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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
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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 | 28,391 us-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 | 7,782 us-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 | 1,586 us-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

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- Definition Fair Value Input, Unobservable Input Value, Description + References No definition available. + Details
Name: | func_FairValueInputUnobservableInputValueDescription
Namespace Prefix: | func_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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- 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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 + Details
Name: | us-gaap_FairValueMeasurementsValuationTechniques
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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Period Type: |