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Incentive Compensation Plan Incentive Compensation Plan - Restricted Stock Awards Estimated to be Granted on a Performance Award (Details) | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended
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Jan. 28, 2013 | Feb. 24, 2012 | Jan. 17, 2011 | Dec. 31, 2014 | 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] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Target Award Participants Earn | 40.00%fcf_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetAwardParticipantsEarn | 40.00%fcf_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetAwardParticipantsEarn | 40.00%fcf_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetAwardParticipantsEarn |  |  |  |  |  |  |  |
Performance Shares Awards As Percentage Of Target | 100.00%fcf_PerformanceSharesAwardsAsPercentageOfTarget | 100.00%fcf_PerformanceSharesAwardsAsPercentageOfTarget | 100.00%fcf_PerformanceSharesAwardsAsPercentageOfTarget |  |  |  |  |  |  |  |
Percentage Of Target Award Opportunities Maximum In Certain Cases | 200.00%fcf_PercentageOfTargetAwardOpportunitiesMaximumInCertainCases | 200.00%fcf_PercentageOfTargetAwardOpportunitiesMaximumInCertainCases | 200.00%fcf_PercentageOfTargetAwardOpportunitiesMaximumInCertainCases |  |  |  |  |  |  |  |
Vesting period of restricted stock | 1 year | 1 year | 1 year | 10 years |  |  |  |  |  |  |
Performance Based Stock Awards Vesting Period | 3 years | 3 years | 3 years |  |  |  |  |  |  |  |
Restricted Stock [Member] | Executive [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
Restricted Stock [Member] | Executive [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 |  |  |  |  |  |  |  |  |

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- Definition Performance Based Stock Awards Vesting Period + References No definition available. + Details
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- Definition Performance Shares Awards As Percentage Of Target + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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