XML 86 R73.htm IDEA: XBRL DOCUMENT
v3.22.4

Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | $ 376,595 | $ 1,032,863
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses | (37,023) | (22,142)
Estimated Fair Value, 12 Months or More | 763,274 | 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | (174,250) | 0
Securities Continuous Unrealized Loss Position Fair Value | 1,139,869 | 1,032,863
SecuritiesContinuousUnrealizedLossPositionAggregateLosses | (211,273) | (22,142)
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 21,234 | 11,213
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses | (1,979) | (206)
Estimated Fair Value, 12 Months or More | 9,230 | 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | (2,181) | 0
Securities Continuous Unrealized Loss Position Fair Value | 30,464 | 11,213
SecuritiesContinuousUnrealizedLossPositionAggregateLosses | (4,160) | (206)
ERROR in label resolution. |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 587 |
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses | (13) |
Estimated Fair Value, 12 Months or More | 373 |
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | (27) |
Securities Continuous Unrealized Loss Position Fair Value | 960 |
SecuritiesContinuousUnrealizedLossPositionAggregateLosses | (40) |
Corporate Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 14,406 | 19,013
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses | (590) | (112)
Estimated Fair Value, 12 Months or More | 12,632 | 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | (2,395) | 0
Securities Continuous Unrealized Loss Position Fair Value | 27,038 | 19,013
SecuritiesContinuousUnrealizedLossPositionAggregateLosses | (2,985) | (112)
Foreign Government Debt |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months |  | 997
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses |  | (3)
Estimated Fair Value, 12 Months or More |  | 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses |  | 0
Securities Continuous Unrealized Loss Position Fair Value |  | 997
SecuritiesContinuousUnrealizedLossPositionAggregateLosses |  | (3)
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 3,734 |
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses | (405) |
Estimated Fair Value, 12 Months or More | 0 |
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | 0 |
Securities Continuous Unrealized Loss Position Fair Value | 3,734 |
SecuritiesContinuousUnrealizedLossPositionAggregateLosses | (405) |
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 239,760 | 658,965
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses | (21,543) | (14,779)
Estimated Fair Value, 12 Months or More | 482,195 | 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | (110,306) | 0
Securities Continuous Unrealized Loss Position Fair Value | 721,955 | 658,965
SecuritiesContinuousUnrealizedLossPositionAggregateLosses | (131,849) | (14,779)
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 92,208 | 320,414
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses | (12,364) | (6,398)
Estimated Fair Value, 12 Months or More | 240,241 | 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | (54,722) | 0
Securities Continuous Unrealized Loss Position Fair Value | 332,449 | 320,414
SecuritiesContinuousUnrealizedLossPositionAggregateLosses | (67,086) | (6,398)
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 4,666 |
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses | (129) |
Estimated Fair Value, 12 Months or More | 0 |
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | 0 |
Securities Continuous Unrealized Loss Position Fair Value | 4,666 |
SecuritiesContinuousUnrealizedLossPositionAggregateLosses | (129) |
Other Government - Sponsored Enterprises [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value, Less Than 12 Months | 0 | 22,261
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses | 0 | (644)
Estimated Fair Value, 12 Months or More | 18,603 | 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | (4,619) | 0
Securities Continuous Unrealized Loss Position Fair Value | 18,603 | 22,261
SecuritiesContinuousUnrealizedLossPositionAggregateLosses | $ (4,619) | $ (644)

X
- Definition SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses + References No definition available. + Details
Name: | fcf_SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition SecuritiesContinuousUnrealizedLossPositionAggregateLosses + References No definition available. + Details
Name: | fcf_SecuritiesContinuousUnrealizedLossPositionAggregateLosses
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Securities, Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses + References No definition available. + Details
Name: | fcf_SecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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_ForeignGovernmentDebtSecuritiesMember
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_ForeignGovernmentDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=fcf_OtherGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |