Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic
Net income	$ 859	$ 718	$ 2,358	$ 1,918
Dividends on non-vested restricted stock	(14)	(14)	(42)	(42)
Net income allocated to stockholders	$ 845	$ 704	$ 2,316	$ 1,876
Weighted average common shares outstanding	4,860,742	4,857,652	4,856,308	4,841,235
Basic earnings per common share	$ 0.17	$ 0.14	$ 0.48	$ 0.38
Diluted
Net income allocated to stockholders	$ 845	$ 704	$ 2,316	$ 1,876
Weighted average common shares outstanding for basic earnings per common share	4,860,742	4,857,652	4,856,308	4,841,235
Add: Dilutive effects of assumed exercise of stock options and restricted stock	89,411	75,814	89,411	75,814
Average shares and dilutive potential common shares	4,950,153	4,933,466	4,945,719	4,917,049
Diluted earnings per common share	$ 0.17	$ 0.14	$ 0.47	$ 0.38