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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net Income, Basic $ 2,232 $ 1,342 $ 10,584 $ 10,088
Net Income, Diluted $ 2,232 $ 1,342 $ 10,584 $ 10,088
Weighted Average Number of Shares Outstanding, Basic 2,415,303 2,608,319 2,448,743 2,645,924
Weighted Average Number of Shares Outstanding, Diluted 3,164,967 3,345,481 3,192,709 3,380,604
Net Income Per Share, Basic $ 0.92 $ 0.51 $ 4.32 $ 3.81
Net Income Per Share, Diluted $ 0.71 $ 0.40 $ 3.32 $ 2.98
Stock Options [Member]
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Effect of dilutive securities, Options 749,664 737,162 743,966 734,680