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
Net income		158,979					158,979
Issuance of stock		1,567				1,567
Dividends declared:
Common stock	[1]	(39,586)					(39,586)
Preferred stock		(353)					(353)
Common stock purchases		(2,970)							(2,970)
Stock based compensation		7,808				59			7,749
Other comprehensive loss, net of tax		223,103								223,103
Ending balance at Mar. 31, 2023		4,470,725		1,047	22,143	4,792,619	3,982,140		(2,025,399)	(2,301,825)
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		103,283					103,283
Issuance of stock		1,799				1,799
Dividends declared:
Common stock	[1]	(44,751)					(44,751)
Preferred stock		(353)					(353)
Common stock purchases		(3,576)							(3,576)
Stock based compensation		11,614				2,268			9,346
Other comprehensive loss, net of tax		(37,655)								(37,655)
Ending balance at Mar. 31, 2024		$ 5,177,314		$ 1,048	$ 22,143	$ 4,847,466	$ 4,253,030		$ (2,013,187)	$ (1,933,186)

[1] Dividends declared per common share during the quarter   ended March 31, 2024 - $ 0.62   (2023 - $ 0.55 ).