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
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	213,611				213,611
Other comprehensive income (loss)	(39,476)					(39,476)
Common stock issued	4,682		$ 1,705	2,309			668
Common stock issued (in shares)			770
Stock-based compensation awards	6,192			6,192
Acquisition of treasury stock (in shares)			(1,691)
Acquisition of treasury stock	(26,126)						(26,126)
Preferred stock dividend	(7,715)				(7,715)
Common stock cash dividends	(68,178)				(68,178)
Ending Balance at Sep. 30, 2021	2,699,818	$ 192,878	$ 559,622	1,516,618	1,258,499	25,615	(853,414)
Ending Balance (in shares) at Sep. 30, 2021		200	161,429
Beginning Balance at Jun. 30, 2021	2,692,958	$ 192,878	$ 559,485	1,513,645	1,208,086	47,201	(828,337)
Beginning Balance (in shares) at Jun. 30, 2021		200	162,988
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	75,583				75,583
Other comprehensive income (loss)	(21,586)					(21,586)
Common stock issued	1,967		$ 137	781			1,049
Common stock issued (in shares)			132
Stock-based compensation awards	2,192			2,192
Acquisition of treasury stock (in shares)			(1,691)
Acquisition of treasury stock	(26,126)						(26,126)
Preferred stock dividend	(2,562)				(2,562)
Common stock cash dividends	(22,608)				(22,608)
Ending Balance at Sep. 30, 2021	2,699,818	$ 192,878	$ 559,622	1,516,618	1,258,499	25,615	(853,414)
Ending Balance (in shares) at Sep. 30, 2021		200	161,429
Beginning Balance at Dec. 31, 2021	2,712,680	$ 192,878	$ 559,766	1,519,873	1,282,383	27,411	(869,631)
Beginning Balance (in shares) at Dec. 31, 2021		200	160,490
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	205,148				205,148
Other comprehensive income (loss)	(470,358)					(470,358)
Common stock issued	4,797		$ 1,506	1,998			1,293
Common stock issued (in shares)			699
Reissuance of treasury stock pursuant to acquisition	89,713			4,547			85,166
Reissuance of treasury stock pursuant to acquisition (in shares)			6,209
Stock-based compensation awards	10,166			10,166
Preferred stock dividend	(7,686)				(7,686)
Common stock cash dividends	(73,301)				(73,301)
Ending Balance at Sep. 30, 2022	2,471,159	$ 192,878	$ 561,272	1,536,584	1,406,544	(442,947)	(783,172)
Ending Balance (in shares) at Sep. 30, 2022		200	167,398
Beginning Balance at Jun. 30, 2022	2,471,093	$ 192,878	$ 561,181	1,527,756	1,363,344	(304,210)	(869,856)
Beginning Balance (in shares) at Jun. 30, 2022		200	161,057
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	70,871				70,871
Other comprehensive income (loss)	(138,737)					(138,737)
Common stock issued	2,099		$ 91	490			1,518
Common stock issued (in shares)			132
Reissuance of treasury stock pursuant to acquisition	89,713			4,547			85,166
Reissuance of treasury stock pursuant to acquisition (in shares)			6,209
Stock-based compensation awards	3,791			3,791
Preferred stock dividend	(2,562)				(2,562)
Common stock cash dividends	(25,109)				(25,109)
Ending Balance at Sep. 30, 2022	$ 2,471,159	$ 192,878	$ 561,272	$ 1,536,584	$ 1,406,544	$ (442,947)	$ (783,172)
Ending Balance (in shares) at Sep. 30, 2022		200	167,398