Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net income	$ 99,102	$ 116,015
Other comprehensive income (loss), before tax:
Change in net unrealized gain/loss on securities available for sale during the period	(910,795)	(159,779)
Change in net unrealized gain on securities transferred to held to maturity	(209)	(259)
Reclassification adjustment for net (gains) losses included in net income	0	0
Total securities available for sale and transferred securities, before tax amount	(911,004)	(160,038)
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)	741	1,529
Total defined-benefit post-retirement benefit plans	741	1,529
Other comprehensive income (loss), before tax	(910,263)	(158,509)
Deferred tax expense (benefit)	(191,155)	(33,287)
Other comprehensive income (loss), net of tax	(719,108)	(125,222)
Comprehensive income (loss)	$ (620,006)	$ (9,207)