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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 | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Impaired loans | $ (3,890) | $ (7,148) | $ (7,352) | $ (28,075)
Other real estate owned | (366) | (88) | (523) | (4,185)
Total losses | $ (4,256) | $ (7,236) | $ (7,875) | $ (32,260)

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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
Name: | fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnImpairedLoans
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | fcf_FairValueMeasurementOfAssetsOnNonrecurringBasisNetLossesOnOtherRealEstateOwned
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration