XML 98 R68.htm IDEA: XBRL DOCUMENT v2.4.1.9

Cash and Due from Banks - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash and Due from Banks [Abstract]
Cash or balances held with the Federal Reserve Bank	$ 4.9fcf_AverageReserveBalancesWithFederalReserveBank	$ 2.9fcf_AverageReserveBalancesWithFederalReserveBank

X

- Definition

Average Reserve Balances With Federal Reserve Bank

+ References

No definition available.

+ Details

Name:	fcf_AverageReserveBalancesWithFederalReserveBank
Namespace Prefix:	fcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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