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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
State and local income tax expense (benefit), continuing operations	$ 0.5us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	$ 0.8us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Internal Revenue Service (IRS) [Member]
Operating loss carryforwards	12.0us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
Deferred tax assets, operating loss carryforwards, domestic	4.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
Federal and West Virginia [Member]
Operating loss carryforwards, expiration date	Dec. 31, 2030
West Virginia [Member]
Operating loss carryforwards	5.3us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = func_WestVirginiaMember
Deferred tax assets, operating loss carryforwards, state and local	0.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = func_WestVirginiaMember
Maryland [Member]
Operating loss carryforwards	34.0us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = func_MarylandMember
Deferred tax assets, operating loss carryforwards, state and local	1.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = func_MarylandMember
Valuation allowance, deferred tax asset, change in amount	$ 0.1us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_IncomeTaxAuthorityAxis = func_MarylandMember

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

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Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations.

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