Income Per Share - Reconciliation of Basic and Diluted Income Per Share (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic IPS:
Net income	$ 509,000	$ 1,355,000
Average common shares outstanding	6,297,755	6,732,456
Net income per share	$ 0.08	$ 0.20
Diluted IPS:
Net Income	$ 509,000	$ 1,355,000
Average common shares outstanding	6,297,755	6,732,456
Dilutive effect of stock options	0	0
Average diluted shares outstanding	6,297,755	6,732,456
Net income per share, diluted	$ 0.08	$ 0.20