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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets, Gross [Abstract]    
Allowance for credit losses $ 18,218us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses $ 18,979us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Postretirement benefits other than pensions 679us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 726us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Alternative minimum tax credit carryforward 8,627us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 13,896us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Deferred Tax Assets, Litigation Reserve 3,000fcf_DeferredTaxAssetsLitigationReserve 0fcf_DeferredTaxAssetsLitigationReserve
Unrealized loss on securities available for sale 2,463us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 11,235us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Writedown of other real estate owned 603us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 207us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Deferred compensation 2,246us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 2,118us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Accrued interest on nonaccrual loans 1,059us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 1,481us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Other-than-temporary impairment of securities 9,239fcf_DeferredTaxAssetsOtherThanTemporaryImpairmentOfSecurities 9,693fcf_DeferredTaxAssetsOtherThanTemporaryImpairmentOfSecurities
Depreciation of assets 1,127us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 1,546us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Accrued incentives 1,594us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 1,153us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Unfunded loan commitment allowance 1,078fcf_DeferredTaxAssetsUnfundedLoanCommitmentAllowance 1,106fcf_DeferredTaxAssetsUnfundedLoanCommitmentAllowance
Deferred rent 969us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent 653us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent
Other 1,354us-gaap_DeferredTaxAssetsOther 2,462us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 52,256us-gaap_DeferredTaxAssetsGross 65,255us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Basis difference in assets acquired (344)fcf_DeferredTaxLiabilitiesBasisDifferenceInAssetsAcquired (518)fcf_DeferredTaxLiabilitiesBasisDifferenceInAssetsAcquired
Loan origination fees and costs (1,337)us-gaap_DeferredTaxLiabilitiesFinancingArrangements (637)us-gaap_DeferredTaxLiabilitiesFinancingArrangements
Income from unconsolidated subsidiary (603)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (590)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Other (318)us-gaap_DeferredTaxLiabilitiesOther (332)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (2,602)us-gaap_DeferredIncomeTaxLiabilities (2,077)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset $ 49,654us-gaap_DeferredTaxAssetsLiabilitiesNet $ 63,178us-gaap_DeferredTaxAssetsLiabilitiesNet