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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic
Net income	$ 2,306	$ 1,566	$ 7,257	$ 5,136
Preferred stock dividends	406	289	1,467	869
Net income available to common shareholders - basic	1,900	1,277	5,790	4,267
Weighted average common shares outstanding - basic	7,707,917	7,707,917	7,707,917	7,707,917
Basic earnings per common share	$ 0.25	$ 0.17	$ 0.75	$ 0.55
Diluted
Net income available to common shareholders - basic	1,900	1,277	5,790	4,267
Preferred stock dividends on convertible preferred stock	406		1,201
Net income available to common shareholders - diluted	$ 2,306	$ 1,277	$ 6,991	$ 4,267
Weighted average common shares outstanding for earnings per common share basic	7,707,917	7,707,917	7,707,917	7,707,917
Add: Dilutive effects of convertible preferred shares	3,196,931		3,196,931
Average shares and dilutive potential common shares outstanding - diluted	10,904,848	7,707,917	10,904,848	7,707,917
Diluted earnings per common share	$ 0.21	$ 0.17	$ 0.64	$ 0.55