Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net income	$ 54,753	$ 116,496
Other comprehensive income (loss), before tax:
Change in net unrealized gain/loss on securities available for sale during the period	230,118	198,146
Change in net unrealized gain on securities transferred to held to maturity	(377)	(344)
Reclassification adjustment for net (gains) losses included in net income	(108,989)	0
Total securities available for sale and transferred securities, before tax amount	120,752	197,802
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)	1,330	1,406
Total defined-benefit post-retirement benefit plans	1,330	1,406
Other comprehensive income (loss), before tax	122,082	199,208
Deferred tax expense (benefit)	25,637	41,834
Other comprehensive income (loss), net of tax	96,445	157,374
Comprehensive income (loss)	$ 151,198	$ 273,870