Earnings Per Common Share - Summary of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator for both basic and diluted earnings per common share:
Net income available to common shareholders	$ 26,385	$ 42,349	$ 59,546	$ 82,158
Denominator:
Total average basic common shares outstanding	59,521,872	59,263,949	59,452,315	59,240,958
Effect of dilutive stock options and other stock compensation	134,557	121,898	140,645	148,356
Total diluted average common shares outstanding	59,656,429	59,385,847	59,592,960	59,389,314
Earnings per common share - basic	$ 0.44	$ 0.71	$ 1.00	$ 1.39
Earnings per common share - diluted	$ 0.44	$ 0.71	$ 1.00	$ 1.38