Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Issuance	Preferred Stock	Common Stock	Common Stock Common Stock Issuance	Additional Paid-in Capital	Additional Paid-in Capital Common Stock Issuance	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock, Common	Treasury Stock, Common Common Stock Issuance
Beginning Balance at Dec. 31, 2020	$ 2,616,828		$ 192,878	$ 557,917		$ 1,508,117		$ 1,120,781	$ 65,091	$ (827,956)
Beginning Balance (in shares) at Dec. 31, 2020			200	162,350
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	275,497							275,497
Other Comprehensive Income (Loss), Net of Tax	(37,680)								(37,680)
Stock issued	4,544			$ 720		3,960				(136)
Stock issued (in shares)				288
Stock-based compensation awards (repurchases)	6,357					7,792
Acquisition of treasury stock	(43,909)									(43,909)
Acquisition of treasury stock (in shares)				(2,803)
Preferred stock dividend	(10,277)							(10,277)
Common stock cash dividends	(103,618)							(103,618)
Dividend reinvestment activity (in shares)				362
Dividend reinvestment activity	4,938					4				4,934
Stock-based compensation awards (repurchases) (in shares)				293
Stock-based compensation awards (repurchases)				$ 1,129
Stock-based compensation awards (repurchases)										(2,564)
Ending Balance at Dec. 31, 2021	2,712,680		$ 192,878	$ 559,766		1,519,873		1,282,383	27,411	(869,631)
Ending Balance (in shares) at Dec. 31, 2021			200	160,490
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	286,981							286,981
Other Comprehensive Income (Loss), Net of Tax	(412,887)								(412,887)
Stock issued	4,330			$ 653		3,677
Stock issued (in shares)				261
Reissuance of treasury stock pursuant to acquisition (in shares)				6,209
Reissuance of treasury stock pursuant to acquisition	89,713					4,547				85,166
Stock-based compensation awards (repurchases)	12,312					13,658
Preferred stock dividend	(10,248)							(10,248)
Common stock cash dividends	(108,358)							(108,358)
Dividend reinvestment activity (in shares)				362
Dividend reinvestment activity	5,234					85				5,149
Stock-based compensation awards (repurchases) (in shares)				277
Stock-based compensation awards (repurchases)				$ 1,092
Stock-based compensation awards (repurchases)										(2,438)
Ending Balance at Dec. 31, 2022	2,579,757		$ 192,878	$ 561,511		1,541,840		1,450,758	(385,476)	(781,754)
Ending Balance (in shares) at Dec. 31, 2022			200	167,599
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	284,280							284,280
Other Comprehensive Income (Loss), Net of Tax	73,196								73,196
Stock issued		$ 3,160			$ 578		$ 2,548				$ 34
Stock issued (in shares)					231
Stock-based compensation awards (repurchases)	6,981					8,604
Acquisition of treasury stock	(77,056)									(77,056)
Acquisition of treasury stock (in shares)				(5,029)
Preferred stock dividend	(10,248)							(10,248)
Common stock cash dividends	(105,490)							(105,490)
Dividend reinvestment activity (in shares)				408
Dividend reinvestment activity	5,559					(132)				5,691
Stock-based compensation awards (repurchases) (in shares)				592
Stock-based compensation awards (repurchases)				$ 2,313
Stock-based compensation awards (repurchases)										(3,936)
Ending Balance at Dec. 31, 2023	$ 2,760,139		$ 192,878	$ 564,402		$ 1,552,860		$ 1,619,300	$ (312,280)	$ (857,021)
Ending Balance (in shares) at Dec. 31, 2023			200	163,801