Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net earnings (loss)		$ 228,973	$ 126,888	$ (1,899,137)
Unrealized net holding gains on securities available-for-sale arising during the year		88,224	11,987	16,525
Income tax expense related to net unrealized holding gains arising during the year		(24,777)	(3,057)	(3,938)
Unrealized net holding gains on securities available-for-sale, net of tax		63,447	8,930	12,587
Reclassification adjustment for net losses included in net earnings (1)	[1]	0	60,400	442,413
Income tax benefit related to reclassification adjustment		0	(17,143)	(120,797)
Reclassification adjustment for net losses included in net earnings, net of tax		0	43,257	321,616
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax1		33,938	32,815	31,895
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), Tax		(9,492)	(9,312)	(8,835)
Other comprehensive income, net of tax		85,519	77,334	358,789
Comprehensive income (loss)		314,492	204,222	(1,540,348)
Amortization of Unrealized Net Loss on Securities Transferred From Available-For-Sale to Held-to-Maturity, net of tax		24,446	23,503	23,060
Change In Fair Value of Credit-linked Notes		868	(2,589)	7,794
Income Tax Expense Related to Change In Fair Value of Credit-linked Notes		(209)	760	(2,211)
Change In Fair Value of Credit-linked Notes, Net of Tax		659	(1,829)	5,583
Unrealized Gain (Loss) on Price Risk Cash Flow Derivatives, before Tax		(4,186)	4,897	(5,714)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax		1,153	(1,424)	1,657
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (Deprecated 2025)		$ (3,033)	$ 3,473	$ (4,057)

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