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Subsequent Event - Additional Information (Detail) (Subsequent Event [Member], USD $) | Jan. 28, 2014
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Subsequent Event [Member] |
Subsequent Event [Line Items] |
Additional shares authorized for repurchase | $ 25,000,000.0fcf_AdditionalAmountOfSharesAuthorizedToBeRepurchased / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Additional Amount Of Shares Authorized To Be Repurchased + References No definition available. + Details
Name: | fcf_AdditionalAmountOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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