Fixed/Floating Rate Junior Subordinated Deferrable Interest Debentures - Additional Information (Detail) (USD $)		1 Months Ended
	Jun. 30, 2013	Jul. 21, 2006 Capital Trust I	Dec. 15, 2006 Capital Trust II
Securities Financing Transaction [Line Items]
Floating/fixed rate capital securities, issued		$ 4,000,000	$ 8,000,000
Capital contribution		124,000	247,000
Principal amount of junior subordinated deferrable interest debentures, acquired		4,124,000	8,247,000
Interest rate Terms		The interest rate on the Debentures and the capital securities is variable and adjustable quarterly at 1.74% over the three-month LIBOR.	The interest rate on the Debentures and the capital securities is variable and adjustable quarterly at 1.74% over the three-month LIBOR.
Interest rate over three-month LIBOR		1.74%	1.74%
Debt maturity period		Oct. 01, 2036	Mar. 01, 2037
Deferred interest	$ 1,100,000