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Fair Values of Assets and Liabilities - Losses Realized on Assets Measured on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Fair Value Disclosures [Abstract] |  |
Impaired loans | $ (555)fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnImpairedLoans | $ (3,996)fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnImpairedLoans
Other real estate owned | (69)fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnOtherRealEstateOwned | (363)fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnOtherRealEstateOwned
Total losses | $ (624)fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLoss | $ (4,359)fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLoss

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- Definition Net losses on assets measured on nonrecurring basis. + References No definition available. + Details
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Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net losses on impaired loans still held at the end of the period. + References No definition available. + Details
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Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
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- Definition Net losses on other real estate owned still held at the end of the period + References No definition available. + Details
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Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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