Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (loss)		$ 606,959	$ (1,237,574)	$ 468,636
arising during the year		(146,066)	142,696	143,019
(losses) arising during the year		40,677	(39,335)	(40,058)
net of tax		(105,389)	103,361	102,961
Reclassification adjustment for net gains included in net earnings (1)	[1]	(1,615)	(13,171)	(25,445)
Income tax expense related to reclassification adjustment		449	3,675	7,217
net earnings, net of tax		(1,166)	(9,496)	(18,228)
Other comprehensive income (loss), net of tax		(106,555)	93,865	84,733
Comprehensive income (loss)		$ 500,404	$ (1,143,709)	$ 553,369

[1] Entire amount recognized in "Gain on sale of securities" on the Consolidated Statements of Earnings (Loss).