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Subordinated Debentures - Subordinated Debentures Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Apr. 02, 2013	Dec. 31, 2014	Dec. 31, 2013
Subordinated Borrowing [Line Items]
Subordinated Debentures outstanding, Amount		$ 72,167us-gaap_SubordinatedDebt	72,167us-gaap_SubordinatedDebt
First Commonwealth Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Fixed interest rate	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
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 Debt [Member] \| LIBOR [Member] \| First Commonwealth Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Variable interest rate		2.85%	2.85%
Subordinated Debt [Member] \| LIBOR [Member] \| First Commonwealth Capital Trust III [Member]
Subordinated Borrowing [Line Items]
Variable interest rate		2.85%	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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