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Subordinated Debentures - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) trust Rate | Dec. 31, 2023 USD ($) | May 21, 2018 USD ($)
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | $ 128,305 | $ 177,741 |
Number of trusts | trust | 2 |  |
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
Deferred finance costs | $ 1,100 |  |
First Commonwealth Capital Trust III [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | $ 41,238 | 41,238 |
Redemption price as percentage of principal amount | 100.00% |  |
Deferred finance costs | $ 600 |  |
First Commonwealth Capital Trust II [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | 30,929 | 30,929 |
Deferred finance costs | 500 |  |
First Commonwealth Financial Corporation |  |  |
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debentures outstanding, Amount | $ 6,727 | $ 6,641 | 6,000
Subordinated Debt, Fair Value Premium |  |  | $ 600
Subordinated Debt [Member] | First Commonwealth Bank 2033 [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument, Interest Rate During Period | Rate | 5.50% |  |
Subordinated Debt [Member] | First Commonwealth Capital Trust III [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument, Interest Rate During Period | Rate | 1.525% |  |
Subordinated Debt [Member] | First Commonwealth Capital Trust II [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument, Interest Rate During Period | Rate | 1.515% |  |
Subordinated Debt [Member] | First Commonwealth Financial Corporation |  |  |
Subordinated Borrowing [Line Items] |  |  |
Debt Instrument, Interest Rate During Period | Rate | 4.50% |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt [Member] | First Commonwealth Bank 2028 [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Variable interest rate | Rate | 1.845% |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt [Member] | First Commonwealth Bank 2033 [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Variable interest rate | Rate | 2.37% |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt [Member] | First Commonwealth Capital Trust III [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Variable interest rate | Rate | 2.85% |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt [Member] | First Commonwealth Capital Trust II [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Variable interest rate | Rate | 2.85% |  |
Prime Rate | Subordinated Debt [Member] | First Commonwealth Financial Corporation |  |  |
Subordinated Borrowing [Line Items] |  |  |
Variable interest rate | Rate | 1.00% |  |

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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://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 3: 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/1943274/2147478546/942-210-S99-1 Reference 4: 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/1943274/2147478777/944-210-S99-1 + Details
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