Net Income Per Share - Reconciliation of Net Income and Weighted Average Shares used in Computing Basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic net income per share:
Net income applicable to common shares	$ 1,721	$ 1,414	$ 2,432	$ 525
Weighted average common shares outstanding	11,108	10,791	11,038	10,834
Basic net income per share of common stock	$ 0.15	$ 0.13	$ 0.22	$ 0.05
Diluted net income per share:
Net income applicable to common shares	$ 1,721	$ 1,414	$ 2,432	$ 525
Weighted average common shares outstanding	11,108	10,791	11,038	10,834
Dilutive effects of stock options	2,036	637	1,858	612
Weighted average common shares, assuming dilutive effect of stock options	13,144	11,428	12,896	11,447
Diluted net income per share of common stock	$ 0.13	$ 0.12	$ 0.19	$ 0.05