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Other Long-term Debt - Summary of Other Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Long-term debt | $ 89,459us-gaap_OtherLongTermDebt | $ 144,385us-gaap_OtherLongTermDebt
Borrowings from FHLB [Member] |  |
Debt Instrument [Line Items] |  |
2013, Weighted Average Contractual Rate |  | 1.13%fcf_LongTermDebtWeightedAverageContractualRateInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2013, Weighted Average Effective Rate |  | 1.13%fcf_LongTermDebtWeightedAverageEffectiveRateInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2013, Amount |  | 57,892us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2014, Weighted Average Contractual Rate | 0.82%fcf_LongTermDebtWeightedAverageContractualRateInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 0.82%fcf_LongTermDebtWeightedAverageContractualRateInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2015, Weighted Average Contractual Rate | 3.82%fcf_LongTermDebtWeightedAverageContractualRateInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 4.64%fcf_LongTermDebtWeightedAverageContractualRateInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2016, Weighted Average Contractual Rate | 3.83%fcf_LongTermDebtWeightedAverageContractualRateInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 4.64%fcf_LongTermDebtWeightedAverageContractualRateInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2017, Weighted Average Contractual Rate | 3.83%fcf_LongTermDebtWeightedAverageContractualRateInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 4.64%fcf_LongTermDebtWeightedAverageContractualRateInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2018, Weighted Average Contractual Rate | 3.84%fcf_LongTermDebtWeightedAverageContractualRateInYearSix / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Thereafter, Weighted Average Contractual Rate |  | 4.66%fcf_LongTermDebtWeightedAverageContractualRateAfterYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Thereafter, Weighted Average Contractual Rate | 3.81%fcf_LongTermDebtWeightedAverageContractualRateAfterYearSix / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
2014, Weighted Average Effective Rate | 0.82%fcf_LongTermDebtWeightedAverageEffectiveRateInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 0.82%fcf_LongTermDebtWeightedAverageEffectiveRateInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2015, Weighted Average Effective Rate | 3.82%fcf_LongTermDebtWeightedAverageEffectiveRateInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 4.64%fcf_LongTermDebtWeightedAverageEffectiveRateInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2016, Weighted Average Effective Rate | 3.83%fcf_LongTermDebtWeightedAverageEffectiveRateInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 4.64%fcf_LongTermDebtWeightedAverageEffectiveRateInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2017, Weighted Average Effective Rate | 3.83%fcf_LongTermDebtWeightedAverageEffectiveRateInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 4.64%fcf_LongTermDebtWeightedAverageEffectiveRateInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2018, Weighted Average Effective Rate | 3.84%fcf_LongTermDebtWeightedAverageEffectiveRateInYearSix / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Thereafter, Weighted Average Effective Rate |  | 4.66%fcf_LongTermDebtWeightedAverageEffectiveRateAfterYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Thereafter, Weighted Average Effective Rate | 3.81%fcf_LongTermDebtWeightedAverageEffectiveRateAfterYearSix / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
2014, Amount | 80,142us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 79,971us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2015, Amount | 563us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 389us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2016, Amount | 585us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 407us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2017, Amount | 607us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 426us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
2018, Amount | 631fcf_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Thereafter, Amount |  | 5,300us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Thereafter, Amount | $ 6,931fcf_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSix / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |

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