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Accumulated Other Comprehensive Loss (AOCL) (Components of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax | $ 8,737 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | $ (8,326)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Cash flow hedges: Unrealized holding gains, Before Tax | 258 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | 392 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Cash flow hedges: Unrealized holding gains, Tax Effect | (103)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax | (159)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Cash flow hedges: Unrealized holding gains, Net of Tax | 155 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 233 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Unrealized net actuarial gain (loss), Net of Tax | (6,304)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | 3,174 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Other Comprehensive Income, Before Tax Amount | 6,629 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (3,988)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Other Comprehensive Income, Tax (Expense) Benefit | (2,649)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | 1,598 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other Comprehensive Income, Net | 3,980 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (2,390)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Investment securities- with OTTI AFS [Member] |  |
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before Tax Amount | 7,234 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember | 4,626 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
Available for sale (AFS) securities with OTTI: Unrealized holding gains, tax effect | (2,885)func_OtherThanTemporaryImpairmentLossesInvestmentsAvailableForSaleSecuritiesTaxEffect / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember | (1,891)func_OtherThanTemporaryImpairmentLossesInvestmentsAvailableForSaleSecuritiesTaxEffect / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of Tax | 4,349 func_OtherThanTemporaryImpairmentLossesInvestmentsAvailableForSaleSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember | 2,735 func_OtherThanTemporaryImpairmentLossesInvestmentsAvailableForSaleSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income | 674 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentOfNoncreditPortionIncludedInNetIncomeAvailabeforsaleSecuritiesBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember | 537 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentOfNoncreditPortionIncludedInNetIncomeAvailabeforsaleSecuritiesBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax Effect | (269)func_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentOfNoncreditPortionIncludedInNetIncomeAvailabeForSaleSecuritiesTaxEffect / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember | (215)func_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentOfNoncreditPortionIncludedInNetIncomeAvailabeForSaleSecuritiesTaxEffect / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
Other than Temporary Impairment Losses, Investments, Reclassification Adjustment of Noncredit Portion Included in Net Income, Available for Sale Securities, Net of Tax | 405 func_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentOfNoncreditPortionIncludedInNetIncomeAvailableForSaleSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember | 322 func_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentOfNoncreditPortionIncludedInNetIncomeAvailableForSaleSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before Tax Amount | 6,560 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember | 4,089 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI: Net unrealized gains on investments with OTTI, Tax Effect | (2,616)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember | (1,676)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of Tax | 3,944 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember | 2,413 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
Investment Securities -All Other AFS [Member] |  |
Securities: Unrealized holding losses, Before Tax | 14,501 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember | (13,879)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember
Securities: Unrealized holding losses, Tax Effect | (5,789)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember | 5,600 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember
Securities: Unrealized holding losses, Net of Tax | 8,712 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember | (8,279)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember
Securities: Less: gains recognized in income, Before Tax | (41)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember | 78 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember
Securities: Less: gains recognized in income, Tax Effect | 16 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember | (31)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember
Securities: Less: gains recognized in income, Net of Tax | (25)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember | 47 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Before Tax | 14,542 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember | (13,957)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Tax Effect | (5,805)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember | 5,631 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax | 8,737 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember | (8,326)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossAvailableForSaleMember
Investment Securities HTM [Member] |  |
Securities: Unrealized holding losses, Before Tax | (3,984)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossHeldToMaturityMember |
Securities: Unrealized holding losses, Tax Effect | 1,589 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossHeldToMaturityMember |
Securities: Unrealized holding losses, Net of Tax | (2,395)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossHeldToMaturityMember |
Securities: Less: gains recognized in income, Before Tax | (233)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossHeldToMaturityMember |
Securities: Less: gains recognized in income, Tax Effect | 93 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossHeldToMaturityMember |
Securities: Less: gains recognized in income, Net of Tax | (140)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossHeldToMaturityMember |
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax | (3,751)func_OtherComprehensiveIncomeLossHeldToMaturitySecuritiesAdjustmentBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossHeldToMaturityMember |
Held to maturity securities: Net unrealized losses on all HTM securities, Tax | 1,496 func_OtherComprehensiveIncomeLossHeldToMaturitySecuritiesAdjustmentTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossHeldToMaturityMember |
Held to maturity securities: Net unrealized losses on all HTM securities, After tax | (2,255)func_OtherComprehensiveIncomeLossHeldToMaturitySecuritiesAdjustmentAfterTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedNetUnrealizedInvestmentGainLossHeldToMaturityMember |
Pension Plan [Member] |  |
Unrealized net actuarial gain (loss), Before Tax | (10,833)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 4,790 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Unrealized net actuarial gain (loss), Tax Effect | 4,320 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (1,919)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Unrealized net actuarial gain (loss), Net of Tax | (6,513)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 2,871 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Less: amortization of unrecognized net gain (loss), Before Tax | (374)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (532)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Less: amortization of unrecognized net gain (loss), Tax Effect | 149 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 213 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Less: amortization of unrecognized net gain (loss), Net of Tax | (225)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (319)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Less: amortization of transition asset, Before Tax | 39 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 39 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Less: amortization of transition asset, Tax Effect | (16)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (16)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Less: amortization of transition asset, Net of Tax | 23 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 23 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Less: amortization of prior service costs, Before Tax | (12)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (12)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Less: amortization of prior service costs, Tax Effect | 5 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 5 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Less: amortization of prior service costs, Net of Tax | (7)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (7)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Net plan liability adjustment, Before Tax | (10,486)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 5,295 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Net plan liability adjustment, Tax Effect | 4,182 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (2,121)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Net plan liability adjustment, Net of Tax | (6,304)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 3,174 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
SERP [Member] |  |
Unrealized net actuarial gain (loss), Before Tax | (531)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | 170 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Unrealized net actuarial gain (loss), Tax Effect | 212 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | (68)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Unrealized net actuarial gain (loss), Net of Tax | (319)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | 102 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Less: amortization of unrecognized net gain (loss), Before Tax | (17)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | (3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Less: amortization of unrecognized net gain (loss), Tax Effect | 7 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | 1 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Less: amortization of unrecognized net gain (loss), Net of Tax | (10)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | (2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Less: amortization of prior service costs, Before Tax | (20)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | (20)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Less: amortization of prior service costs, Tax Effect | 8 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | 8 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Less: amortization of prior service costs, Net of Tax | (12)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | (12)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Net plan liability adjustment, Before Tax | (494)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | 193 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Net plan liability adjustment, Tax Effect | 197 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | (77)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember
Net plan liability adjustment, Net of Tax | $ (297)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember | $ 116 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = func_AccumulatedSupplementalEmployeeRetirementPlanAdjustmentMember

X
- Definition Other comprehensive income loss held to maturity securities adjustment after tax. + References No definition available. + Details
Name: | func_OtherComprehensiveIncomeLossHeldToMaturitySecuritiesAdjustmentAfterTax
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Other comprehensive income loss held to maturity securities adjustment before tax. + References No definition available. + Details
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