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Subordinated Debentures Subordinated Debentures, Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt Instrument [Line Items] |  |  |  |
Amortization of Debt Issuance Costs | $ 0 | $ 0 | $ 369 | $ 0
First Commonwealth Capital Trust II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Issuance Costs, Gross | 500 |  | 500 |
First Commonwealth Bank 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated Debt Par Amount | 50,000 |  | 50,000 |
First Commonwealth Bank 2033 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated Debt Par Amount | 50,000 |  | 50,000 |
Debt Issuance Costs, Gross | 1,100 |  | 1,100 |
First Commonwealth Capital Trust III [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Issuance Costs, Gross | 600 |  | 600 |
First Commonwealth Financial Corporation |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated Debt Par Amount | 6,000 |  | 6,000 |
Debt Issuance Costs, Gross | $ 600 |  | $ 600 |

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