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Earnings Per Common Share - Summary of Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator for both basic and diluted earnings per common share:        
Net income $ 37,347 $ 32,486 $ 122,497 $ 99,184
Denominator:        
Total average basic common shares outstanding 54,695,578 50,277,847 54,641,057 46,965,095
Effect of dilutive stock options and other stock compensation 55,766 154,265 64,704 142,734
Total diluted average common shares outstanding 54,751,344 50,432,112 54,705,761 47,107,829
Earnings per common share - basic $ 0.68 $ 0.65 $ 2.24 $ 2.11
Earnings per common share - diluted $ 0.68 $ 0.64 $ 2.24 $ 2.11