CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative effect adoption adjustment	Common Stock	Preferred Stock	Surplus	Retained earnings	Retained earnings Cumulative effect adoption adjustment	Treasury stock	Accumulated other comprehensive (loss) income
Beginning balance at Dec. 31, 2022	$ 4,093,425	$ 28,752	$ 1,047	$ 22,143	$ 4,790,993	$ 3,834,348	$ 28,752	$ (2,030,178)	$ (2,524,928)
Increase Decrease In Stockholders Equity
Accounting Standards Update		ASU 2022-02
Net income	446,748					446,748
Issuance of stock	4,717		1		4,716
Dividends declared:
Common stock	(118,924)					(118,924)
Preferred stock	(1,059)					(1,059)
Common stock purchases	(4,491)							(4,491)
Stock based compensation	17,454				1,655			15,799
Other comprehensive loss, net of tax	(9,014)								(9,014)
Ending balance at Sep. 30, 2023	4,457,608		1,048	22,143	4,797,364	4,189,865		(2,018,870)	(2,533,942)
Beginning balance at Jun. 30, 2023	4,565,009		1,047	22,143	4,795,581	4,093,284		(2,018,611)	(2,328,435)
Increase Decrease In Stockholders Equity
Net income	136,609					136,609
Issuance of stock	1,600		1		1,599
Dividends declared:
Common stock	(39,675)					(39,675)
Preferred stock	(353)					(353)
Common stock purchases	(250)							(250)
Stock based compensation	175				184			(9)
Other comprehensive loss, net of tax	(205,507)								(205,507)
Ending balance at Sep. 30, 2023	4,457,608		1,048	22,143	4,797,364	4,189,865		(2,018,870)	(2,533,942)
Beginning balance at Dec. 31, 2023	5,146,953		1,048	22,143	4,843,399	4,194,851		(2,018,957)	(1,895,531)
Increase Decrease In Stockholders Equity
Net income	436,395					436,395
Issuance of stock	5,271				5,271
Dividends declared:
Common stock	(134,309)					(134,309)
Preferred stock	(1,059)					(1,059)
Common stock purchases	(65,923)							(65,923)
Stock based compensation	20,649				5,199			15,450
Other comprehensive loss, net of tax	382,537								382,537
Ending balance at Sep. 30, 2024	5,790,514		1,048	22,143	4,853,869	4,495,878		(2,069,430)	(1,512,994)
Beginning balance at Jun. 30, 2024	5,372,678		1,048	22,143	4,852,747	4,385,522		(2,010,500)	(1,878,282)
Increase Decrease In Stockholders Equity
Net income	155,323					155,323
Issuance of stock	1,704				1,704
Dividends declared:
Common stock	(44,614)					(44,614)
Preferred stock	(353)					(353)
Common stock purchases	(59,147)							(59,147)
Stock based compensation	(365)				(582)			217
Other comprehensive loss, net of tax	365,288								365,288
Ending balance at Sep. 30, 2024	$ 5,790,514		$ 1,048	$ 22,143	$ 4,853,869	$ 4,495,878		$ (2,069,430)	$ (1,512,994)