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Supplemental Cash Flow Disclosures - Non-cash Investing and Financing Activities (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash paid during the year for: |  |  |
Interest | $ 18,943us-gaap_InterestPaid | $ 23,022us-gaap_InterestPaid | $ 31,597us-gaap_InterestPaid
Income taxes | 10,700us-gaap_IncomeTaxesPaidNet | 3,080us-gaap_IncomeTaxesPaidNet | 11,641us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities: |  |  |
ESOP loan reductions | 0us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanEmployerCashPaymentsUsedForDebtService | 0us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanEmployerCashPaymentsUsedForDebtService | 1,600us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanEmployerCashPaymentsUsedForDebtService
Loans transferred to other real estate owned and repossessed assets | 5,061us-gaap_TransferOfOtherRealEstate | 12,326us-gaap_TransferOfOtherRealEstate | 4,979us-gaap_TransferOfOtherRealEstate
Other Real Estate Owned and Settled Out of Period | 0fcf_TransferOfOtherRealEstateOwned | 348fcf_TransferOfOtherRealEstateOwned | 0fcf_TransferOfOtherRealEstateOwned
Fair value of loans transferred from held to maturity to available for sale | 3,035us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 | 20,135us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 | 0us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
Gross (decrease) increase in market value adjustment to securities available for sale | 24,601fcf_GrossIncreaseInMarketValueAdjustmentToSecuritiesAvailableForSale | (33,792)fcf_GrossIncreaseInMarketValueAdjustmentToSecuritiesAvailableForSale | (874)fcf_GrossIncreaseInMarketValueAdjustmentToSecuritiesAvailableForSale
Unsettled treasury stock repurchases | $ 0fcf_Unsettledtreasurystockrepurchases | $ 0fcf_Unsettledtreasurystockrepurchases | $ 1,222fcf_Unsettledtreasurystockrepurchases

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- Definition The amount of cash provided by the employer through contributions or dividends that the ESOP used in the period to repay debt and interest on a third-party loan made directly to the ESOP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16545-113920 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition The amount of cash paid for interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Value transferred out of real estate owned (REO) in noncash transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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