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Fair Values of Assets and Liabilities - Quantitative Inputs and Assumptions Used in Level 3 Fair Value Measurements (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value | 1,269,285,000 us-gaap_AvailableForSaleSecurities |  | $ 1,309,819,000 us-gaap_AvailableForSaleSecurities
Assets | 1,337,435,000 us-gaap_AssetsFairValueDisclosure |  | 1,368,052,000 us-gaap_AssetsFairValueDisclosure
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Minimum [Member] | Discount rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 5.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_PooledTrustPreferredCollateralizedDebtObligationsMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_DiscountRatesMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Maximum [Member] | Discount rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 14.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_PooledTrustPreferredCollateralizedDebtObligationsMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_DiscountRatesMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Minimum [Member] | Probability of default [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_PooledTrustPreferredCollateralizedDebtObligationsMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_ProbabilityOfDefaultMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = fcf_DiscountedCashFlowMember |  |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Minimum [Member] | Prepayment rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_PooledTrustPreferredCollateralizedDebtObligationsMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_PrepaymentRatesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = fcf_DiscountedCashFlowMember |  |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Maximum [Member] | Probability of default [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 100.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_PooledTrustPreferredCollateralizedDebtObligationsMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_ProbabilityOfDefaultMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = fcf_DiscountedCashFlowMember |  |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Maximum [Member] | Prepayment rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 100.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_PooledTrustPreferredCollateralizedDebtObligationsMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_PrepaymentRatesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = fcf_DiscountedCashFlowMember |  |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Weighted average [Member] | Probability of default [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 17.48%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_PooledTrustPreferredCollateralizedDebtObligationsMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_ProbabilityOfDefaultMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = fcf_DiscountedCashFlowMember |  |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Weighted average [Member] | Prepayment rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 6.35%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_PooledTrustPreferredCollateralizedDebtObligationsMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_PrepaymentRatesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = fcf_DiscountedCashFlowMember |  |
Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value | 1,920,000 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember |  | 1,420,000 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember
Interest Rate Swap [Member] | Option model [Member] | Minimum [Member] | Counterparty credit risk [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 3.74%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_CounterpartyCreditRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = fcf_OptionModelMember | [2] |
Interest Rate Swap [Member] | Option model [Member] | Maximum [Member] | Counterparty credit risk [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 6.62%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_CounterpartyCreditRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = fcf_OptionModelMember | [2] |
Impaired Loans [Member] | Reserve Study [Member] | NGL per gallon [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | 0.83 fcf_FairValueWeightedAverageInputsPrice / us-gaap_FairValueByAssetClassAxis = fcf_ImpairedLoansMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_NGLperbarrelMember / us-gaap_ValuationTechniqueAxis = fcf_ReserveStudyMember | [3] |
Impaired Loans [Member] | Reserve Study [Member] | Minimum [Member] | Gas per MCF [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | 3.84 fcf_FairValueWeightedAverageInputsPrice / us-gaap_FairValueByAssetClassAxis = fcf_ImpairedLoansMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_GasPerMcfMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = fcf_ReserveStudyMember | [3] |
Impaired Loans [Member] | Reserve Study [Member] | Minimum [Member] | Oil per BBL/d [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | 83.64 fcf_FairValueWeightedAverageInputsPrice / us-gaap_FairValueByAssetClassAxis = fcf_ImpairedLoansMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_OilPerBbldMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = fcf_ReserveStudyMember | [3] |
Impaired Loans [Member] | Reserve Study [Member] | Maximum [Member] | Gas per MCF [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | 6.45 fcf_FairValueWeightedAverageInputsPrice / us-gaap_FairValueByAssetClassAxis = fcf_ImpairedLoansMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_GasPerMcfMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = fcf_ReserveStudyMember | [3] |
Impaired Loans [Member] | Reserve Study [Member] | Maximum [Member] | Oil per BBL/d [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | 107.00 fcf_FairValueWeightedAverageInputsPrice / us-gaap_FairValueByAssetClassAxis = fcf_ImpairedLoansMember / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_OilPerBbldMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = fcf_ReserveStudyMember | [3] |
impaired Loans Valued Using a Reserve Study [Domain] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | 3,299,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = fcf_ImpairedLoansValuedUsingaReserveStudyDomain |  |
impaired Loans Valued Using a Reserve Study [Domain] | Reserve Study [Member] | Weighted average [Member] | Discount rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_ImpairedLoansValuedUsingaReserveStudyDomain / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_DiscountRatesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = fcf_ReserveStudyMember |  |
Impaired Loans Valued Using Discounted Cash Flows [Domain] | Reserve Study [Member] | Weighted average [Member] | Discount rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | 9.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = fcf_ImpairedLoansValuedUsingDiscountedCashFlowsDomain / fcf_FairValueMeasurementsSignificantAssumptionsTypeAxis = fcf_DiscountRatesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = fcf_ReserveStudyMember |  |
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value | 33,054,000 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 30,419,000 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Assets | 33,054,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 30,419,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 [Member] | Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value | 1,920,000 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 1,420,000 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value | 31,134,000 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember |  | 28,999,000 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value |  |  | 28,999,000 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Level 3 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value | 31,134,000 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other Real Estate Owned Assets Fair Value | 7,837,000 fcf_OtherRealEstateOwnedAssetsFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 7,981,000 fcf_OtherRealEstateOwnedAssetsFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Assets | 50,202,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 53,771,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other Real Estate Owned Assets Fair Value | 49,000 fcf_OtherRealEstateOwnedAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 153,000 fcf_OtherRealEstateOwnedAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Assets | 10,144,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 11,079,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Other Real Estate Owned [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other Real Estate Owned Assets Fair Value | 49,000 fcf_OtherRealEstateOwnedAssetsFairValue / us-gaap_FairValueByAssetClassAxis = fcf_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
[1] | incorporates spread over risk free rate related primarily to credit quality and illiquidity of securities.
[2] | .
[3] | unobservable inputs are defined as follows: MCF - million cubic feet; BBL/d - barrels per day; NGL - natural gas liquid.

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- Definition Fair Value Weighted Average Inputs Price + References No definition available. + Details
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- Definition Other real estate owned assets fair value. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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