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Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share Reconciliation [Abstract]        
Income available to common stockholders $ 48,192 $ 20,730 $ 90,712 $ 43,338
Income available to common stockholders plus assumed exercises of stock options $ 48,192 $ 20,730 $ 90,712 $ 43,338
Income available to common stockholders - Shares 32,779,227 32,651,262 32,768,102 32,665,425
Dilutive effect of stock options - Shares 626,696 424,231 639,591 531,996
Income available to common stockholders plus assumed exercises of stock options - Shares 33,405,923 33,075,493 33,407,693 33,197,421
Income available to common stockholders - Per Share Amount $ 1.47 $ 0.64 $ 2.77 $ 1.33
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount $ 1.45 $ 0.63 $ 2.72 $ 1.31