Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Preferred Stock
Beginning Period Balance at Dec. 31, 2020	$ 3,594,951,000	$ 1,207,000	$ 3,100,633,000	$ 409,391,000	$ (88,803,000)	$ 172,523,000
Shares outstanding, beginning balance (shares) at Dec. 31, 2020		118,414,853
Stockholders' Equity Disclosure [Rollforward]
Net earnings	150,406,000			150,406,000
Other comprehensive loss, net of tax	(66,142,000)					(66,142,000)
Restricted stock awarded and earned compensation, net of shares forfeited (shares)		743,444
Restricted stock awarded and earned stock compensation, net of shares forfeited	6,417,000	$ 8,000	6,409,000
Restricted stock surrendered (shares)		(52,655)
Restricted stock surrendered	(1,908,000)				(1,908,000)
Cash dividends paid	(29,587,000)		(29,587,000)
Shares outstanding, ending balance (shares) at Mar. 31, 2021		119,105,642
Ending Period Balance at Mar. 31, 2021	3,654,137,000	$ 1,215,000	3,077,455,000	559,797,000	(90,711,000)	106,381,000
Beginning Period Balance at Dec. 31, 2020	3,594,951,000	$ 1,207,000	3,100,633,000	409,391,000	(88,803,000)	172,523,000
Shares outstanding, beginning balance (shares) at Dec. 31, 2020		118,414,853
Stockholders' Equity Disclosure [Rollforward]
Net earnings	470,914,000
Shares outstanding, ending balance (shares) at Sep. 30, 2021		119,579,566
Ending Period Balance at Sep. 30, 2021	$ 3,918,434,000	$ 1,221,000	3,035,052,000	880,305,000	(97,003,000)	98,859,000
Common stock dividends declared per share (usd per share)	$ 0.25
Beginning Period Balance at Mar. 31, 2021	$ 3,654,137,000	$ 1,215,000	3,077,455,000	559,797,000	(90,711,000)	106,381,000
Shares outstanding, beginning balance (shares) at Mar. 31, 2021		119,105,642
Stockholders' Equity Disclosure [Rollforward]
Net earnings	180,512,000			180,512,000
Other comprehensive loss, net of tax	39,135,000					39,135,000
Restricted stock awarded and earned compensation, net of shares forfeited (shares)		586,271
Restricted stock awarded and earned stock compensation, net of shares forfeited	8,989,000	$ 6,000	8,983,000
Restricted stock surrendered (shares)		(136,811)
Restricted stock surrendered	(6,176,000)				(6,176,000)
Cash dividends paid	(29,916,000)		(29,916,000)
Shares outstanding, ending balance (shares) at Jun. 30, 2021		119,555,102
Ending Period Balance at Jun. 30, 2021	$ 3,846,681,000	$ 1,221,000	3,056,522,000	740,309,000	(96,887,000)	145,516,000
Common stock dividends declared per share (usd per share)	$ 0.25
Stockholders' Equity Disclosure [Rollforward]
Net earnings	$ 139,996,000			139,996,000
Other comprehensive loss, net of tax	(46,657,000)					(46,657,000)
Restricted stock awarded and earned compensation, net of shares forfeited (shares)		27,206
Restricted stock awarded and earned stock compensation, net of shares forfeited	8,501,000	$ 0	8,501,000
Restricted stock surrendered (shares)		(2,742)
Restricted stock surrendered	(116,000)				(116,000)
Common stock repurchased under Stock Repurchase Program	(29,971,000)
Cash dividends paid			(29,971,000)
Shares outstanding, ending balance (shares) at Sep. 30, 2021		119,579,566
Ending Period Balance at Sep. 30, 2021	3,918,434,000	$ 1,221,000	3,035,052,000	880,305,000	(97,003,000)	98,859,000
Beginning Period Balance at Dec. 31, 2021	3,999,630,000	$ 1,221,000	3,013,399,000	1,016,350,000	(97,308,000)	65,968,000	$ 0
Shares outstanding, beginning balance (shares) at Dec. 31, 2021		119,584,854
Stockholders' Equity Disclosure [Rollforward]
Net earnings	120,128,000			120,128,000
Other comprehensive loss, net of tax	(442,443,000)					(442,443,000)
Restricted stock awarded and earned compensation, net of shares forfeited (shares)		109,466
Restricted stock awarded and earned stock compensation, net of shares forfeited	7,557,000	$ 1,000	7,556,000
Restricted stock surrendered (shares)		(92,554)
Restricted stock surrendered	(4,481,000)				(4,481,000)
Cash dividends paid	(29,796,000)		(29,796,000)
Shares outstanding, ending balance (shares) at Mar. 31, 2022		119,601,766
Ending Period Balance at Mar. 31, 2022	3,650,595,000	$ 1,222,000	2,991,159,000	1,136,478,000	(101,789,000)	(376,475,000)	0
Beginning Period Balance at Dec. 31, 2021	3,999,630,000	$ 1,221,000	3,013,399,000	1,016,350,000	(97,308,000)	65,968,000	0
Shares outstanding, beginning balance (shares) at Dec. 31, 2021		119,584,854
Stockholders' Equity Disclosure [Rollforward]
Net earnings	374,104,000
Shares outstanding, ending balance (shares) at Sep. 30, 2022		120,314,023
Ending Period Balance at Sep. 30, 2022	$ 3,875,945,000	$ 1,231,000	2,950,088,000	1,381,062,000	(106,738,000)	(848,214,000)	498,516,000
Common stock dividends declared per share (usd per share)	$ 0.25
Beginning Period Balance at Mar. 31, 2022	$ 3,650,595,000	$ 1,222,000	2,991,159,000	1,136,478,000	(101,789,000)	(376,475,000)	0
Shares outstanding, beginning balance (shares) at Mar. 31, 2022		119,601,766
Stockholders' Equity Disclosure [Rollforward]
Net earnings	122,360,000			122,360,000
Other comprehensive loss, net of tax	(268,275,000)					(268,275,000)
Stock Issued During Period, Value, New Issues	498,516,000						498,516,000
Restricted stock awarded and earned compensation, net of shares forfeited (shares)		822,258
Restricted stock awarded and earned stock compensation, net of shares forfeited	9,698,000	$ 8,000	9,690,000
Restricted stock surrendered (shares)		(136,000)
Restricted stock surrendered	(4,289,000)				(4,289,000)
Cash dividends paid	(30,202,000)		(30,202,000)
Shares outstanding, ending balance (shares) at Jun. 30, 2022		120,288,024
Ending Period Balance at Jun. 30, 2022	$ 3,978,403,000	$ 1,230,000	2,970,647,000	1,258,838,000	(106,078,000)	(644,750,000)	498,516,000
Preferred stock dividends declared per share (usd per share)	$ 0.46
Common stock dividends declared per share (usd per share)	$ 0.25
Stockholders' Equity Disclosure [Rollforward]
Net earnings	$ 131,616,000			131,616,000
Other comprehensive loss, net of tax	(203,464,000)					(203,464,000)
Stock Issued During Period, Value, New Issues	498,500,000
Restricted stock awarded and earned compensation, net of shares forfeited (shares)		51,094
Restricted stock awarded and earned stock compensation, net of shares forfeited	9,651,000	$ 1,000	9,650,000
Restricted stock surrendered (shares)		(25,095)
Restricted stock surrendered	(660,000)				(660,000)
Dividends, Preferred Stock	(9,392,000)			(9,392,000)
Cash dividends paid	(30,209,000)		(30,209,000)
Shares outstanding, ending balance (shares) at Sep. 30, 2022		120,314,023
Ending Period Balance at Sep. 30, 2022	$ 3,875,945,000	$ 1,231,000	$ 2,950,088,000	$ 1,381,062,000	$ (106,738,000)	$ (848,214,000)	$ 498,516,000