Earnings per Share - Schedule of Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 86,933	$ 69,613	$ 62,773	$ 59,605	$ 87,946	$ 66,648	$ 72,234	$ 58,139	$ 278,924	$ 284,967	$ 58,583
Preferred stock dividends									(41)	(41)	(41)
Net income available to common equity									278,883	284,926	58,542
Dividends and undistributed earnings allocated to participating securities									(26)	(24)	(26)
Net income available to common shareholders									$ 278,857	$ 284,902	$ 58,516
Basic weighted-average shares outstanding (in shares)									39,216	39,371	39,307
Stock options and other stock-based awards (in shares)									130	164	166
Diluted weighted-average shares outstanding (in shares)									39,346	39,535	39,473
Antidilutive stock options (in shares)									0	0	0
Earnings per share:
Basic (in dollars per share)	$ 2.22	$ 1.78	$ 1.60	$ 1.51	$ 2.23	$ 1.69	$ 1.83	$ 1.48	$ 7.11	$ 7.24	$ 1.49
Diluted (in dollars per share)	$ 2.21	$ 1.77	$ 1.59	$ 1.51	$ 2.22	$ 1.69	$ 1.83	$ 1.47	$ 7.09	$ 7.21	$ 1.48