Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net loss		$ (197,414)	$ 122,360	$ (1,392,838)	$ 242,488
Other comprehensive (loss) income, net of tax:
Unrealized net holding gains (losses) on securities available-for-sale arising during the period		(64,145)	(72,572)	3,826	(682,398)
Income tax (expense) benefit related to unrealized holding gains (losses) arising during the period		17,768	19,928	(1,060)	187,386
Unrealized net holding gains (losses) on securities available-for-sale, net of tax		(46,377)	(52,644)	2,766	(495,012)
Reclassification adjustment for net (gains) losses included in net earnings	[1]	0	1,209	0	1,105
Income tax expense (benefit) related to reclassification adjustment		0	(332)	0	(303)
Reclassification adjustment for net (gains) losses included in net earnings, net of tax		0	877	0	802
Amortization of Unrealized Net Loss on Securities Transferred From Available-For-Sale to Held-to-Maturity, net of tax		0	(218,326)	0	(218,326)
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax1		(7,877)	(2,507)	(15,761)	(2,507)
Debt Securities, Held-to-maturity, Transfer, Unrealized Gain (Loss)		(2,182)	(689)	(4,366)	(689)
Amortization of Unrealized Net Loss on Securities Transferred From Available-For-Sale to Held-to-Maturity, net of tax		5,695	1,818	11,395	1,818
Change In Fair Value of Credit-linked Notes		4,057	0	4,057	0
Income Tax Expense Related to Change In Fair Value of Credit-linked Notes		(1,118)	0	(1,118)	0
Change In Fair Value of Credit-linked Notes, Net of Tax		2,939	0	2,939	0
Other comprehensive (loss) income, net of tax		(37,743)	(268,275)	17,100	(710,718)
Comprehensive loss		$ (235,157)	$ (145,915)	$ (1,375,738)	$ (468,230)

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