Capital Purchase Program - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended				12 Months Ended
	Jan. 16, 2009	Dec. 31, 2013	Dec. 31, 2013 Series A Preferred Stock [Member]	Dec. 07, 2011 Series A Preferred Stock [Member]	Dec. 31, 2013 One-time Non-cash Reduction [Member]
Equity, Class of Treasury Stock [Line Items]
Redemption of share, value				$ 108.7
Preferred stock redemption, shares				108,676
Net income available to common shareholders					1.8
Net income available to common shareholders, per share amount					$ 0.06
Purchase of common stock against warrant			517,012
Purchase of common stock against warrant, exercise price			$ 31.53
Common stock warrant issued	$ 4.0
Warrant Expiration Period		2019-01