CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
Beginning balance at Dec. 31, 2021		$ 5,296,800		$ 537,145	$ 169,384	$ 3,894,109	$ (931,497)	$ (82,321)	$ 1,709,980
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		171,037							171,037
Other comprehensive income (loss), net of income taxes		(579,744)						(579,744)
Cash dividends declared on common stock		(49,442)							(49,442)
Cash dividends declared on preferred stock	[1]	(8,291)							(8,291)
Repurchases of common stock including costs to repurchase		(9,671)					(9,671)
Restricted share unit vesting and taxes paid related to net share settlement		(8,589)			302	(7,149)			(1,742)
Stock options exercised, net		4,634			226	4,408
Share-based compensation expense		7,901				7,901
Ending balance at Mar. 31, 2022		4,824,635		537,145	169,912	3,899,269	(941,168)	(662,065)	1,821,542
Beginning balance at Dec. 31, 2021		5,296,800		537,145	169,384	3,894,109	(931,497)	(82,321)	1,709,980
Ending balance at Dec. 31, 2022		$ 4,475,801	$ (297)	537,145	170,141	3,920,346	(944,484)	(1,442,117)	2,234,770	$ (297)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting standards update [Extensible List]		Accounting Standards Update 2023-02 [Member]
Net income		$ 202,159							202,159
Other comprehensive income (loss), net of income taxes		152,790						152,790
Cash dividends declared on common stock		(55,502)							(55,502)
Cash dividends declared on preferred stock	[1]	(8,291)							(8,291)
Restricted share unit vesting and taxes paid related to net share settlement		(10,103)			383	(8,280)			(2,206)
Stock options exercised, net		3,497			190	3,307
Share-based compensation expense		10,076				10,076
Ending balance at Mar. 31, 2023		$ 4,770,130		$ 537,145	$ 170,714	$ 3,925,449	$ (944,484)	$ (1,289,327)	$ 2,370,633

[1] For the three months ended March 31, 2023 and 2022, dividends per share were $0.39 and $0.37 for Series D and Series E Preferred Stock, respectively.