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Investment in Limited Partnerships - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Consolidated VIE limited partnership interest	99.90%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Assets representing the carrying amount of remaining partnership		$ 800,000us-gaap_AssetsUnderManagementCarryingAmount
Residual interest upon dissolution of the partnership	1,000,000us-gaap_ProceedsFromLimitedPartnershipInvestments
Reduction of carrying amount of partnership	0usbi_CarryingAmountOfVariableInterestAsDebtEquityAndPartnershipInterest
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Total assets recorded due to consolidation	$ 100,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 100,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Carrying Amount Of Variable Interest As Debt Equity And Partnership Interest

+ References

No definition available.

+ Details

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

X

- Definition

The carrying amount of assets an investment adviser manages on behalf of investors.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsUnderManagementCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cash inflow received as distributions, returns of capital, or sale proceeds from partnership interests held for investment purposes.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromLimitedPartnershipInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: