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Earnings Per Share - Calculation of Basic and Diluted Earnings Per 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 Basic [Abstract]        
Net income $ 23,767 $ 23,948 $ 43,079 $ 34,748
Basic weighted average common shares 19,327,422 19,280,684 19,319,608 19,273,347
Basic earnings per common share $ 1.23 $ 1.24 $ 2.23 $ 1.80
Net income $ 23,767 $ 23,948 $ 43,079 $ 34,748
Weighted average common shares 19,327,422 19,280,684 19,319,608 19,273,347
Restricted stock and stock options 53,189 55,023 64,470 62,401
Diluted weighted average common shares 19,380,611 19,335,707 19,384,078 19,335,748
Diluted earnings per common share $ 1.23 $ 1.24 $ 2.22 $ 1.80