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Fair Value of Financial Instruments (Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate | 14.15%us-gaap_FairValueInputsDiscountRate |  |  |
Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Recurring | 25,339 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_CollateralizedDebtObligationsMember |  |  |
Significant Unoservable Inputs | Discount Rate |  |  |
Valuation Technique | Discounted Cash Flow |  |  |
Collateralized Debt Obligations [Member] | Unobservable Input - Discount Rate [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Recurring |  |  | 17,538 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_CollateralizedDebtObligationsMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputDiscountRateMember |
Fair Value Inputs, Discount Rate |  |  | 17.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_CollateralizedDebtObligationsMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputDiscountRateMember |
Interest Rate Swap [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Recurring | (199)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember |  |  |
Significant Unoservable Inputs | Reuters Third Party Market Quote |  |  |
Valuation Technique | Discounted Cash Flow |  |  |
Fair Value Inputs, Comparability Adjustments | 99.90%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember |  |  |
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] |  |  |  |
Assets, Fair Value Disclosure, Recurring |  |  | (457)us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputReutersThirdPartyMarketQuoteMember |
Fair Value Inputs, Comparability Adjustments |  |  | 99.90%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputReutersThirdPartyMarketQuoteMember |
Impaired Loans [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | 9,122 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember |  | 8,613 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember |
Significant Unoservable Inputs | Marketability Discount |  |  |
Valuation Technique | Market Comparable Properties |  |  |
Fair Value Inputs, Comparability Adjustments | 10.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember | [1] |  |
Impaired Loans [Member] | Unobservable Input - Marketability Discount [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  | 8,613 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember |
Fair Value Inputs, Comparability Adjustments |  |  | 10.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember | [1]
Other Real Estate Owned [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | 2,511 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember |  | 5,591 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember |
Significant Unoservable Inputs | Marketability Discount |  |  |
Valuation Technique | Market Comparable Properties |  |  |
Other Real Estate Owned [Member] | Unobservable Input - Marketability Discount [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  |  | 5,591 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | 9,122 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 8,613 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | 2,511 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | $ 5,591 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Minimum [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate | 5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_CollateralizedDebtObligationsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Minimum [Member] | Collateralized Debt Obligations [Member] | Unobservable Input - Discount Rate [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  |  | 6.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_CollateralizedDebtObligationsMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputDiscountRateMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Minimum [Member] | Other Real Estate Owned [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 10.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] |  |
Minimum [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, Comparability Adjustments |  |  | 5.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [1]
Maximum [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate | 12.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_CollateralizedDebtObligationsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Maximum [Member] | Collateralized Debt Obligations [Member] | Unobservable Input - Discount Rate [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  |  | 18.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_CollateralizedDebtObligationsMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputDiscountRateMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Maximum [Member] | Other Real Estate Owned [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 15.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] |  |
Maximum [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, Comparability Adjustments |  |  | 10.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [1]
Weighted Average [Member] | Interest Rate Swap [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 99.90%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |  |
Weighted Average [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, Comparability Adjustments |  |  | 99.90%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputReutersThirdPartyMarketQuoteMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |
Weighted Average [Member] | Impaired Loans [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 10.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |  |
Weighted Average [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, Comparability Adjustments |  |  | 10.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_ImpairedLoansMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |
Weighted Average [Member] | Other Real Estate Owned [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Comparability Adjustments | 11.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |  |
Weighted Average [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, Comparability Adjustments |  |  | 9.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = func_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementBasisAxis = func_UnobservableInputMarketabilityDiscountMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |
[1] | Range would include discounts taken since appraisal and estimated values

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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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
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Definition Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input 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=25499696&loc=d3e19207-110258 + Details
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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=25499696&loc=d3e19207-110258 + Details
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- Definition Description of significant assumptions used by management to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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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=25499696&loc=d3e19207-110258 + Details
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