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Other Long-term Debt - Summary of Scheduled Loan Payments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Long Term Debt Maturities Repayments Of Principal [Line Items] |  |
Total, Amount | $ 89,459us-gaap_OtherLongTermDebt | $ 144,385us-gaap_OtherLongTermDebt

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- Details
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Namespace Prefix: | fcf_
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Balance Type: | na
Period Type: | duration

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- Definition Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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