Income Per Share - Reconciliation of Basic and Diluted Income Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic IPS:
Net income available to common stockholders	$ 925,000	$ 1,166,000	$ 1,279,000	$ 2,150,000
Average common shares outstanding	7,376,726	7,488,906	7,396,627	7,488,788
Net income per share available to common shareholders, basic	$ 0.13	$ 0.16	$ 0.17	$ 0.29
Diluted IPS
Net income available to common stockholders	$ 925,000	$ 1,166,000	$ 1,279,000	$ 2,150,000
Average common shares outstanding	7,376,726	7,488,906	7,396,627	7,488,788
Dilutive effect of stock options
Average diluted shares outstanding	7,376,726	7,488,906	7,396,627	7,488,788
Net income per share available to common shareholders, diluted	$ 0.13	$ 0.16	$ 0.17	$ 0.29