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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic
Net income	$ 1,657	$ 936	$ 3,570	$ 2,229
Preferred stock dividends and discount accretion	290	294	580	588
Net income available to common shareholders	1,367	642	2,990	1,641
Weighted average common shares outstanding	7,707,917	7,707,917	7,707,917	7,707,917
Basic earnings per common share	$ 0.18	$ 0.08	$ 0.39	$ 0.21
Diluted
Net income	1,657	936	3,570	2,229
Preferred stock dividends and discount accretion	290	294	580	588
Net income available to common shareholders	$ 1,367	$ 642	$ 2,990	$ 1,641
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	$ 0.18	$ 0.08	$ 0.39	$ 0.21