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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 Contract | Mar. 31, 2014 Contract
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 8 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 21 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Total Pre-Modification Outstanding Recorded Investment | $ 2,249 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | $ 812 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post- Modification Outstanding Recorded Investment | 2,139 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | 791 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Specific Reserve | 0 fcf_FinancingReceivableModificationsSpecificReserve | 34 fcf_FinancingReceivableModificationsSpecificReserve
Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember
Total Pre-Modification Outstanding Recorded Investment | 1,498 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember | 60 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember
Post- Modification Outstanding Recorded Investment | 1,476 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember | 60 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember
Specific Reserve | 0 fcf_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember | 29 fcf_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember
Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 5 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember | 13 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember
Total Pre-Modification Outstanding Recorded Investment | 269 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember | 689 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember
Post- Modification Outstanding Recorded Investment | 203 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember | 676 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember
Specific Reserve | 0 fcf_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember | 5 fcf_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Total Pre-Modification Outstanding Recorded Investment | 464 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 12 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Post- Modification Outstanding Recorded Investment | 449 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 8 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Specific Reserve | 0 fcf_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 0 fcf_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember | 6 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember
Total Pre-Modification Outstanding Recorded Investment | 18 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember | 51 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember
Post- Modification Outstanding Recorded Investment | 11 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember | 47 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember
Specific Reserve | 0 fcf_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember | 0 fcf_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember
Extended Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 1,498 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember | 60 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 1,498 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember | 60 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember
Extended Maturity [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember
Extended Maturity [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember
Extended Maturity [Member] | Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ExtendedMaturityMember
Contractual Interest Rate Reduction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 252 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember | 203 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 252 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember | 172 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember | 31 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember / us-gaap_LoanRestructuringModificationAxis = us-gaap_ContractualInterestRateReductionMember
Contractual Payment Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 499 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember | 549 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember | 0 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialLoanMember / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember
Contractual Payment Modification [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 17 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember | 517 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 464 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember | 12 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | $ 18 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember | $ 20 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerLoanMember / us-gaap_LoanRestructuringModificationAxis = fcf_ContractualPaymentModificationMember

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