CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance at Dec. 31, 2020		$ 5,161,334	$ 537,145	$ 168,133	$ 3,851,208	$ (731,806)	$ 158,635	$ 1,178,019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		187,093						187,093
Total other comprehensive income (loss), net of tax		(143,357)					(143,357)
Cash dividends declared on common stock		(49,093)						(49,093)
Cash dividends declared on preferred stock	[1]	(8,291)						(8,291)
Restricted share unit vesting and taxes paid related to net share settlement		(6,185)		271	(6,456)
Stock options exercised, net		12,552		574	11,978
Warrants exercised with net settlement and common stock reissued		0			(113)	116		(3)
Share-based compensation expense		7,664			7,664
Ending balance at Mar. 31, 2021		5,161,717	537,145	168,978	3,864,281	(731,690)	15,278	1,307,725
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
Total other comprehensive income (loss), net of tax		(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		(5,722)		302	(4,282)			(1,742)
Stock options exercised, net		1,767		226	1,541
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

[1] For the three months ended March 31, 2022 and 2021, dividends per share were $0.39 and $0.37 for Series D and Series E Preferred Stock, respectively.