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Unearned ESOP Shares - Analysis of ESOP Shares Held in Suspense and Its Fair Value (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Rollforward] |
Shares in suspense, beginning of the year | 104,661us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares
Shares allocated | (104,661)us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP
Shares acquired | 0fcf_EmployeeStockOwnershipPlanEsopNumberOfAcquiredShares
Shares in suspense, end of the year | 0us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares
Fair market value of shares in suspense | $ 0fcf_EmployeeStockOwnershipPlanEsopFairMarketValueOfSuspenseShares

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- Definition Employee Stock Ownership Plan Esop Fair Market Value of Suspense Shares + References No definition available. + Details
Name: | fcf_EmployeeStockOwnershipPlanEsopFairMarketValueOfSuspenseShares
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Employee Stock Ownership Plan (ESOP), Number Of Acquired Shares + References No definition available. + Details
Name: | fcf_EmployeeStockOwnershipPlanEsopNumberOfAcquiredShares
Namespace Prefix: | fcf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Shares contributed to the ESOP that have not yet been released, committed to be released, or allocated to participant accounts. Suspense shares generally collateralize ESOP debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOPAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration