Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net income	$ 135,690	$ 177,653
Other comprehensive income (loss), before tax:
Change in net unrealized gain/loss on securities available for sale during the period	(199,075)	260,269
Change in net unrealized gain on securities transferred to held to maturity	(159)	(160)
Reclassification adjustment for net (gains) losses included in net income	0	(21)
Total securities available for sale and transferred securities, before tax amount	(199,234)	260,088
Defined-benefit post-retirement benefit plans:
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)	418	870
Total defined-benefit post-retirement benefit plans	418	870
Other comprehensive income (loss), before tax	(198,816)	260,958
Deferred tax expense (benefit)	(41,752)	54,802
Other comprehensive income (loss), net of tax	(157,064)	206,156
Comprehensive income (loss)	$ (21,374)	$ 383,809