Derivative Instruments - Additional Information (Detail) (USD $)	0 Months Ended		9 Months Ended
	May 03, 2011	Aug. 01, 2008	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Term of interest rate swap agreement executed	5 years	5 years
Interest rate swap inception date	May 03, 2011	Aug. 01, 2008
Value of subordinated note hedged	$ 10,000,000	$ 10,000,000
Interest rate swap effective date	Sep. 15, 2013	Sep. 15, 2008
Interest rate	The interest rate swap involves the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2013 to September 15, 2018 without exchange of the underlying notional amount	The interest Rate swap involved the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2008 to the September 15, 2013 maturity date without exchange of the underlying notional amount
Interest rate swap maturity date		Sep. 15, 2013
Derivatives designated as fair value hedges			0	0
Accumulated other comprehensive loss estimated			379,000
Collateral amount for counterparty interest rate swap			$ 1,400,000	$ 1,400,000
LIBOR Plus 155 Basis Points [Member]
Derivative [Line Items]
Variable rate on the subordinated debt on effective date in case of interest rate swap			LIBOR plus 155 basis points
Variable interest rate on subordinate debt			1.78%
4.02% Fixed Rate Plus 155 Basis Points [Member]
Derivative [Line Items]
Variable rate on the subordinated debt on effective date in case of interest rate swap			4.02% fixed rate plus 155 basis points
Interest rate being paid by the corporation			5.57%
Interest Rate Swaps [Member]
Derivative [Line Items]
Derivative basis spread on variable rate			1.55%
Derivative fixed interest rate rate basis			4.02%