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Subsequent Event - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
	Jan. 31, 2013	Jan. 29, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]
Additional shares authorized for repurchase		$ 25.0
Redemption of capital securities	$ 32.5
Redemption rate	9.50%

X

- 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

X

- Definition

Outstanding amount of capital securities to be redeemed.

+ References

No definition available.

+ Details

Name:	fcf_AmountOfCapitalSecuritiesToBeRedeemed
Namespace Prefix:	fcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Stock Repurchased During Period As Percentage Of Shares Outstanding

+ References

No definition available.

+ Details

Name:	fcf_StockRepurchasedDuringPeriodAsPercentageOfSharesOutstanding
Namespace Prefix:	fcf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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