Earnings per Common Share - Computation of Basic and Diluted Earnings per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic
Net income	$ 1,566	$ 1,384	$ 5,136	$ 3,613
Preferred stock dividends and discount accretion	289	316	869	903
Net income available to common shareholders	1,277	1,068	4,267	2,710
Weighted average common shares outstanding	7,707,917	7,707,917	7,707,917	7,707,917
Basic earnings per common share	$ 0.17	$ 0.14	$ 0.55	$ 0.35
Diluted
Net income	1,566	1,384	5,136	3,613
Preferred stock dividends and discount accretion	289	316	869	903
Net income available to common shareholders	$ 1,277	$ 1,068	$ 4,267	$ 2,710
Weighted average common shares outstanding for basic earnings per common share	7,707,917	7,707,917	7,707,917	7,707,917
Add: Dilutive effects of assumed exercises of stock options and warrants
Average shares and dilutive potential common shares outstanding	7,707,917	7,707,917	7,707,917	7,707,917
Diluted earnings per common share	$ 0.17	$ 0.14	$ 0.55	$ 0.35