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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income, Basic $ 6,094 $ 7,423 $ 8,352 $ 8,746
Net income, Diluted $ 6,094 $ 7,423 $ 8,352 $ 8,746
Weighted average number of shares outstanding, Basic 2,432,717 2,637,825 2,465,740 2,664,934
Weighted average number of shares outstanding, Diluted 3,175,947 3,371,904 3,205,062 3,398,199
Net income per share, Basic $ 2.51 $ 2.81 $ 3.39 $ 3.28
Net income per share, Diluted $ 1.92 $ 2.20 $ 2.61 $ 2.57
Stock Options [Member]
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Effect of dilutive securities, Options 743,230 734,079 739,322 733,265