Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Consolidated Statements of Comprehensive Income
Net income	$ 38,865	$ 69,924
Other comprehensive income (loss), net of tax:
Net change in pensions and other benefits	(96)
Net change in investment securities	35,974	53,441
Other comprehensive income	35,878	53,441
Total comprehensive income	$ 74,743	$ 123,365