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    <link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_0B73BBCE98BCDF73A057293769286CE5_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract_0B73BBCE98BCDF73A057293769286CE5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_0B73BBCE98BCDF73A057293769286CE5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_1AB03D3DFA5B3176BF19293769291C32_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_1AB03D3DFA5B3176BF19293769291C32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_1AB03D3DFA5B3176BF19293769291C32_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_1AB03D3DFA5B3176BF19293769291C32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_B90FC52137896AEFB132E30A95F7B5F5_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_B90FC52137896AEFB132E30A95F7B5F5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_B90FC52137896AEFB132E30A95F7B5F5" xlink:to="lab_us-gaap_SupplementalCashFlowInformationAbstract_B90FC52137896AEFB132E30A95F7B5F5" xlink:type="arc" />
    <link:label id="lab_us-gaap_TransferToOtherRealEstate_0CF59F294DE8F825C2F1E30A95F7C5F8_terseLabel_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_0CF59F294DE8F825C2F1E30A95F7C5F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Owned, Transfer to Real Estate Owned</link:label>
    <link:label id="lab_us-gaap_TransferToOtherRealEstate_0CF59F294DE8F825C2F1E30A95F7C5F8_label_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_0CF59F294DE8F825C2F1E30A95F7C5F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Owned, Transfer to Real Estate Owned</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TransferToOtherRealEstate" xlink:label="loc_us-gaap_TransferToOtherRealEstate_0CF59F294DE8F825C2F1E30A95F7C5F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TransferToOtherRealEstate_0CF59F294DE8F825C2F1E30A95F7C5F8" xlink:to="lab_us-gaap_TransferToOtherRealEstate_0CF59F294DE8F825C2F1E30A95F7C5F8" xlink:type="arc" />
    <link:label id="lab_fcf_CashPaidForInterestAndIncomeTaxesAbstract_AFD63D03EC81F0044C10E30A95F78989_terseLabel_en-US" xlink:label="lab_fcf_CashPaidForInterestAndIncomeTaxesAbstract_AFD63D03EC81F0044C10E30A95F78989" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid during the year for:</link:label>
    <link:label id="lab_fcf_CashPaidForInterestAndIncomeTaxesAbstract_AFD63D03EC81F0044C10E30A95F78989_label_en-US" xlink:label="lab_fcf_CashPaidForInterestAndIncomeTaxesAbstract_AFD63D03EC81F0044C10E30A95F78989" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Paid For Interest And Income Taxes [Abstract]</link:label>
    <link:label id="lab_fcf_CashPaidForInterestAndIncomeTaxesAbstract_AFD63D03EC81F0044C10E30A95F78989_documentation_en-US" xlink:label="lab_fcf_CashPaidForInterestAndIncomeTaxesAbstract_AFD63D03EC81F0044C10E30A95F78989" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cash paid for interest and income taxes during the period.</link:label>
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    <link:label id="lab_us-gaap_InterestPaid_CE14F5940704930D5E6FE30A95F7EABF_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaid_CE14F5940704930D5E6FE30A95F7EABF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_us-gaap_InterestPaid_CE14F5940704930D5E6FE30A95F7EABF_label_en-US" xlink:label="lab_us-gaap_InterestPaid_CE14F5940704930D5E6FE30A95F7EABF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_5D2F6C16B23F47C52D9AE30A95F7CC85_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_5D2F6C16B23F47C52D9AE30A95F7CC85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_5D2F6C16B23F47C52D9AE30A95F7CC85_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_5D2F6C16B23F47C52D9AE30A95F7CC85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_5D2F6C16B23F47C52D9AE30A95F7CC85" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_8580E1E96B28FB01B65CE30A95F76EA7_terseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_8580E1E96B28FB01B65CE30A95F76EA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-cash investing and financing activities:</link:label>
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    <link:label id="lab_us-gaap_TransferOfOtherRealEstate_1AB11AF2085C4B7276FAE30A95F724DE_terseLabel_en-US" xlink:label="lab_us-gaap_TransferOfOtherRealEstate_1AB11AF2085C4B7276FAE30A95F724DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans transferred to other real estate owned and repossessed assets</link:label>
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    <link:label id="lab_us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1_51D77029C3AFF8521C97E30A95F723B6_terseLabel_en-US" xlink:label="lab_us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1_51D77029C3AFF8521C97E30A95F723B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of loans transferred from held to maturity to available for sale</link:label>
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    <link:label id="lab_fcf_CreditValuationGainLossonDerivativeAssetGross_2693DCD9DF36498EF7C0E30A95F8FDA7_terseLabel_en-US" xlink:label="lab_fcf_CreditValuationGainLossonDerivativeAssetGross_2693DCD9DF36498EF7C0E30A95F8FDA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross (decrease) increase in market value adjustment to derivatives</link:label>
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    <link:label id="lab_fcf_InvestmentsCommittedtoPurchaseNotYetPaid_CAE927860ED0C73049F4E30A95F8CF9F_terseLabel_en-US" xlink:label="lab_fcf_InvestmentsCommittedtoPurchaseNotYetPaid_CAE927860ED0C73049F4E30A95F8CF9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments committed to purchase, not settled</link:label>
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    <link:label id="lab_us-gaap_CommitmentsToExtendCreditMember_071B234B271DF2405E60E2389BDD3ACF_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsToExtendCreditMember_071B234B271DF2405E60E2389BDD3ACF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments to extend credit</link:label>
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    <link:label id="lab_us-gaap_TimeDepositMaturitiesYearOne_6E8BDF5172DB7FAFDB1D29376A2BCA08_label_en-US" xlink:label="lab_us-gaap_TimeDepositMaturitiesYearOne_6E8BDF5172DB7FAFDB1D29376A2BCA08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Time Deposit Maturities, Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TimeDepositMaturitiesYearOne" xlink:label="loc_us-gaap_TimeDepositMaturitiesYearOne_6E8BDF5172DB7FAFDB1D29376A2BCA08" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TimeDepositMaturitiesYearTwo" xlink:label="loc_us-gaap_TimeDepositMaturitiesYearTwo_714E60C0FEE11AFDE35329376A2B8A39" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember_050BF7464CD561E73EAE29376B5FCE3E_terseLabel_en-US" xlink:label="lab_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember_050BF7464CD561E73EAE29376B5FCE3E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Securities sold under agreements to repurchase</link:label>
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    <link:label id="lab_fcf_InterestOnShortTermBorrowingsLineItems_7339B47298A28A3A09EF29376B5F0EC0_terseLabel_en-US" xlink:label="lab_fcf_InterestOnShortTermBorrowingsLineItems_7339B47298A28A3A09EF29376B5F0EC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest On Short Term Borrowings [Line Items]</link:label>
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    <link:label id="lab_us-gaap_AssetsAbstract_A1588671385639DD20D9E26EB1FD42EE_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_A1588671385639DD20D9E26EB1FD42EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
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    <link:label id="lab_us-gaap_Cash_696753742B7B04198B08E26EB1FD23E8_terseLabel_en-US" xlink:label="lab_us-gaap_Cash_696753742B7B04198B08E26EB1FD23E8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash</link:label>
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    <link:label id="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmount_101387C555898C2FF339E26EB1FDC723_terseLabel_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmount_101387C555898C2FF339E26EB1FDC723" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans</link:label>
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmount_101387C555898C2FF339E26EB1FDC723_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmount_101387C555898C2FF339E26EB1FDC723" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans and Leases Receivable, Net Amount</link:label>
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    <link:label id="lab_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_D200ABF217F561D50B52E26EB1FD0BAD_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_D200ABF217F561D50B52E26EB1FD0BAD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in subsidiaries</link:label>
    <link:label id="lab_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_D200ABF217F561D50B52E26EB1FD0BAD_label_en-US" xlink:label="lab_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_D200ABF217F561D50B52E26EB1FD0BAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_D200ABF217F561D50B52E26EB1FD0BAD" xlink:type="locator" />
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    <link:label id="lab_fcf_InvestmentsInUnconsolidatedSubsidiaries_8C3D33A82EAED126E3C6E26EB1FDDCB6_terseLabel_en-US" xlink:label="lab_fcf_InvestmentsInUnconsolidatedSubsidiaries_8C3D33A82EAED126E3C6E26EB1FDDCB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in unconsolidated subsidiary trusts</link:label>
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    <link:label id="lab_fcf_InvestmentinJointlyOwnedCompany_67245B23D4CB54E81A4EE26EB1FDB44D_terseLabel_en-US" xlink:label="lab_fcf_InvestmentinJointlyOwnedCompany_67245B23D4CB54E81A4EE26EB1FDB44D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment in Jointly-Owned Company</link:label>
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    <link:label id="lab_fcf_InvestmentinJointlyOwnedCompany_67245B23D4CB54E81A4EE26EB1FDB44D_documentation_en-US" xlink:label="lab_fcf_InvestmentinJointlyOwnedCompany_67245B23D4CB54E81A4EE26EB1FDB44D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Investment in Jointly-Owned Company</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_14E997F8AB69F970DCE6E26EB1FDC5BB_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_14E997F8AB69F970DCE6E26EB1FDC5BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Premises and equipment, net</link:label>
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    <link:label id="lab_fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInThreeYears_48E8252E04347AE5A81329376AAD9656_terseLabel_en-US" xlink:label="lab_fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInThreeYears_48E8252E04347AE5A81329376AAD9656" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
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    <link:label id="lab_us-gaap_LiabilityForFuturePolicyBenefits_C5C8DFE94368D01540E229376B2E1F93_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilityForFuturePolicyBenefits_C5C8DFE94368D01540E229376B2E1F93" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other liabilities</link:label>
    <link:label id="lab_us-gaap_LiabilityForFuturePolicyBenefits_C5C8DFE94368D01540E229376B2E1F93_label_en-US" xlink:label="lab_us-gaap_LiabilityForFuturePolicyBenefits_C5C8DFE94368D01540E229376B2E1F93" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liability for Future Policy Benefits</link:label>
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    <link:label id="lab_fcf_UsefulLifeOfCapitalizedSoftware_8DCE3E7C4F7071E79CF829376B2EED03_terseLabel_en-US" xlink:label="lab_fcf_UsefulLifeOfCapitalizedSoftware_8DCE3E7C4F7071E79CF829376B2EED03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Software purchases and developed are capitalized and amortized on straight-line basis</link:label>
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    <link:label id="lab_fcf_UsefulLifeOfCapitalizedSoftware_8DCE3E7C4F7071E79CF829376B2EED03_documentation_en-US" xlink:label="lab_fcf_UsefulLifeOfCapitalizedSoftware_8DCE3E7C4F7071E79CF829376B2EED03" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Useful life of capitalized software amortized on a straight-line basis.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_UsefulLifeOfCapitalizedSoftware" xlink:label="loc_fcf_UsefulLifeOfCapitalizedSoftware_8DCE3E7C4F7071E79CF829376B2EED03" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_UsefulLifeOfCapitalizedSoftware_8DCE3E7C4F7071E79CF829376B2EED03" xlink:to="lab_fcf_UsefulLifeOfCapitalizedSoftware_8DCE3E7C4F7071E79CF829376B2EED03" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_F2EE7D26D311908EC3E229376A5D6201_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_F2EE7D26D311908EC3E229376A5D6201" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Table]</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_F2EE7D26D311908EC3E229376A5D6201_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_F2EE7D26D311908EC3E229376A5D6201" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Table]</link:label>
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    <link:label id="lab_us-gaap_RegulatoryLiabilityDomain_2174C0125DA7C3E55CFC29376A5D10D6_label_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilityDomain_2174C0125DA7C3E55CFC29376A5D10D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Regulatory Liability [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RegulatoryLiabilityDomain" xlink:label="loc_us-gaap_RegulatoryLiabilityDomain_2174C0125DA7C3E55CFC29376A5D10D6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PostretirementBenefitCostsMember_B3FC8C97D11ACE99819C29376A5DD234_terseLabel_en-US" xlink:label="lab_us-gaap_PostretirementBenefitCostsMember_B3FC8C97D11ACE99819C29376A5DD234" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Postretirement Benefit Costs [Member]</link:label>
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    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_BED255BBFBA72700BEBB29376A5D93E2_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_BED255BBFBA72700BEBB29376A5D93E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Line Items]</link:label>
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    <link:label id="lab_us-gaap_ReserveForOffBalanceSheetActivitiesMember_3F12CB330F2C93C1B0A2E34EC4057100_label_en-US" xlink:label="lab_us-gaap_ReserveForOffBalanceSheetActivitiesMember_3F12CB330F2C93C1B0A2E34EC4057100" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reserve for Off-balance Sheet Activities [Member]</link:label>
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    <link:label id="lab_fcf_NonaccrualCommercialLoansAxis_4E7ED8D2F4F54E507186E34EC405FD22_terseLabel_en-US" xlink:label="lab_fcf_NonaccrualCommercialLoansAxis_4E7ED8D2F4F54E507186E34EC405FD22" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Nonaccrual Commercial Loans [Axis]</link:label>
    <link:label id="lab_fcf_NonaccrualCommercialLoansAxis_4E7ED8D2F4F54E507186E34EC405FD22_label_en-US" xlink:label="lab_fcf_NonaccrualCommercialLoansAxis_4E7ED8D2F4F54E507186E34EC405FD22" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonaccrual Commercial Loans [Axis]</link:label>
    <link:label id="lab_fcf_NonaccrualCommercialLoansAxis_4E7ED8D2F4F54E507186E34EC405FD22_documentation_en-US" xlink:label="lab_fcf_NonaccrualCommercialLoansAxis_4E7ED8D2F4F54E507186E34EC405FD22" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nonaccrual Commercial Loans [Axis]</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_NonaccrualCommercialLoansAxis" xlink:label="loc_fcf_NonaccrualCommercialLoansAxis_4E7ED8D2F4F54E507186E34EC405FD22" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_NonaccrualCommercialLoansAxis_4E7ED8D2F4F54E507186E34EC405FD22" xlink:to="lab_fcf_NonaccrualCommercialLoansAxis_4E7ED8D2F4F54E507186E34EC405FD22" xlink:type="arc" />
    <link:label id="lab_fcf_NonaccrualCommercialLoansDomain_0586873053F201E81F18E34EC4057A7E_terseLabel_en-US" xlink:label="lab_fcf_NonaccrualCommercialLoansDomain_0586873053F201E81F18E34EC4057A7E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Nonaccrual Commercial Loans [Domain]</link:label>
    <link:label id="lab_fcf_NonaccrualCommercialLoansDomain_0586873053F201E81F18E34EC4057A7E_label_en-US" xlink:label="lab_fcf_NonaccrualCommercialLoansDomain_0586873053F201E81F18E34EC4057A7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonaccrual Commercial Loans [Domain]</link:label>
    <link:label id="lab_fcf_NonaccrualCommercialLoansDomain_0586873053F201E81F18E34EC4057A7E_documentation_en-US" xlink:label="lab_fcf_NonaccrualCommercialLoansDomain_0586873053F201E81F18E34EC4057A7E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Domain] for Nonaccrual Commercial Loans [Axis]</link:label>
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    <link:label id="lab_fcf_LoanToDifferentProjectAxis_23B90A91AF83B14F0984E34EC405E24E_terseLabel_en-US" xlink:label="lab_fcf_LoanToDifferentProjectAxis_23B90A91AF83B14F0984E34EC405E24E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan To Different Project [Axis]</link:label>
    <link:label id="lab_fcf_LoanToDifferentProjectAxis_23B90A91AF83B14F0984E34EC405E24E_label_en-US" xlink:label="lab_fcf_LoanToDifferentProjectAxis_23B90A91AF83B14F0984E34EC405E24E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loan To Different Project [Axis]</link:label>
    <link:label id="lab_fcf_LoanToDifferentProjectAxis_23B90A91AF83B14F0984E34EC405E24E_documentation_en-US" xlink:label="lab_fcf_LoanToDifferentProjectAxis_23B90A91AF83B14F0984E34EC405E24E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Loan To Different Project [Axis]</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_LoanToDifferentProjectAxis" xlink:label="loc_fcf_LoanToDifferentProjectAxis_23B90A91AF83B14F0984E34EC405E24E" xlink:type="locator" />
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    <link:label id="lab_fcf_LoanToDifferentProjectDomain_E7AF9AFE4BD967D6DF29E34EC405D7EC_terseLabel_en-US" xlink:label="lab_fcf_LoanToDifferentProjectDomain_E7AF9AFE4BD967D6DF29E34EC405D7EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan To Different Project [Domain]</link:label>
    <link:label id="lab_fcf_LoanToDifferentProjectDomain_E7AF9AFE4BD967D6DF29E34EC405D7EC_label_en-US" xlink:label="lab_fcf_LoanToDifferentProjectDomain_E7AF9AFE4BD967D6DF29E34EC405D7EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loan To Different Project [Domain]</link:label>
    <link:label id="lab_fcf_LoanToDifferentProjectDomain_E7AF9AFE4BD967D6DF29E34EC405D7EC_documentation_en-US" xlink:label="lab_fcf_LoanToDifferentProjectDomain_E7AF9AFE4BD967D6DF29E34EC405D7EC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Loan To Different Project [Domain]</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_LoanToDifferentProjectDomain" xlink:label="loc_fcf_LoanToDifferentProjectDomain_E7AF9AFE4BD967D6DF29E34EC405D7EC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ConsumerLoanMember_BE9FF7FE5A53CBC1BA2EE34EC4064F92_terseLabel_en-US" xlink:label="lab_us-gaap_ConsumerLoanMember_BE9FF7FE5A53CBC1BA2EE34EC4064F92" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consumer Loan [Member]</link:label>
    <link:label id="lab_us-gaap_ConsumerLoanMember_BE9FF7FE5A53CBC1BA2EE34EC4064F92_label_en-US" xlink:label="lab_us-gaap_ConsumerLoanMember_BE9FF7FE5A53CBC1BA2EE34EC4064F92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consumer Loan [Member]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsumerLoanMember_BE9FF7FE5A53CBC1BA2EE34EC4064F92" xlink:to="lab_us-gaap_ConsumerLoanMember_BE9FF7FE5A53CBC1BA2EE34EC4064F92" xlink:type="arc" />
    <link:label id="lab_fcf_ImpairedLoansMember_DD32F262BD7702CEAB70E34EC406F1BA_terseLabel_en-US" xlink:label="lab_fcf_ImpairedLoansMember_DD32F262BD7702CEAB70E34EC406F1BA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impaired Loans [Member]</link:label>
    <link:label id="lab_fcf_ImpairedLoansMember_DD32F262BD7702CEAB70E34EC406F1BA_label_en-US" xlink:label="lab_fcf_ImpairedLoansMember_DD32F262BD7702CEAB70E34EC406F1BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impaired Loans [Member]</link:label>
    <link:label id="lab_fcf_ImpairedLoansMember_DD32F262BD7702CEAB70E34EC406F1BA_documentation_en-US" xlink:label="lab_fcf_ImpairedLoansMember_DD32F262BD7702CEAB70E34EC406F1BA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Impaired loans.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_ImpairedLoansMember" xlink:label="loc_fcf_ImpairedLoansMember_DD32F262BD7702CEAB70E34EC406F1BA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_ImpairedLoansMember_DD32F262BD7702CEAB70E34EC406F1BA" xlink:to="lab_fcf_ImpairedLoansMember_DD32F262BD7702CEAB70E34EC406F1BA" xlink:type="arc" />
    <link:label id="lab_us-gaap_MortgageLoansOnRealEstateLoanTypeAxis_1B309B288BBFEB354D7FE34EC40BE65A_terseLabel_en-US" xlink:label="lab_us-gaap_MortgageLoansOnRealEstateLoanTypeAxis_1B309B288BBFEB354D7FE34EC40BE65A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mortgage Loans on Real Estate, Loan Type [Axis]</link:label>
    <link:label id="lab_us-gaap_MortgageLoansOnRealEstateLoanTypeAxis_1B309B288BBFEB354D7FE34EC40BE65A_label_en-US" xlink:label="lab_us-gaap_MortgageLoansOnRealEstateLoanTypeAxis_1B309B288BBFEB354D7FE34EC40BE65A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage Loans on Real Estate, Loan Type [Axis]</link:label>
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    <link:label id="lab_fcf_NonAccrualStatusOfLoansAfterNumberOfDaysPastDue_2FEF8E44BF5F9DE68EECE34EC40C289D_terseLabel_en-US" xlink:label="lab_fcf_NonAccrualStatusOfLoansAfterNumberOfDaysPastDue_2FEF8E44BF5F9DE68EECE34EC40C289D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non Accrual Status Of Loans After Number Of Days Past Due</link:label>
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    <link:label id="lab_us-gaap_ProvisionForLoanAndLeaseLosses_9D78C337E60BB6F6DA41E34EC40C3F4E_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForLoanAndLeaseLosses_9D78C337E60BB6F6DA41E34EC40C3F4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for credit losses</link:label>
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    <link:loc xlink:href="fcf-20171231.xsd#fcf_MezzanineMember" xlink:label="loc_fcf_MezzanineMember_4300D8B2CEB30E78B0A5293768DB018B" xlink:type="locator" />
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    <link:label id="lab_fcf_PreTslIvMember_EA6783AB12385780BBAD293768DB73A2_terseLabel_en-US" xlink:label="lab_fcf_PreTslIvMember_EA6783AB12385780BBAD293768DB73A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre TSL IV [Member]</link:label>
    <link:label id="lab_fcf_PreTslIvMember_EA6783AB12385780BBAD293768DB73A2_label_en-US" xlink:label="lab_fcf_PreTslIvMember_EA6783AB12385780BBAD293768DB73A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre Tsl Iv [Member]</link:label>
    <link:label id="lab_fcf_PreTslIvMember_EA6783AB12385780BBAD293768DB73A2_documentation_en-US" xlink:label="lab_fcf_PreTslIvMember_EA6783AB12385780BBAD293768DB73A2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pre TSL IV.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_PreTslIvMember" xlink:label="loc_fcf_PreTslIvMember_EA6783AB12385780BBAD293768DB73A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_PreTslIvMember_EA6783AB12385780BBAD293768DB73A2" xlink:to="lab_fcf_PreTslIvMember_EA6783AB12385780BBAD293768DB73A2" xlink:type="arc" />
    <link:label id="lab_fcf_PreTslViiMember_62ED62E5374FFFC0DF26293768DB07A7_terseLabel_en-US" xlink:label="lab_fcf_PreTslViiMember_62ED62E5374FFFC0DF26293768DB07A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre TSL VII [Member]</link:label>
    <link:label id="lab_fcf_PreTslViiMember_62ED62E5374FFFC0DF26293768DB07A7_label_en-US" xlink:label="lab_fcf_PreTslViiMember_62ED62E5374FFFC0DF26293768DB07A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre Tsl Vii [Member]</link:label>
    <link:label id="lab_fcf_PreTslViiMember_62ED62E5374FFFC0DF26293768DB07A7_documentation_en-US" xlink:label="lab_fcf_PreTslViiMember_62ED62E5374FFFC0DF26293768DB07A7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pre TSL VII.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_PreTslViiMember" xlink:label="loc_fcf_PreTslViiMember_62ED62E5374FFFC0DF26293768DB07A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_PreTslViiMember_62ED62E5374FFFC0DF26293768DB07A7" xlink:to="lab_fcf_PreTslViiMember_62ED62E5374FFFC0DF26293768DB07A7" xlink:type="arc" />
    <link:label id="lab_fcf_PreTslViiiMember_07864CAA3A22589124C6293768DB7449_terseLabel_en-US" xlink:label="lab_fcf_PreTslViiiMember_07864CAA3A22589124C6293768DB7449" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre TSL VIII [Member]</link:label>
    <link:label id="lab_fcf_PreTslViiiMember_07864CAA3A22589124C6293768DB7449_label_en-US" xlink:label="lab_fcf_PreTslViiiMember_07864CAA3A22589124C6293768DB7449" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre Tsl Viii [Member]</link:label>
    <link:label id="lab_fcf_PreTslViiiMember_07864CAA3A22589124C6293768DB7449_documentation_en-US" xlink:label="lab_fcf_PreTslViiiMember_07864CAA3A22589124C6293768DB7449" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pre TSL VIII.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_PreTslViiiMember" xlink:label="loc_fcf_PreTslViiiMember_07864CAA3A22589124C6293768DB7449" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_PreTslViiiMember_07864CAA3A22589124C6293768DB7449" xlink:to="lab_fcf_PreTslViiiMember_07864CAA3A22589124C6293768DB7449" xlink:type="arc" />
    <link:label id="lab_fcf_PreTslIxMember_1ADDD308439D716BF8AB293768DB5E33_terseLabel_en-US" xlink:label="lab_fcf_PreTslIxMember_1ADDD308439D716BF8AB293768DB5E33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre TSL IX [Member]</link:label>
    <link:label id="lab_fcf_PreTslIxMember_1ADDD308439D716BF8AB293768DB5E33_label_en-US" xlink:label="lab_fcf_PreTslIxMember_1ADDD308439D716BF8AB293768DB5E33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre Tsl Ix [Member]</link:label>
    <link:label id="lab_fcf_PreTslIxMember_1ADDD308439D716BF8AB293768DB5E33_documentation_en-US" xlink:label="lab_fcf_PreTslIxMember_1ADDD308439D716BF8AB293768DB5E33" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pre TSL IX.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_PreTslIxMember" xlink:label="loc_fcf_PreTslIxMember_1ADDD308439D716BF8AB293768DB5E33" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_PreTslIxMember_1ADDD308439D716BF8AB293768DB5E33" xlink:to="lab_fcf_PreTslIxMember_1ADDD308439D716BF8AB293768DB5E33" xlink:type="arc" />
    <link:label id="lab_fcf_PreTslXMember_6680305B57DF85AB0A8029376926464A_terseLabel_en-US" xlink:label="lab_fcf_PreTslXMember_6680305B57DF85AB0A8029376926464A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre TSL X [Member]</link:label>
    <link:label id="lab_fcf_PreTslXMember_6680305B57DF85AB0A8029376926464A_label_en-US" xlink:label="lab_fcf_PreTslXMember_6680305B57DF85AB0A8029376926464A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre Tsl X [Member]</link:label>
    <link:label id="lab_fcf_PreTslXMember_6680305B57DF85AB0A8029376926464A_documentation_en-US" xlink:label="lab_fcf_PreTslXMember_6680305B57DF85AB0A8029376926464A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pre TSL X.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_PreTslXMember" xlink:label="loc_fcf_PreTslXMember_6680305B57DF85AB0A8029376926464A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_PreTslXMember_6680305B57DF85AB0A8029376926464A" xlink:to="lab_fcf_PreTslXMember_6680305B57DF85AB0A8029376926464A" xlink:type="arc" />
    <link:label id="lab_fcf_PreTslXiiMember_A6993E52E74FB5FD63D029376926F27B_terseLabel_en-US" xlink:label="lab_fcf_PreTslXiiMember_A6993E52E74FB5FD63D029376926F27B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre TSL XII [Member]</link:label>
    <link:label id="lab_fcf_PreTslXiiMember_A6993E52E74FB5FD63D029376926F27B_label_en-US" xlink:label="lab_fcf_PreTslXiiMember_A6993E52E74FB5FD63D029376926F27B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre Tsl Xii [Member]</link:label>
    <link:label id="lab_fcf_PreTslXiiMember_A6993E52E74FB5FD63D029376926F27B_documentation_en-US" xlink:label="lab_fcf_PreTslXiiMember_A6993E52E74FB5FD63D029376926F27B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pre TSL XII.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_PreTslXiiMember" xlink:label="loc_fcf_PreTslXiiMember_A6993E52E74FB5FD63D029376926F27B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_PreTslXiiMember_A6993E52E74FB5FD63D029376926F27B" xlink:to="lab_fcf_PreTslXiiMember_A6993E52E74FB5FD63D029376926F27B" xlink:type="arc" />
    <link:label id="lab_fcf_PreTslXiiiMember_AD9B01E28AB50F1106B0293769262D2E_terseLabel_en-US" xlink:label="lab_fcf_PreTslXiiiMember_AD9B01E28AB50F1106B0293769262D2E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre TSL XIII [Member]</link:label>
    <link:label id="lab_fcf_PreTslXiiiMember_AD9B01E28AB50F1106B0293769262D2E_label_en-US" xlink:label="lab_fcf_PreTslXiiiMember_AD9B01E28AB50F1106B0293769262D2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre Tsl Xiii [Member]</link:label>
    <link:label id="lab_fcf_PreTslXiiiMember_AD9B01E28AB50F1106B0293769262D2E_documentation_en-US" xlink:label="lab_fcf_PreTslXiiiMember_AD9B01E28AB50F1106B0293769262D2E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pre TSL XIII.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_PreTslXiiiMember" xlink:label="loc_fcf_PreTslXiiiMember_AD9B01E28AB50F1106B0293769262D2E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_PreTslXiiiMember_AD9B01E28AB50F1106B0293769262D2E" xlink:to="lab_fcf_PreTslXiiiMember_AD9B01E28AB50F1106B0293769262D2E" xlink:type="arc" />
    <link:label id="lab_fcf_PreTslXivMember_7777E9EF7A6E759B60E9293769261CB4_terseLabel_en-US" xlink:label="lab_fcf_PreTslXivMember_7777E9EF7A6E759B60E9293769261CB4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pre TSL XIV [Member]</link:label>
    <link:label id="lab_fcf_PreTslXivMember_7777E9EF7A6E759B60E9293769261CB4_label_en-US" xlink:label="lab_fcf_PreTslXivMember_7777E9EF7A6E759B60E9293769261CB4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre Tsl Xiv [Member]</link:label>
    <link:label id="lab_fcf_PreTslXivMember_7777E9EF7A6E759B60E9293769261CB4_documentation_en-US" xlink:label="lab_fcf_PreTslXivMember_7777E9EF7A6E759B60E9293769261CB4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Pre TSL XIV.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_PreTslXivMember" xlink:label="loc_fcf_PreTslXivMember_7777E9EF7A6E759B60E9293769261CB4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_PreTslXivMember_7777E9EF7A6E759B60E9293769261CB4" xlink:to="lab_fcf_PreTslXivMember_7777E9EF7A6E759B60E9293769261CB4" xlink:type="arc" />
    <link:label id="lab_fcf_MmcapIMember_1B0DB39AB923A107CEF3293769264E17_terseLabel_en-US" xlink:label="lab_fcf_MmcapIMember_1B0DB39AB923A107CEF3293769264E17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">MMCap I [Member]</link:label>
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    <link:label id="lab_fcf_MmcapIMember_1B0DB39AB923A107CEF3293769264E17_documentation_en-US" xlink:label="lab_fcf_MmcapIMember_1B0DB39AB923A107CEF3293769264E17" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">MMCap I.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_MmcapIMember" xlink:label="loc_fcf_MmcapIMember_1B0DB39AB923A107CEF3293769264E17" xlink:type="locator" />
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    <link:loc xlink:href="fcf-20171231.xsd#fcf_ImpairmentOfInvestmentSecuritiesLineItems" xlink:label="loc_fcf_ImpairmentOfInvestmentSecuritiesLineItems_542A37AC0B00E132B12D29376926992F" xlink:type="locator" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_F1C8FF445DE94705EADFE0A415ABD67F" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_F1C8FF445DE94705EADFE0A415ABD67F" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_7F5A355A7172CFD85EFBE0A415AB7FF5_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_7F5A355A7172CFD85EFBE0A415AB7FF5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Unrealized (Losses) Gains on Securities, before Tax</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_7F5A355A7172CFD85EFBE0A415AB7FF5_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_7F5A355A7172CFD85EFBE0A415AB7FF5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_7F5A355A7172CFD85EFBE0A415AB7FF5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_7F5A355A7172CFD85EFBE0A415AB7FF5" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_7F5A355A7172CFD85EFBE0A415AB7FF5" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_46F1E52038787594DB5CE0A415AB924B_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_46F1E52038787594DB5CE0A415AB924B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Unrealized holding gains on derivatives arising during the period, Pretax Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_46F1E52038787594DB5CE0A415AB924B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_46F1E52038787594DB5CE0A415AB924B" xlink:to="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_46F1E52038787594DB5CE0A415AB924B" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_39B1E1EA85B4B728A3D6E0A415AB3083_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_39B1E1EA85B4B728A3D6E0A415AB3083" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassification adjustment for gains on derivatives included in net income, Pretax Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_39B1E1EA85B4B728A3D6E0A415AB3083" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_39B1E1EA85B4B728A3D6E0A415AB3083" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax_39B1E1EA85B4B728A3D6E0A415AB3083" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax_6249790BBB4F712AA6B5E0A415AB3A02_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax_6249790BBB4F712AA6B5E0A415AB3A02" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total unrealized gains on derivatives, Pretax Amount</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax_6249790BBB4F712AA6B5E0A415AB3A02_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax_6249790BBB4F712AA6B5E0A415AB3A02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax_6249790BBB4F712AA6B5E0A415AB3A02" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax_6249790BBB4F712AA6B5E0A415AB3A02" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax_6249790BBB4F712AA6B5E0A415AB3A02" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_F7E133F21130A7E7C20CE0A415ABF392_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_F7E133F21130A7E7C20CE0A415ABF392" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Unrealized holding gains on derivatives arising during the period, Tax (Expense) Benefit</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_F7E133F21130A7E7C20CE0A415ABF392_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_F7E133F21130A7E7C20CE0A415ABF392" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_F7E133F21130A7E7C20CE0A415ABF392" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_F7E133F21130A7E7C20CE0A415ABF392" xlink:to="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_F7E133F21130A7E7C20CE0A415ABF392" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_9A65DEFF769F8D1B6EE0E0A415AB3FF8_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_9A65DEFF769F8D1B6EE0E0A415AB3FF8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_9A65DEFF769F8D1B6EE0E0A415AB3FF8_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_9A65DEFF769F8D1B6EE0E0A415AB3FF8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_9A65DEFF769F8D1B6EE0E0A415AB3FF8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_9A65DEFF769F8D1B6EE0E0A415AB3FF8" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_9A65DEFF769F8D1B6EE0E0A415AB3FF8" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax_D091E4E677707DBC5334E0A415AB76D8_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax_D091E4E677707DBC5334E0A415AB76D8" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total unrealized gains on derivatives, Tax (Expense) Benefit</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax_D091E4E677707DBC5334E0A415AB76D8_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax_D091E4E677707DBC5334E0A415AB76D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax_D091E4E677707DBC5334E0A415AB76D8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax_D091E4E677707DBC5334E0A415AB76D8" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax_D091E4E677707DBC5334E0A415AB76D8" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A8732528B5862755F6B3E0A415ABA4BF_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A8732528B5862755F6B3E0A415ABA4BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrealized holding gains on derivatives arising during the period, Net of Tax Amount</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A8732528B5862755F6B3E0A415ABA4BF_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A8732528B5862755F6B3E0A415ABA4BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A8732528B5862755F6B3E0A415ABA4BF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A8732528B5862755F6B3E0A415ABA4BF" xlink:to="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A8732528B5862755F6B3E0A415ABA4BF" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_611429D2E39E58102B52E0A415AB8E80_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_611429D2E39E58102B52E0A415AB8E80" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_611429D2E39E58102B52E0A415AB8E80_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_611429D2E39E58102B52E0A415AB8E80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_611429D2E39E58102B52E0A415AB8E80" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_611429D2E39E58102B52E0A415AB8E80" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_611429D2E39E58102B52E0A415AB8E80" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_2321A4EEC543D6ABEC82E0A415AB804C_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_2321A4EEC543D6ABEC82E0A415AB804C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total unrealized gains on derivatives, Tax (Expense) Benefit</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_2321A4EEC543D6ABEC82E0A415AB804C_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_2321A4EEC543D6ABEC82E0A415AB804C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_2321A4EEC543D6ABEC82E0A415AB804C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_2321A4EEC543D6ABEC82E0A415AB804C" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_2321A4EEC543D6ABEC82E0A415AB804C" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_E944A16938E925C66727E0A415AB1ED7_negatedLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_E944A16938E925C66727E0A415AB1ED7" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net (loss) gain, Pretax Amount</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_E944A16938E925C66727E0A415AB1ED7_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_E944A16938E925C66727E0A415AB1ED7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_E944A16938E925C66727E0A415AB1ED7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_E944A16938E925C66727E0A415AB1ED7" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent_E944A16938E925C66727E0A415AB1ED7" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_6555E56B295A00B66288E0A415AB2508_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_6555E56B295A00B66288E0A415AB2508" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total Unrealized Gains (Losses) for Postretirement Obligations, Before Tax</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_6555E56B295A00B66288E0A415AB2508_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_6555E56B295A00B66288E0A415AB2508" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_6555E56B295A00B66288E0A415AB2508" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_6555E56B295A00B66288E0A415AB2508" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_6555E56B295A00B66288E0A415AB2508" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTax_FEB64BF2046BAE5A1163E0A415AB88D5_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTax_FEB64BF2046BAE5A1163E0A415AB88D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total other comprehensive (loss) income, Pretax Amount</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTax_FEB64BF2046BAE5A1163E0A415AB88D5_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTax_FEB64BF2046BAE5A1163E0A415AB88D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), before Tax</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_486457D333C0434BAB54E0A415ABC6E1_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_486457D333C0434BAB54E0A415ABC6E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_A8D5007E254D23D25CC2E0A415AB7749_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_A8D5007E254D23D25CC2E0A415AB7749" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_CBCAFE6D64C6223E1783E0A415AB0F71_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_CBCAFE6D64C6223E1783E0A415AB0F71" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total Unrealized (Losses) Gains on Securities, Tax (Expense) Benefit</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_C611C4CB23CF92158373E0A415AB8BE6_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_C611C4CB23CF92158373E0A415AB8BE6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net (loss) gain, Tax (Expense) Benefit</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_C611C4CB23CF92158373E0A415AB8BE6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_C611C4CB23CF92158373E0A415AB8BE6" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax_C611C4CB23CF92158373E0A415AB8BE6" xlink:type="arc" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossTax_07AC7339B66B2BB0733DE0A415AB2555_negatedLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossTax_07AC7339B66B2BB0733DE0A415AB2555" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Total other comprehensive (loss) income, Tax (Expense) Benefit</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossTax_07AC7339B66B2BB0733DE0A415AB2555_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossTax_07AC7339B66B2BB0733DE0A415AB2555" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_07AC7339B66B2BB0733DE0A415AB2555" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_6D4093BBB874742761CBE0A415AB184B_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_6D4093BBB874742761CBE0A415AB184B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_6D4093BBB874742761CBE0A415AB184B" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_8EE46F9D708996F003C4E0A415ABFD48" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_88E9A7A8A806A42EDF9AE0A415ABE8FD_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_88E9A7A8A806A42EDF9AE0A415ABE8FD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total Unrealized (Losses) Gains on Securities, Net of Tax</link:label>
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    <link:label id="lab_fcf_CouponInterestRate_60502779AB7E18895B91E205F1C8271C_documentation_en-US" xlink:label="lab_fcf_CouponInterestRate_60502779AB7E18895B91E205F1C8271C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Coupon Interest Rate</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_CouponInterestRate" xlink:label="loc_fcf_CouponInterestRate_60502779AB7E18895B91E205F1C8271C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueInputsPrepaymentRate_0AA2F0AE3A66510D8B74E205F1C8D1D6_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsPrepaymentRate_0AA2F0AE3A66510D8B74E205F1C8D1D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepayment rate</link:label>
    <link:label id="lab_us-gaap_FairValueInputsPrepaymentRate_0AA2F0AE3A66510D8B74E205F1C8D1D6_label_en-US" xlink:label="lab_us-gaap_FairValueInputsPrepaymentRate_0AA2F0AE3A66510D8B74E205F1C8D1D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Prepayment Rate</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsPrepaymentRate_0AA2F0AE3A66510D8B74E205F1C8D1D6" xlink:to="lab_us-gaap_FairValueInputsPrepaymentRate_0AA2F0AE3A66510D8B74E205F1C8D1D6" xlink:type="arc" />
    <link:label id="lab_fcf_EstimateOfFutureCashFlowsPercentageInYearOneandTwo_2BF2901AC84BF2DCBB33E205F1C81667_terseLabel_en-US" xlink:label="lab_fcf_EstimateOfFutureCashFlowsPercentageInYearOneandTwo_2BF2901AC84BF2DCBB33E205F1C81667" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimate of future cash flows prepayment percentage in year three</link:label>
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    <link:label id="lab_fcf_EstimateOfFutureCashFlowsPercentageInYearOneandTwo_2BF2901AC84BF2DCBB33E205F1C81667_documentation_en-US" xlink:label="lab_fcf_EstimateOfFutureCashFlowsPercentageInYearOneandTwo_2BF2901AC84BF2DCBB33E205F1C81667" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Estimate Of Future Cash Flows Percentage In Year One and Two</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_EstimateOfFutureCashFlowsPercentageInYearOneandTwo" xlink:label="loc_fcf_EstimateOfFutureCashFlowsPercentageInYearOneandTwo_2BF2901AC84BF2DCBB33E205F1C81667" xlink:type="locator" />
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    <link:label id="lab_fcf_EstimateOfFutureCashFlowsPrepaymentPercentageAfterYearTwo_AC746A8DD51875F74DF0E205F1C8D22B_terseLabel_en-US" xlink:label="lab_fcf_EstimateOfFutureCashFlowsPrepaymentPercentageAfterYearTwo_AC746A8DD51875F74DF0E205F1C8D22B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimate of future cash flows prepayment percentage thereafter</link:label>
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    <link:label id="lab_fcf_EstimateOfFutureCashFlowsPrepaymentPercentageAfterYearTwo_AC746A8DD51875F74DF0E205F1C8D22B_documentation_en-US" xlink:label="lab_fcf_EstimateOfFutureCashFlowsPrepaymentPercentageAfterYearTwo_AC746A8DD51875F74DF0E205F1C8D22B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Estimate Of Future Cash Flows Prepayment Percentage After Year Two</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_EstimateOfFutureCashFlowsPrepaymentPercentageAfterYearTwo" xlink:label="loc_fcf_EstimateOfFutureCashFlowsPrepaymentPercentageAfterYearTwo_AC746A8DD51875F74DF0E205F1C8D22B" xlink:type="locator" />
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    <link:label id="lab_fcf_FairValueInputCouponRates_5D097576B0A67FAE3F2CE205F1C876EB_terseLabel_en-US" xlink:label="lab_fcf_FairValueInputCouponRates_5D097576B0A67FAE3F2CE205F1C876EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Input Coupon Rates</link:label>
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    <link:label id="lab_fcf_FairValueInputCouponRates_5D097576B0A67FAE3F2CE205F1C876EB_documentation_en-US" xlink:label="lab_fcf_FairValueInputCouponRates_5D097576B0A67FAE3F2CE205F1C876EB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value Input Coupon Rates</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_FairValueInputCouponRates" xlink:label="loc_fcf_FairValueInputCouponRates_5D097576B0A67FAE3F2CE205F1C876EB" xlink:type="locator" />
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    <link:label id="lab_fcf_ProbabilityOfDefault_DB6D097331EFC673EC05E205F1C86887_terseLabel_en-US" xlink:label="lab_fcf_ProbabilityOfDefault_DB6D097331EFC673EC05E205F1C86887" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Probability of default</link:label>
    <link:label id="lab_fcf_ProbabilityOfDefault_DB6D097331EFC673EC05E205F1C86887_label_en-US" xlink:label="lab_fcf_ProbabilityOfDefault_DB6D097331EFC673EC05E205F1C86887" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Probability Of Default</link:label>
    <link:label id="lab_fcf_ProbabilityOfDefault_DB6D097331EFC673EC05E205F1C86887_documentation_en-US" xlink:label="lab_fcf_ProbabilityOfDefault_DB6D097331EFC673EC05E205F1C86887" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Probability of default.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_ProbabilityOfDefault" xlink:label="loc_fcf_ProbabilityOfDefault_DB6D097331EFC673EC05E205F1C86887" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_fcf_ProbabilityOfDefault_DB6D097331EFC673EC05E205F1C86887" xlink:to="lab_fcf_ProbabilityOfDefault_DB6D097331EFC673EC05E205F1C86887" xlink:type="arc" />
    <link:label id="lab_fcf_ProjectedRecoveryRate_EC9EF5A6BE1906A9A61BE205F1C80D4D_terseLabel_en-US" xlink:label="lab_fcf_ProjectedRecoveryRate_EC9EF5A6BE1906A9A61BE205F1C80D4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Projected recovery rate</link:label>
    <link:label id="lab_fcf_ProjectedRecoveryRate_EC9EF5A6BE1906A9A61BE205F1C80D4D_label_en-US" xlink:label="lab_fcf_ProjectedRecoveryRate_EC9EF5A6BE1906A9A61BE205F1C80D4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Projected Recovery Rate</link:label>
    <link:label id="lab_fcf_ProjectedRecoveryRate_EC9EF5A6BE1906A9A61BE205F1C80D4D_documentation_en-US" xlink:label="lab_fcf_ProjectedRecoveryRate_EC9EF5A6BE1906A9A61BE205F1C80D4D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Projected recovery rate.</link:label>
    <link:loc xlink:href="fcf-20171231.xsd#fcf_ProjectedRecoveryRate" xlink:label="loc_fcf_ProjectedRecoveryRate_EC9EF5A6BE1906A9A61BE205F1C80D4D" xlink:type="locator" />
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    <link:label id="lab_fcf_ProbabilityPercentageAssignedToDefaultBankSubjectToMarketIndicators_5E42F470E775624C5685E205F1C8ED08_terseLabel_en-US" xlink:label="lab_fcf_ProbabilityPercentageAssignedToDefaultBankSubjectToMarketIndicators_5E42F470E775624C5685E205F1C8ED08" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Probability percentage assigned to default bank subject to market indicators</link:label>
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    <link:loc xlink:href="fcf-20171231.xsd#fcf_ProbabilityPercentageAssignedToDefaultBankSubjectToMarketIndicators" xlink:label="loc_fcf_ProbabilityPercentageAssignedToDefaultBankSubjectToMarketIndicators_5E42F470E775624C5685E205F1C8ED08" xlink:type="locator" />
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    <link:loc xlink:href="fcf-20171231.xsd#fcf_ProbabilityPercentageAssignedToDefaultBank" xlink:label="loc_fcf_ProbabilityPercentageAssignedToDefaultBank_0A4A5B71E621CE8E15CDE205F1C865BC" xlink:type="locator" />
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    <link:label id="lab_fcf_ProbabilitiesForPerformingCollateralRange_A107E9FD59AFEC026FBDE205F1C87204_terseLabel_en-US" xlink:label="lab_fcf_ProbabilitiesForPerformingCollateralRange_A107E9FD59AFEC026FBDE205F1C87204" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Probabilities for performing collateral range</link:label>
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    <link:label id="lab_fcf_PercentageOfCurrentPerformingCollateral_39B48507A2B19215FEF1E205F1C8424B_terseLabel_en-US" xlink:label="lab_fcf_PercentageOfCurrentPerformingCollateral_39B48507A2B19215FEF1E205F1C8424B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of Current Performing Collateral</link:label>
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    <link:label id="lab_fcf_ExcessPresentValueOfFutureCashFlowsOverOurCurrentBookValue_CBDDCEAD641D290117DEE205F1C8D998_terseLabel_en-US" xlink:label="lab_fcf_ExcessPresentValueOfFutureCashFlowsOverOurCurrentBookValue_CBDDCEAD641D290117DEE205F1C8D998" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Excess percent value of future cash flows over current book value</link:label>
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    <link:label id="lab_us-gaap_GainLossOnSaleOfSecuritiesNet_EEA805FB18DE30BC8254E2389CCD5793_terseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfSecuritiesNet_EEA805FB18DE30BC8254E2389CCD5793" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net securities gains (losses)</link:label>
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    <link:label id="lab_us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities_0BDD7126B3F5AF9AF399E2389CCD24B5_terseLabel_en-US" xlink:label="lab_us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities_0BDD7126B3F5AF9AF399E2389CCD24B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trust income</link:label>
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    <link:label id="lab_us-gaap_FeesAndCommissionsDepositorAccounts_E6BA2C9D9457997B38B5E2389CCD19FC_terseLabel_en-US" xlink:label="lab_us-gaap_FeesAndCommissionsDepositorAccounts_E6BA2C9D9457997B38B5E2389CCD19FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service charges on deposit accounts</link:label>
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    <link:label id="lab_us-gaap_BankOwnedLifeInsuranceIncome_481D6D7A5FB779C058E6E2389CCDB696_terseLabel_en-US" xlink:label="lab_us-gaap_BankOwnedLifeInsuranceIncome_481D6D7A5FB779C058E6E2389CCDB696" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income from bank owned life insurance</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract_8205EF0EA2C081CEAB89E2389B01FB45_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract_8205EF0EA2C081CEAB89E2389B01FB45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment [Abstract]</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_C09FE61B408D3800FB1FE2389B017456_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_C09FE61B408D3800FB1FE2389B017456" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2016</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_C09FE61B408D3800FB1FE2389B017456" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_C36A0743FA58079B0F12E2389B0162A9_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_C36A0743FA58079B0F12E2389B0162A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
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    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_9C3554B96AF8C81C5BD829376AC78C66_label_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_9C3554B96AF8C81C5BD829376AC78C66" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_9C3554B96AF8C81C5BD829376AC78C66" xlink:to="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_9C3554B96AF8C81C5BD829376AC78C66" xlink:type="arc" />
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_F97304BA7618F1534AFD29376AC74F14_terseLabel_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_F97304BA7618F1534AFD29376AC74F14" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due after 5 but within 10 years</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_6FDCF21511164B22572029376AC77205" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_6FDCF21511164B22572029376AC77205" xlink:to="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_6FDCF21511164B22572029376AC77205" xlink:type="arc" />
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_46BAB9F6028DE9790C2529376AC7CC30_totalLabel_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_46BAB9F6028DE9790C2529376AC7CC30" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Amortized Cost</link:label>
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_46BAB9F6028DE9790C2529376AC7CC30_label_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_46BAB9F6028DE9790C2529376AC7CC30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_46BAB9F6028DE9790C2529376AC7CC30" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_46BAB9F6028DE9790C2529376AC7CC30" xlink:to="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_46BAB9F6028DE9790C2529376AC7CC30" xlink:type="arc" />
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueRollingMaturityAbstract_24FD01BFB67E9ACC41E629376AC747CC_terseLabel_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueRollingMaturityAbstract_24FD01BFB67E9ACC41E629376AC747CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated Fair Value</link:label>
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueRollingMaturityAbstract_24FD01BFB67E9ACC41E629376AC747CC_label_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValueRollingMaturityAbstract_24FD01BFB67E9ACC41E629376AC747CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturity [Abstract]</link:label>
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    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_4EC1EBD0F9E23EF145A529376AC7A0E2_terseLabel_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_4EC1EBD0F9E23EF145A529376AC7A0E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due within 1 year</link:label>
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_4EC1EBD0F9E23EF145A529376AC7A0E2_label_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_4EC1EBD0F9E23EF145A529376AC7A0E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_4EC1EBD0F9E23EF145A529376AC7A0E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_4EC1EBD0F9E23EF145A529376AC7A0E2" xlink:to="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_4EC1EBD0F9E23EF145A529376AC7A0E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_29A5DB363E4BAAF6D3BE29376AC75128_terseLabel_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_29A5DB363E4BAAF6D3BE29376AC75128" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due after 1 but within 5 years</link:label>
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_29A5DB363E4BAAF6D3BE29376AC75128_label_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_29A5DB363E4BAAF6D3BE29376AC75128" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_29A5DB363E4BAAF6D3BE29376AC75128" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_29A5DB363E4BAAF6D3BE29376AC75128" xlink:to="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_29A5DB363E4BAAF6D3BE29376AC75128" xlink:type="arc" />
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_7B368C2D7BA555EFBD5729376AC72F55_terseLabel_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_7B368C2D7BA555EFBD5729376AC72F55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due after 5 but within 10 years</link:label>
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_7B368C2D7BA555EFBD5729376AC72F55_label_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_7B368C2D7BA555EFBD5729376AC72F55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_7B368C2D7BA555EFBD5729376AC72F55" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_7B368C2D7BA555EFBD5729376AC72F55" xlink:to="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_7B368C2D7BA555EFBD5729376AC72F55" xlink:type="arc" />
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_BA60EAA306DAD80B7B1729376AC73138_terseLabel_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_BA60EAA306DAD80B7B1729376AC73138" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due after 10 years</link:label>
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_BA60EAA306DAD80B7B1729376AC73138_label_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_BA60EAA306DAD80B7B1729376AC73138" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_BA60EAA306DAD80B7B1729376AC73138" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_BA60EAA306DAD80B7B1729376AC73138" xlink:to="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_BA60EAA306DAD80B7B1729376AC73138" xlink:type="arc" />
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_28FC618209297A5C1E9229376AC7F34B_totalLabel_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_28FC618209297A5C1E9229376AC7F34B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Estimated Fair Value</link:label>
    <link:label id="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_28FC618209297A5C1E9229376AC7F34B_label_en-US" xlink:label="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_28FC618209297A5C1E9229376AC7F34B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_28FC618209297A5C1E9229376AC7F34B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_28FC618209297A5C1E9229376AC7F34B" xlink:to="lab_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_28FC618209297A5C1E9229376AC7F34B" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_7E365EB32176F382B90929376AC7E423" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities_BAF2439509BD0D0A238BE2389B0BD59F_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities_BAF2439509BD0D0A238BE2389B0BD59F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amounts Recognized in the Statement of Financial Condition as Other liabilities</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities_BAF2439509BD0D0A238BE2389B0BD59F_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities_BAF2439509BD0D0A238BE2389B0BD59F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liability, Defined Benefit Pension Plan</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities" xlink:label="loc_us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities_BAF2439509BD0D0A238BE2389B0BD59F" xlink:type="locator" />
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    <link:label id="lab_fcf_LongTermDebtTableTableTextBlock_0F39A4E4EFC47D567CDF29376ACF75B0_terseLabel_en-US" xlink:label="lab_fcf_LongTermDebtTableTableTextBlock_0F39A4E4EFC47D567CDF29376ACF75B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Other Long-Term Debt</link:label>
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