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Unearned ESOP Shares - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Borrowed funds		$ 1,600,000
ESOP [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Compensation costs	$ 733,000	$ 717,000	$ 783,000

X

- Definition

Compensation expense relation to the ESOP.

+ References

No definition available.

+ Details

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

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, collateralized financings, and capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_BorrowedFunds
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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