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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.05	$ 0.03
Common Stock [Member]
Cash Dividends Declared per Common Share (in dollars per share)	$ 0.05	$ 0.03
ESOP market value adjustment, gross	$ 0	$ 242
ESOP market value adjustment, tax benefit	$ 0	$ 85

X

- Definition

Gross adjustment to additional paid-in-capital resulting from changes in market value of common and preferred stock issued to employee benefit trust but unearned.

+ References

No definition available.

+ Details

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

X

- Definition

The tax effect of gross adjustment to additional paid-in-capital resulting from changes in market value of common and preferred stock issued to employee benefit trust but unearned.

+ References

No definition available.

+ Details

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

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration