Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss		$ (1,195,424)	$ 120,128
Other comprehensive income (loss), net of tax:
Unrealized net holding gains (losses) on securities available-for-sale arising during the period		67,971	(609,826)
Income tax (expense) benefit related to unrealized holding gains (losses) arising during the period		(18,828)	167,458
Unrealized net holding gains (losses) on securities available-for-sale, net of tax		49,143	(442,368)
Reclassification adjustment for net (gains) losses included in net earnings	[1]	0	(104)
Income tax expense (benefit) related to reclassification adjustment		0	29
Reclassification adjustment for net (gains) losses included in net earnings, net of tax		0	(75)
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax1		(7,884)	0
Debt Securities, Held-to-maturity, Transfer, Unrealized Gain (Loss)		(2,184)	0
Amortization of Unrealized Net Loss on Securities Transferred From Available-For-Sale to Held-to-Maturity, net of tax		5,700	0
Other comprehensive income (loss), net of tax		54,843	(442,443)
Comprehensive loss		$ (1,140,581)	$ (322,315)

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