Income Per Share - Reconciliation of Basic and Diluted Income (Loss) Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic IPS:
Net income available to common stockholders	$ 1,166,000	$ 903,000	$ 2,150,000	$ 1,373,000
Average common shares outstanding	7,488,906	7,485,283	7,488,788	7,484,498
Net income per share available to common shareholders, basic	$ 0.16	$ 0.12	$ 0.29	$ 0.18
Diluted IPS
Net income available to common stockholders	$ 1,166,000	$ 903,000	$ 2,150,000	$ 1,373,000
Average common shares outstanding	7,488,906	7,485,283	7,488,788	7,484,498
Dilutive effect of stock options
Average diluted shares outstanding	7,488,906	7,485,283	7,488,788	7,484,498
Net income per share available to common shareholders, diluted	$ 0.16	$ 0.12	$ 0.29	$ 0.18