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Subordinated Debentures - Subordinated Debentures Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Subordinated Borrowing [Line Items]
Subordinated Debentures outstanding, Amount	$ 105,750	$ 105,750
First Commonwealth Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Subordinated Debentures outstanding, Due	Jan. 01, 2029
Subordinated Debentures outstanding, Amount	33,583	33,583
Subordinated Debentures outstanding, Rate	9.50%	9.50%
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
Subordinated Debentures outstanding, Rate	LIBOR + 2.85	LIBOR + 2.85
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
Subordinated Debentures outstanding, Rate	LIBOR + 2.85	LIBOR + 2.85

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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