Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net income	$ 145,499	$ 162,118	$ 281,189	$ 339,771
Other comprehensive income (loss), before tax:
Change in net unrealized gain/loss on securities available for sale during the period	(42,111)	(206,863)	(241,186)	53,406
Change in net unrealized gain on securities transferred to held to maturity	(157)	(162)	(316)	(322)
Reclassification adjustment for net (gains) losses included in net income	0	(33)	0	(54)
Total securities available for sale and transferred securities, before tax amount	(42,268)	(207,058)	(241,502)	53,030
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)	419	870	837	1,740
Total defined-benefit post-retirement benefit plans	419	870	837	1,740
Other comprehensive income (loss), before tax	(41,849)	(206,188)	(240,665)	54,770
Deferred tax expense (benefit)	(8,788)	(43,299)	(50,540)	11,503
Other comprehensive income (loss), net of tax	(33,061)	(162,889)	(190,125)	43,267
Comprehensive income (loss)	$ 112,438	$ (771)	$ 91,064	$ 383,038