Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net earnings (loss)		$ 126,888	$ (1,899,137)	$ 423,613
arising during the year		11,987	16,525	(952,391)
(losses) arising during the year		(3,057)	(3,938)	262,049
net of tax		8,930	12,587	(690,342)
Reclassification adjustment for net losses included in net earnings (1)	[1]	60,400	442,413	50,321
Income tax benefit related to reclassification adjustment		(17,143)	(120,797)	(12,397)
net earnings, net of tax		43,257	321,616	37,924
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax1		0	0	(218,326)
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax1		32,815	31,895	18,191
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), Tax		(9,312)	(8,835)	(4,318)
Other comprehensive income (loss), net of tax		77,334	358,789	(856,871)
Comprehensive income (loss)		204,222	(1,540,348)	(433,258)
Amortization of Unrealized Net Loss on Securities Transferred From Available-For-Sale to Held-to-Maturity, net of tax		23,503	23,060	13,873
Change In Fair Value of Credit-linked Notes		(2,589)	7,794	0
Income Tax Expense Related to Change In Fair Value of Credit-linked Notes		760	(2,211)	0
Change In Fair Value of Credit-linked Notes, Net of Tax		(1,829)	5,583	0
Unrealized Gain (Loss) on Price Risk Cash Flow Derivatives, before Tax		4,897	(5,714)	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax		(1,424)	(1,657)	0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments		$ 3,473	$ (4,057)	$ 0

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