Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Dividends declared per share (usd per share)		$ 1.00
Shares, Outstanding at Dec. 31, 2018			123,189,833
Total stockholders' equity at Dec. 31, 2018		$ 4,825,588	$ 1,251	$ 3,722,723	$ 1,182,674	$ (74,985)	$ (6,075)
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change of Income Taxes	[1]	938			938
Net Income		468,636			468,636
Other comprehensive loss		84,733					84,733
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares			798,248
net of shares forfeited		26,815	$ 8	26,807
Restricted stock surrendered, shares			(218,531)
Stock Repurchase Program		(8,449)				(8,449)
Dividend reinvestment, shares			(3,987,945)
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			$ (40)
Dividend reinvestment		(154,516)		(154,476)
Common stock, $1.00/share		(289,048)		(289,048)
Shares, Outstanding at Dec. 31, 2019			119,781,605
Total stockholders' equity at Dec. 31, 2019		$ 4,954,697	$ 1,219	3,306,006	1,652,248	(83,434)	78,658
Dividends declared per share (usd per share)		$ 1.35
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change of Income Taxes	[2]	$ (5,283)			(5,283)
Net Income		(1,237,574)			(1,237,574)
Other comprehensive loss		93,865					93,865
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares			800,537
net of shares forfeited		24,363	$ 8	24,355
Restricted stock surrendered, shares			(213,578)
Stock Repurchase Program		(5,369)				(5,369)
Dividend reinvestment, shares			(1,953,711)
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			$ (20)
Common Stock Repurchased Under Stock Repurchase Program, Amount Repurchased		(70,000)		(69,980)
Common stock, $1.00/share		(159,748)		(159,748)
Shares, Outstanding at Dec. 31, 2020			118,414,853
Total stockholders' equity at Dec. 31, 2020		$ 3,594,951	$ 1,207	3,100,633	409,391	(88,803)	172,523
Dividends declared per share (usd per share)		$ 2.40
Net Income		$ 606,959			606,959
Other comprehensive loss		(106,555)					(106,555)
Restricted stock awarded and earned stock compensation, net of shares forfeited, shares			1,369,019
net of shares forfeited		32,223	$ 14	32,209
Restricted stock surrendered, shares			(199,018)
Stock Repurchase Program		(8,505)				(8,505)
Common stock, $1.00/share		(119,443)		(119,443)
Shares, Outstanding at Dec. 31, 2021			119,584,854
Total stockholders' equity at Dec. 31, 2021		$ 3,999,630	$ 1,221	$ 3,013,399	$ 1,016,350	$ (97,308)	$ 65,968

[1] Impact due to adoption on January 1, 2019 of ASU 2016-02, "Leases (Topic 842)," and the related amendments.

[2] Impact due to adoption on January 1, 2020 of ASU 2016-13, "Financial Instruments - Credit Losses (ASC 326): Measurement of Credit Losses on Financial Instruments," and the related amendments, commonly referred to as CECL.