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Net Income Per Common Share - Basic and Diluted Net Income Per Common Share Based on Weighted-average Shares Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share Reconciliation [Abstract]        
Income available to common stockholders $ 21,710 $ 17,982 $ 66,942 $ 52,054
Income available to common stockholders plus assumed exercises of stock options $ 21,710 $ 17,982 $ 66,942 $ 52,054
Income available to common stockholders - Shares 31,838,392 31,262,188 31,792,270 31,143,980
Dilutive effect of stock options - Shares 753,885 582,230 741,949 581,580
Income available to common stockholders plus assumed exercises of stock options - Shares 32,592,277 31,844,418 32,534,219 31,725,560
Income available to common stockholders - Per Share Amount $ 0.68 $ 0.58 $ 2.11 $ 1.67
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount $ 0.67 $ 0.57 $ 2.06 $ 1.64