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Subordinated Debentures Schedule of Subordinated Debentures Outstanding (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Subordinated debentures | $ 177,679 | $ 170,937
First Commonwealth Bank 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Subordinated debentures | 49,569 | 49,499
First Commonwealth Bank 2033 [Member] |  |
Debt Instrument [Line Items] |  |
Subordinated debentures | 49,323 | 49,271
First Commonwealth Capital Trust II [Member] |  |
Debt Instrument [Line Items] |  |
Subordinated debentures | 30,929 | 30,929
First Commonwealth Capital Trust III [Member] |  |
Debt Instrument [Line Items] |  |
Subordinated debentures | 41,238 | 41,238
First Commonwealth Financial Corporation |  |
Debt Instrument [Line Items] |  |
Subordinated debentures | $ 6,620 | $ 0

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