Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net earnings		$ 120,128	$ 150,406
Other comprehensive income (loss), net of tax:
Unrealized net holding gains (losses) on securities available-for-sale arising during the period		(609,826)	(91,523)
Income tax (expense) benefit related to unrealized holding gains (losses) arising during the period		167,458	25,454
Unrealized net holding gains (losses) on securities available-for-sale, net of tax		(442,368)	(66,069)
Reclassification adjustment for net (gains) losses included in net earnings	[1]	(104)	(101)
Income tax expense (benefit) related to reclassification adjustment		29	28
Reclassification adjustment for net (gains) losses included in net earnings, net of tax		(75)	(73)
Other comprehensive (loss) income, net of tax		(442,443)	(66,142)
Comprehensive (loss) income		$ (322,315)	$ 84,264

[1] Entire amounts are recognized in "Gain on sale of securities" on the Condensed Consolidated Statements of Earnings.