Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock, Common
Beginning Balance at Dec. 31, 2022	$ 2,579,757	$ 192,878	$ 561,511	$ 1,541,840	$ 1,450,758	$ (385,476)	$ (781,754)
Beginning Balance (in shares) at Dec. 31, 2022		200	167,599
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	220,017				220,017
Other comprehensive income (loss)	(87,280)					(87,280)
Common stock issued (in shares)			185
Common stock issued	2,491		$ 463	2,001			27
Dividend reinvestment activity (in shares)			298
Dividend reinvestment activity	4,165			18			4,147
Stock-based compensation awards (repurchases)							(3,919)
Stock-based compensation awards (repurchases)			$ 2,305
Stock-based compensation awards (in shares)			589
Stock-based compensation awards (repurchases)	3,806			5,420
Acquisition of treasury stock (in shares)			(4,587)
Acquisition of treasury stock	(70,940)						(70,940)
Preferred stock dividend	(7,686)				(7,686)
Common stock cash dividends	(77,637)				(77,637)
Ending Balance at Sep. 30, 2023	2,566,693	$ 192,878	$ 564,279	1,549,279	1,585,452	(472,756)	(852,439)
Ending Balance (in shares) at Sep. 30, 2023		200	164,084
Beginning Balance at Jun. 30, 2023	2,642,152	$ 192,878	$ 564,137	1,545,706	1,542,163	(379,286)	(823,446)
Beginning Balance (in shares) at Jun. 30, 2023		200	166,097
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	72,097				72,097
Other comprehensive income (loss)	(93,470)					(93,470)
Common stock issued (in shares)			50
Common stock issued	661		$ 125	529			7
Dividend reinvestment activity (in shares)			109
Dividend reinvestment activity	1,363			(154)			1,517
Stock-based compensation awards (repurchases)							(26)
Stock-based compensation awards (repurchases)			$ 17
Stock-based compensation awards (in shares)			4
Stock-based compensation awards (repurchases)	3,189			3,198
Acquisition of treasury stock (in shares)			(2,176)
Acquisition of treasury stock	(30,491)						(30,491)
Preferred stock dividend	(2,562)				(2,562)
Common stock cash dividends	(26,246)				(26,246)
Ending Balance at Sep. 30, 2023	2,566,693	$ 192,878	$ 564,279	1,549,279	1,585,452	(472,756)	(852,439)
Ending Balance (in shares) at Sep. 30, 2023		200	164,084
Beginning Balance at Dec. 31, 2023	2,760,139	$ 192,878	$ 564,402	1,552,860	1,619,300	(312,280)	(857,021)
Beginning Balance (in shares) at Dec. 31, 2023		200	163,801
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	220,122				220,122
Other comprehensive income (loss)	68,978					68,978
Common stock issued (in shares)			19,313
Common stock issued	274,864		$ 48,283	226,569			12
Dividend reinvestment activity (in shares)			252
Dividend reinvestment activity	4,076			574			3,502
Stock-based compensation awards (repurchases)							(4,272)
Stock-based compensation awards (repurchases)			$ 1,988
Stock-based compensation awards (in shares)			525
Stock-based compensation awards (repurchases)	3,190			5,474
Acquisition of treasury stock (in shares)			(1,934)
Acquisition of treasury stock	(30,348)						(30,348)
Preferred stock dividend	(7,686)				(7,686)
Common stock cash dividends	(89,392)				(89,392)
Ending Balance at Sep. 30, 2024	3,203,943	$ 192,878	$ 614,673	1,785,477	1,742,344	(243,302)	(888,127)
Ending Balance (in shares) at Sep. 30, 2024		200	181,957
Beginning Balance at Jun. 30, 2024	3,101,609	$ 192,878	$ 614,523	1,781,090	1,712,646	(310,534)	(888,994)
Beginning Balance (in shares) at Jun. 30, 2024		200	181,831
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	63,206				63,206
Other comprehensive income (loss)	67,232					67,232
Common stock issued (in shares)			34
Common stock issued	554		$ 85	469
Dividend reinvestment activity (in shares)			75
Dividend reinvestment activity	1,326			300			1,026
Stock-based compensation awards (repurchases)							(159)
Stock-based compensation awards (repurchases)			$ 65
Stock-based compensation awards (in shares)			17
Stock-based compensation awards (repurchases)	3,524			3,618
Preferred stock dividend	(2,562)				(2,562)
Common stock cash dividends	(30,946)				(30,946)
Ending Balance at Sep. 30, 2024	$ 3,203,943	$ 192,878	$ 614,673	$ 1,785,477	$ 1,742,344	$ (243,302)	$ (888,127)
Ending Balance (in shares) at Sep. 30, 2024		200	181,957