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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

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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