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Subordinated Debentures - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
First Commonwealth Capital Trust [Member]
    
Subordinated Borrowing [Line Items]    
Percentage of common equity owned by First Commonwealth 100.00%  
First Commonwealth Capital Trust III [Member]
    
Subordinated Borrowing [Line Items]    
Floating rate LIBOR + 2.85 LIBOR + 2.85
Deferred issuance costs $ 630  
Redemption price as percentage of principal amount 100.00%  
First Commonwealth Capital Trust II [Member]
    
Subordinated Borrowing [Line Items]    
Floating rate LIBOR + 2.85 LIBOR + 2.85
Deferred issuance costs 471  
Redemption price as percentage of principal amount 100.00%  
First Commonwealth Capital Trust I [Member]
    
Subordinated Borrowing [Line Items]    
Deferred issuance costs $ 996  
Redemption price as percentage of principal amount 103.325%  
Fixed Interest Rate 9.50% 9.50%
Debentures authorized for redemption percentage 100.00%