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Incentive Compensation Plan - Additional Information (Detail) (USD $)
0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Jan. 28, 2013
Feb. 24, 2012
Jan. 17, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 16, 2013
May 31, 2013
Mar. 01, 2013
Jan. 02, 2012
Apr. 01, 2011
Nov. 21, 2011
Jan. 22, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Maximum number of shares that are available to be awarded       5,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized                  
Fair value of restricted stock       $ 9.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 7.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 5.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue              
Options granted under plan       $ 4,500,000fcf_StockOptionsGranted                  
Vesting period of restricted stock 1 year 1 year 1 year 10 years                  
Intrinsic value of stock options exercised         1.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue                
Options exercised       0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 130,672us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised              
Granted, Shares       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       4,169,742us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant                  
Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Allocated Share-based Compensation Expense       1,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
                 
Fair value of restricted stock       $ 9.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
                 
Compensation expense         500,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
400,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
             
Unrecognized compensation cost related to unvested restricted stock       $ 2,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
                 
Executive [Member] | Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Common stock issued to executive 128,611,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
68,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
54,166,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
      3,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
45,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
30,120us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
Fair value of restricted stock             $ 7.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
$ 7.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
$ 7.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
$ 5.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
$ 6.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
$ 4.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
$ 5.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
Expiration of compensation plan             Aug. 16, 2016 May 31, 2016 Mar. 01, 2016 Jan. 01, 2016 Apr. 01, 2016 Nov. 21, 2014 Jan. 22, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights             1 3 1 4 1 1 2
Executive [Member] | Restricted Stock [Member] | Annual Incentive Plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Common stock issued to executive   90,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= fcf_AnnualIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
                     
Fair value of restricted stock   5.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= fcf_AnnualIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
                     
Expiration of compensation plan   Feb. 24, 2015                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights   1                      
Executive [Member] | Restricted Stock [Member] | Long Term Incentive Plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Common stock issued to executive   34,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= fcf_LongTermIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
                     
Fair value of restricted stock   5.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= fcf_LongTermIncentivePlanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
                     
Expiration of compensation plan   Dec. 31, 2014                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights   1