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Net Income Per Common Share - Basic and Diluted Net Income Per Common 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 Reconciliation [Abstract]        
Income available to common stockholders $ 14,688 $ 12,593 $ 29,345 $ 25,965
Income available to common stockholders plus assumed exercises of stock options $ 14,688 $ 12,593 $ 29,345 $ 25,965
Income available to common stockholders - Shares 15,468,511 15,232,129 15,405,847 15,235,397
Effect of stock options - Shares 363,669 247,620 353,942 246,473
Income available to common stockholders plus assumed exercises of stock options - Shares 15,832,180 15,479,749 15,759,789 15,481,870
Income available to common stockholders - Per Share Amount $ 0.94 $ 0.83 $ 1.90 $ 1.70
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount $ 0.92 $ 0.82 $ 1.86 $ 1.68