Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock Issuance	Common Stock Issuance	Preferred Stock	Preferred Stock Preferred Stock Issuance	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	Treasury Stock Common Stock Issuance
Beginning Balance at Dec. 31, 2019	$ 2,342,176				$ 0		$ 556,110		$ 1,499,681		$ 1,079,391	$ (137)	$ (792,869)
Beginning Balance (in shares) at Dec. 31, 2019					0		164,218
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	178,040										178,040
Other comprehensive income (loss)	65,228											65,228
Stock issued	7,375		$ 192,878			$ 192,878	$ 1,807		907				4,661
Stock issued (in shares)						200	1,040
Merger-related expenses	0
Stock-based compensation awards	7,529								7,529
Acquisition of treasury stock	(39,748)												(39,748)
Acquisition of treasury stock (in shares)							(2,908)
Preferred stock dividend	(2,135)										(2,135)
Common stock cash dividends	(90,708)										(90,708)
Ending Balance at Dec. 31, 2020	2,616,828	$ (43,807)			$ 192,878		$ 557,917		1,508,117		1,120,781	65,091	(827,956)
Ending 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)	(37,680)											(37,680)
Stock issued	7,437						$ 1,849		3,354				2,234
Stock issued (in shares)							943
Merger-related expenses	0
Stock-based compensation awards	8,402								8,402
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)
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)	(412,887)											(412,887)
Stock issued				$ 7,876				$ 1,745		$ 3,420				$ 2,711
Stock issued (in shares)								900
Stock Issued During Period, Shares, Treasury Stock Reissued							6,209
Merger-related expenses	10,328
Stock Issued During Period, Value, Treasury Stock Reissued	89,713								4,547				85,166
Stock-based compensation awards	14,000								14,000
Preferred stock dividend	(10,248)										(10,248)
Common stock cash dividends	(108,358)										(108,358)
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