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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%