us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Gross gains	387usbi_OtherRealEstateGrossGains / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	69usbi_OtherRealEstateGrossGains / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Gross losses	(512)usbi_OtherRealEstateGrossLosses / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	(215)usbi_OtherRealEstateGrossLosses / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Net gains (losses)	(125)usbi_OtherRealEstateNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	(146)usbi_OtherRealEstateNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Impairment	(262)us-gaap_ImpairmentOfRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	(1,288)us-gaap_ImpairmentOfRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Ending Balance	6,997us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	8,463us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
ALC [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	847us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	2,197us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Transfers from loans	394us-gaap_TransferToOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	537us-gaap_TransferToOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Sales proceeds	(288)us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	(969)us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Gross gains	4usbi_OtherRealEstateGrossGains / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	27usbi_OtherRealEstateGrossGains / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Gross losses	(159)usbi_OtherRealEstateGrossLosses / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	(729)usbi_OtherRealEstateGrossLosses / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Net gains (losses)	(155)usbi_OtherRealEstateNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	(702)usbi_OtherRealEstateNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Impairment	(60)us-gaap_ImpairmentOfRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	(216)us-gaap_ImpairmentOfRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Ending Balance	$ 738us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	$ 847us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember

X

- Definition

Other real estate gross gains.

+ References

No definition available.

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X

- Definition

Other real estate gross losses.

+ References

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- Definition

Other real estate net income loss.

+ References

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X

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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X

- Definition

The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

+ References

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

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Glossary Investing Activities

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- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

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-Publisher FASB

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- Definition

Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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