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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Surplus	Accumulated Other Comprehensive (Loss) Income	Undivided Profits	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Undivided Profits
Balance at Dec. 31, 2019	$ 2,988,924	$ 767	$ 1,136	$ 2,117,282	$ 20,891	$ 848,848	$ (128,101)	$ (128,101)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	94,575				17,339	77,236
Stock issued for employee stock purchase plan	956		1	955
Stock-based compensation plans, net	1,443		2	1,441
Stock repurchases	(93,307)		(49)	(93,258)
Dividends on preferred stock	(13)					(13)
Dividends on common stock	(19,077)					(19,077)
Balance at Mar. 31, 2020	2,845,400	767	1,090	2,026,420	38,230	778,893
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