Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]	Treasury Stock, Common
Balance at Dec. 31, 2021	$ 4,439,555	$ 145,452	$ 642	$ 1,009,921	$ 2,956,966	$ 347,318	$ (20,744)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	579,150				579,150
Other comprehensive income, net of tax	(1,695,612)					(1,695,612)
Proceeds from stock option exercises/stock unit conversions (589,782 shares, 267,357 shares, and 399,810 shares during 2024, 2023, and 2022, respectively)	16,659		1	1,513	(9,990)		25,135
Stock-based compensation expense recognized in earnings	18,322			18,322
Purchase of treasury stock (577,637 shares, 436,765 shares, and 31,351 shares during 2024, 2023, and 2022, respectively)	(4,391)						(4,391)
Cash dividends paid on preferred stock (approximately $44.50 per share which is equivalent to approximately $1.11 per depositary share in 2024, 2023, and 2022)	(6,675)				(6,675)
Cash dividends – common stock ($3.74 per share, $3.58 per share, and $3.24 per share in 2024, 2023, and 2022, respectively)	(209,780)				(209,780)
Balance at Dec. 31, 2022	3,137,228	145,452	643	1,029,756	3,309,671	(1,348,294)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	597,973				597,973
Other comprehensive income, net of tax	229,075					229,075
Proceeds from stock option exercises/stock unit conversions (589,782 shares, 267,357 shares, and 399,810 shares during 2024, 2023, and 2022, respectively)	9,299		1	1,463	(10,958)		18,793
Stock-based compensation expense recognized in earnings	24,590			24,590
Purchase of treasury stock (577,637 shares, 436,765 shares, and 31,351 shares during 2024, 2023, and 2022, respectively)	(42,720)						(42,720)
Cash dividends paid on preferred stock (approximately $44.50 per share which is equivalent to approximately $1.11 per depositary share in 2024, 2023, and 2022)	(6,675)				(6,675)
Cash dividends – common stock ($3.74 per share, $3.58 per share, and $3.24 per share in 2024, 2023, and 2022, respectively)	(232,323)				(232,323)
Balance at Dec. 31, 2023	3,716,447	145,452	644	1,055,809	3,657,688	(1,119,219)	(23,927)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	582,542				582,542
Other comprehensive income, net of tax	(132,785)					(132,785)
Proceeds from stock option exercises/stock unit conversions (589,782 shares, 267,357 shares, and 399,810 shares during 2024, 2023, and 2022, respectively)	22,643				(39,627)		62,270
Stock-based compensation expense recognized in earnings	19,763			19,763
Purchase of treasury stock (577,637 shares, 436,765 shares, and 31,351 shares during 2024, 2023, and 2022, respectively)	(60,901)						(60,901)
Cash dividends paid on preferred stock (approximately $44.50 per share which is equivalent to approximately $1.11 per depositary share in 2024, 2023, and 2022)	(6,675)				(6,675)
Cash dividends – common stock ($3.74 per share, $3.58 per share, and $3.24 per share in 2024, 2023, and 2022, respectively)	(242,446)				(242,446)
Balance at Dec. 31, 2024	$ 3,898,588	$ 145,452	$ 644	$ 1,075,572	$ 3,951,482	$ (1,252,004)	$ (22,558)