Consolidated Statement of Shareholder Equity Statement - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Series E Preferred Stock [Member]	Preferred Stock Series F Issued	Preferred Stock Series G Issued	Common Stock	Preferred Stock	Common Stock	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member] Series E Preferred Stock [Member]	Retained Earnings [Member] Preferred Stock Series F Issued	Retained Earnings [Member] Preferred Stock Series G Issued	Treasury Stock Held	AOCI Attributable to Parent [Member]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Beginning Balance at Dec. 31, 2019	$ 3,207,770						$ 145,037	$ 937	$ 1,113,250	$ 2,061,352					$ (76,734)	$ (36,072)
Beginning Balance (Adoption of ASU No. 2016-13) at Dec. 31, 2019		$ (51,213)									$ (51,213)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	220,621									220,621
Other Comprehensive Income (Loss), Net of Tax	78,328															78,328
Dividends, Common Stock	(145,363)									(145,363)
Dividends, Preferred Stock			$ (7,875)									$ (7,875)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	12,179								(3,524)	0					15,703
Stock Issued During Period, Value, Stock Options Exercised	240								(194)						434
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(3,506)														(3,506)
Stock Repurchased During Period, Value	(76,556)														(76,556)
Ending Balance at Dec. 31, 2020	3,234,625						145,037	937	1,109,532	2,077,522					(140,659)	42,256
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared						$ 1.60
Preferred Stock, Dividends Per Share, Declared			$ 1,312.5
Net income	408,864									408,864
Other Comprehensive Income (Loss), Net of Tax	(64,836)															(64,836)
Dividends, Common Stock	(145,223)									(145,223)
Dividends, Preferred Stock				$ (7,875)									$ (7,875)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	13,662								4,235						9,427
Stock Issued During Period, Value, Stock Options Exercised	3,492								(5,173)						8,665
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(4,384)														(4,384)
Ending Balance at Dec. 31, 2021	3,438,325						145,037	937	1,108,594	2,333,288					(126,951)	(22,580)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared						1.60
Preferred Stock, Dividends Per Share, Declared				$ 1,312.5
Net income	644,283									644,283
Other Comprehensive Income (Loss), Net of Tax	(662,380)															(662,380)
Dividends, Common Stock	(247,791)									(247,791)
Dividends, Preferred Stock				$ (7,875)	$ (8,044)								$ (7,875)	$ (8,044)
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture	54,099								26,748						27,351
Stock Issued During Period, Value, Stock Options Exercised	703								(692)						1,395
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(23,655)														(23,655)
Stock Issued During Period, Value, Acquisitions	5,180,124						138,942	891	5,040,291
Stock Issued During Period, Value, Charitable Contributions	10,500								(1,701)						12,201
Stock Repurchased During Period, Value	(322,103)														(322,103)
Ending Balance at Dec. 31, 2022	$ 8,056,186						$ 283,979	$ 1,828	$ 6,173,240	$ 2,713,861					$ (431,762)	$ (684,960)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared						$ 1.60
Preferred Stock, Dividends Per Share, Declared				$ 1,312.5	$ 65.00