XML 111 R98.htm IDEA: XBRL DOCUMENT
v3.22.4

Subordinated Debentures - Subordinated Debentures Outstanding (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | May 21, 2018
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated Debentures outstanding, Amount | $ 170,937 | $ 170,937 | $ 170,937 | $ 170,775 |
First Commonwealth Bank due 2028 [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated Debentures outstanding, Due | Jun. 01, 2028 |  |  |  |
Subordinated Debentures outstanding, Amount | $ 49,499 | 49,499 | 49,499 | 49,407 |
First Commonwealth Bank due 2033 [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated Debentures outstanding, Due | Jun. 01, 2033 |  |  |  |
Subordinated Debentures outstanding, Amount | $ 49,271 | 49,271 | 49,271 | 49,201 |
First Commonwealth Capital Trust II [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated Debentures outstanding, Due | Jan. 23, 2034 |  |  |  |
Subordinated Debentures outstanding, Amount | $ 30,929 | 30,929 | 30,929 | 30,929 |
First Commonwealth Capital Trust III [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated Debentures outstanding, Due | Apr. 06, 2034 |  |  |  |
Subordinated Debentures outstanding, Amount | $ 41,238 | $ 41,238 | $ 41,238 | $ 41,238 |
First Commonwealth Bank 2028 [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated Debentures outstanding, Amount |  |  |  |  | $ 50,000
First Commonwealth Bank 2033 [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Subordinated Debentures outstanding, Amount |  |  |  |  | $ 50,000
Subordinated Debt [Member] | LIBOR [Member] | First Commonwealth Capital Trust II [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Variable interest rate |  | 2.85% | 2.85% | 2.85% |
Subordinated Debt [Member] | LIBOR [Member] | First Commonwealth Capital Trust III [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Variable interest rate |  | 2.85% | 2.85% | 2.85% |
Subordinated Debt [Member] | LIBOR [Member] | First Commonwealth Bank 2028 [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Variable interest rate |  | 1.845% | 1.845% | 1.845% |
Debt Instrument, Interest Rate During Period |  | 4.875% |  | 4.875% |
Subordinated Debt [Member] | LIBOR [Member] | First Commonwealth Bank 2033 [Member] |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |
Variable interest rate |  | 2.37% | 2.37% | 2.37% |
Debt Instrument, Interest Rate During Period |  | 5.50% |  | 5.50% |

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the payments are due on subordinated debt, in YYYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_SubordinatedBorrowingDueDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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_SubordinatedBorrowingLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_SubordinatedDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fcf_FirstCommonwealthBankdue2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fcf_FirstCommonwealthBankdue2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fcf_FirstCommonwealthCapitalTrustTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fcf_FirstCommonwealthCapitalTrustThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fcf_FirstCommonwealthBank2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fcf_FirstCommonwealthBank2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |