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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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