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Other Real Estate Owned - Summary of Foreclosed Property Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 7,735us-gaap_RealEstateAcquiredThroughForeclosure	$ 9,310us-gaap_RealEstateAcquiredThroughForeclosure
Transfers from loans	1,058us-gaap_TransferToOtherRealEstate	2,320us-gaap_TransferToOtherRealEstate
Sales proceeds	(106)us-gaap_ProceedsFromSaleOfOtherRealEstate	(1,280)us-gaap_ProceedsFromSaleOfOtherRealEstate
Gross gains		147usbi_OtherRealEstateGrossGains
Gross losses	(49)usbi_OtherRealEstateGrossLosses	(59)usbi_OtherRealEstateGrossLosses
Net gains (losses)	(49)usbi_OtherRealEstateNetIncomeLoss	88usbi_OtherRealEstateNetIncomeLoss
Impairment	(30)us-gaap_ImpairmentOfRealEstate	(54)us-gaap_ImpairmentOfRealEstate
Ending Balance	8,608us-gaap_RealEstateAcquiredThroughForeclosure	10,384us-gaap_RealEstateAcquiredThroughForeclosure
FUSB [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	6,997us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	8,463us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Transfers from loans	995us-gaap_TransferToOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	2,154us-gaap_TransferToOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Sales proceeds	(40)us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	(1,239)us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Gross gains		147usbi_OtherRealEstateGrossGains / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Gross losses	(3)usbi_OtherRealEstateGrossLosses / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	(33)usbi_OtherRealEstateGrossLosses / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Net gains (losses)	(3)usbi_OtherRealEstateNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	114usbi_OtherRealEstateNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Impairment		(10)us-gaap_ImpairmentOfRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
Ending Balance	7,949us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember	9,482us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_FirstUnitedSecurityBankMember
ALC [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	738us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	847us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Transfers from loans	63us-gaap_TransferToOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	166us-gaap_TransferToOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Sales proceeds	(66)us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	(41)us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Gross losses	(46)usbi_OtherRealEstateGrossLosses / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	(26)usbi_OtherRealEstateGrossLosses / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Net gains (losses)	(46)usbi_OtherRealEstateNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	(26)usbi_OtherRealEstateNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Impairment	(30)us-gaap_ImpairmentOfRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	(44)us-gaap_ImpairmentOfRealEstate / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember
Ending Balance	$ 659us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember	$ 902us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_StatementBusinessSegmentsAxis = usbi_AcceptanceLoanCompanyMember

X

- Definition

Other real estate gross gains.

+ References

No definition available.

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Balance Type:	credit
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X

- Definition

Other real estate gross losses.

+ References

No definition available.

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- Definition

Other real estate net income loss.

+ References

No definition available.

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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

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

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-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

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

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