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Subordinated Debentures - Subordinated Debentures Outstanding (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | May 21, 2018
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | $ 177,741 | $ 170,937 |
First Commonwealth Bank due 2028 [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | 49,592 | 49,499 |
First Commonwealth Bank due 2033 [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | 49,341 | 49,271 |
First Commonwealth Capital Trust II [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | 30,929 | 30,929 |
First Commonwealth Capital Trust III [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | 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
First Commonwealth Financial Corporation |  |  |
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | $ 6,641 | $ 0 | $ 6,000
Subordinated Debt [Member] | First Commonwealth Capital Trust II [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument, Interest Rate During Period | 1.515% |  |
Subordinated Debt [Member] | First Commonwealth Capital Trust III [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument, Interest Rate During Period | 1.525% |  |
Subordinated Debt [Member] | First Commonwealth Bank 2033 [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument, Interest Rate During Period | 5.50% |  |
Subordinated Debt [Member] | First Commonwealth Financial Corporation |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument, Interest Rate During Period | 4.50% |  |

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1F Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- 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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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