CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 185,754	$ 284,392	$ 264,394
Other comprehensive income (loss), net of tax:
Net change in pensions and other benefits	(3,655)	297	2,960
Net change in investment securities	67,008	100,149	(14,259)
Net change in cash flow derivative hedges			(4,445)
Other comprehensive income (loss), Net of tax	63,353	100,446	(15,744)
Total comprehensive income	$ 249,107	$ 384,838	$ 248,650