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Fair Value of Financial Instruments (Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Investment Securities - available for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	28,391us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = func_InvestmentSecuritiesAvailableForSaleMember
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	(164)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	7,782us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	1,586us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember
Fair Value, Inputs, Level 3 [Member] | Investment Securities - available for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Discounted Cash Flow
Fair Value, Inputs, Level 3 [Member] | Investment Securities - available for sale [Member] | Unobservable Input - Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Input, Unobservable Input Value, Description	Range of Libor+ 5.50% to 10.50%
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Discounted Cash Flow
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] | Unobservable Input - Reuters Third Party Market Quote [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	99.90%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputReutersThirdPartyMarketQuoteMember
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Market Comparable Properties
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Unobservable Input - Marketability Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember	[1]
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Market Comparable Properties
Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Investment Securities - available for sale [Member] | Unobservable Input - Discount Rate [Member] | London Interbank Offered Rate (LIBOR) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	10.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = func_InvestmentSecuritiesAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputDiscountRateMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Unobservable Input - Marketability Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember / us-gaap_RangeAxis = us-gaap_MinimumMember	[1]
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Investment Securities - available for sale [Member] | Unobservable Input - Discount Rate [Member] | London Interbank Offered Rate (LIBOR) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	5.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = func_InvestmentSecuritiesAvailableForSaleMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputDiscountRateMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Unobservable Input - Marketability Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	15.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember / us-gaap_RangeAxis = us-gaap_MaximumMember	[1]
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Unobservable Input - Marketability Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	15.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember / us-gaap_RangeAxis = us-gaap_MaximumMember	[1]
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] | Unobservable Input - Reuters Third Party Market Quote [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	99.90%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputReutersThirdPartyMarketQuoteMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Unobservable Input - Marketability Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	12.70%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Unobservable Input - Marketability Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate	14.20%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
[1] Range would include discounts taken since appraisal and estimated values

X

- Definition

Fair Value Input, Unobservable Input Value, Description

+ References

No definition available.

+ Details

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X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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X

- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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