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Subordinated Debentures - Subordinated Debentures Outstanding (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Subordinated Borrowing [Line Items]    
Subordinated Debentures outstanding, Amount $ 72,167 $ 72,167
First Commonwealth Capital Trust II [Member]    
Subordinated Borrowing [Line Items]    
Subordinated Debentures outstanding, Due Jan. 01, 2034  
Subordinated Debentures outstanding, Amount $ 30,929 30,929
First Commonwealth Capital Trust III [Member]    
Subordinated Borrowing [Line Items]    
Subordinated Debentures outstanding, Due Jan. 01, 2034  
Subordinated Debentures outstanding, Amount $ 41,238 $ 41,238