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Premises and Equipment - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Amount paid under sale-leaseback arrangement | $ 321,000us-gaap_SaleLeasebackTransactionAmountDueUnderFinancingArrangement |  |
Gain on sale of branch | 297,000fcf_GainOnSaleOfBranches |  |
Sale-leaseback transaction | 15 year |  |
Total lease expense | 2,900,000us-gaap_LeaseAndRentalExpense | 4,200,000us-gaap_LeaseAndRentalExpense | 4,300,000us-gaap_LeaseAndRentalExpense
Premises and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation included in noninterest expense | 13,200,000us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesAndEquipmentMember | 10,400,000us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesAndEquipmentMember | 7,900,000us-gaap_Depreciation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesAndEquipmentMember
Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant and Equipment, Gross, Amount Subject to Reduction in Estimated Useful Life | 14,000,000fcf_PropertyPlantandEquipmentGrossAmountSubjecttoReductioninEstimatedUsefulLife / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |  |
Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property Plant and Equipment, Gross, Amount Subject to Reduction in Estimated Useful Life | $ 700,000fcf_PropertyPlantandEquipmentGrossAmountSubjecttoReductioninEstimatedUsefulLife / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |
Previously Reported [Member] | Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 6 years |  |
Previously Reported [Member] | Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 5 years |  |
After System Conversion in 2014 [Member] | Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 3 years |  |
After System Conversion in 2014 [Member] | Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 4 years |  |

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- Definition Gain On Sale Of Branches + References No definition available. + Details
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- Definition Property Plant and Equipment, Gross, Amount Subject to Reduction in Estimated Useful Life + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition The liability due as of the balance sheet date for leasebacks accounted for using the deposit method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6456341&loc=d3e50796-112755 + Details
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- Definition A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6456341&loc=d3e50796-112755 + Details
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- Details
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