Earnings Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net Income, Basic	$ 3,233	$ 6,094	$ 6,042	$ 8,352
Net Income, Diluted	$ 3,233	$ 6,094	$ 6,042	$ 8,352
Weighted Average Number of Shares Outstanding, Basic	2,365,764	2,432,717	2,373,109	2,465,740
Weighted Average Number of Shares Outstanding, Options	753,320	743,230	752,628	739,322
Weighted Average Number of Shares Outstanding, Diluted	3,119,084	3,175,947	3,125,737	3,205,062
Net Income Per Share, Basic	$ 1.37	$ 2.51	$ 2.55	$ 3.39
Net Income Per Share, Diluted	$ 1.04	$ 1.92	$ 1.93	$ 2.61