XML 54 R44.htm IDEA: XBRL DOCUMENT
v3.22.2

Schedule of Temporary Impairment Losses, Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 932,415 | $ 1,032,863
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (90,167) | (22,142)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 340,249 | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (57,925) | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 1,272,664 | 1,032,863
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (148,092) | (22,142)
Debt Securities, Held-to-maturity | 492,229 | 541,311
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 4 | 3,768
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (54,353) | (8,428)
Securities held to maturity, fair value | 437,880 | 536,651
US Government Agencies Debt Securities Commercial |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 341,750 |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (37,603) |
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 39,624 |
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (6,521) |
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 381,374 |
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (44,124) |
Residential Mortgage Backed Securities [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 542,171 | 658,965
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (48,546) | (14,779)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 273,596 | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (47,390) | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 815,767 | 658,965
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (95,936) | (14,779)
Debt Securities, Held-to-maturity | 350,888 | 387,848
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 2,800
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (38,361) | (5,758)
Securities held to maturity, fair value | 312,527 | 384,890
US Government-sponsored Enterprises Debt Securities [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 22,261
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (644)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 19,513 | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,548) | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 19,513 | 22,261
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3,548) | (644)
Debt Securities, Held-to-maturity | 22,061 | 21,904
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3,467) | (625)
Securities held to maturity, fair value | 18,594 | 21,279
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 24,376 | 11,213
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,589) | (206)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 2,535 | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (370) | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 26,911 | 11,213
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,959) | (206)
Debt Securities, Held-to-maturity | 27,345 | 29,402
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 4 | 414
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2,052) | (103)
Securities held to maturity, fair value | 25,297 | 29,713
Corporate Debt Securities [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 12,902 |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,098) |
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 4,981 |
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (96) |
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 17,883 |
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,194) |
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Debt Securities, Held-to-maturity | 6,056 | 7,309
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 148
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (69) | 0
Securities held to maturity, fair value | 5,987 | 7,457
US Government Agencies Debt Securities [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Debt Securities, Held-to-maturity | 84,900 |
Securities held to maturity, fair value | 74,500 |
US Government Agencies Residential Mortgage-backed Securities [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 4,269 |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (222) |
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 4,269 |
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (222) |
Debt Securities, Held-to-maturity | 2,147 | 2,409
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 101
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (136) | 0
Securities held to maturity, fair value | 2,011 | 2,510
Debt Security, Government, Non-US [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 960 | 997
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (40) | (3)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 960 | 997
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (40) | (3)
Debt Securities, Held-to-maturity | 1,000 | 1,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (40) | (3)
Securities held to maturity, fair value | 960 | 997
US Government Agency Debt Securities Commercial [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 5,987 | 320,414
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (69) | (6,398)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total | 5,987 | 320,414
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss | (69) | (6,398)
Debt Securities, Held-to-maturity | 82,732 | 91,439
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 305
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (10,228) | (1,939)
Securities held to maturity, fair value | $ 72,504 | 89,805
Corporate Securities [Member] |  |
Schedule of Unrealized Losses and Estimated Fair Values [Line Items] |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 19,013
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (112)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total |  | 19,013
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (112)

X
- Definition Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss + References No definition available. + Details
Name: | fcf_InvestmentSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAccumulatedLoss
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss + References No definition available. + Details
Name: | fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total + References No definition available. + Details
Name: | fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionFairValueTotal
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss + References No definition available. + Details
Name: | fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value + References No definition available. + Details
Name: | fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionLessthanTwelveMonthsFairValue
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value + References No definition available. + Details
Name: | fcf_InvestmentSecuritiesContinuousUnrealizedLossPositionTwelveMonthsorLongerFairValue
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Schedule of Unrealized Losses and Estimated Fair Values [Line Items] + References No definition available. + Details
Name: | fcf_ScheduleOfUnrealizedLossesAndEstimatedFairValuesLineItems
Namespace Prefix: | fcf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fcf_USGovernmentAgenciesDebtSecuritiesCommercialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fcf_USGovernmentAgencyDebtSecuritiesResidentialDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fcf_USGovernmentAgencyDebtSecuritiesCommercialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fcf_CorporateSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |