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Regulatory Restrictions and Capital Adequacy - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends declared per common share	$ 0.18	$ 0.12

X

- Definition

Cash Dividend Per Common Share Declared

+ References

No definition available.

+ Details

Name:	fcf_CashDividendPerCommonShareDeclared
Namespace Prefix:	fcf_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

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