Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Surplus	Accumulated Other Comprehensive (Loss) Income	Undivided Profits
Balance at Dec. 31, 2020	$ 2,976,656	$ 767	$ 1,081	$ 2,014,076	$ 59,726	$ 901,006
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	(29,482)				(96,902)	67,420
Stock issued for employee stock purchase plan	1,170		1	1,169
Stock-based compensation plans, net	5,024		2	5,022
Stock repurchases	(3,080)		(1)	(3,079)
Dividends on preferred stock	(13)					(13)
Dividends on common stock	(19,500)					(19,500)
Balance at Mar. 31, 2021	2,930,775	767	1,083	2,017,188	(37,176)	948,913
Balance at Dec. 31, 2021	3,248,841	0	1,127	2,164,989	(10,545)	1,093,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	(251,321)				(316,416)	65,095
Stock issued for employee stock purchase plan	1,151		1	1,150
Stock-based compensation plans, net	366		2	364
Stock repurchases	(16,055)		(5)	(16,050)
Dividends on common stock	(21,375)					(21,375)
Balance at Mar. 31, 2022	$ 2,961,607	$ 0	$ 1,125	$ 2,150,453	$ (326,961)	$ 1,136,990