CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statements of Comprehensive Income/(loss)
Net income/(loss)	$ 113,943	$ 274,716	$ 331,090	$ 455,702
Other comprehensive income/(loss), net of tax:
Net unrealized gains/(losses) on securities available-for-sale	16,889	(25,924)	113,696	(106,561)
Net unrealized gains/(losses) on cash flow hedges	2,844	(1,746)	17,140	(13,533)
Net unrealized gains/(losses) on pension and other postretirement plans	2,102	2,135	5,126	5,481
Other comprehensive income/(loss)	21,835	(25,535)	135,962	(114,613)
Comprehensive income/(loss)	135,778	249,181	467,052	341,089
Comprehensive income attributable to noncontrolling interest	2,883	2,883	8,555	8,555
Comprehensive income attributable to controlling interest	132,895	246,298	458,497	332,534
Income tax expense/(benefit) of items included in Other comprehensive income:
Net unrealized gains/(losses) on securities available-for-sale	5,544	(8,510)	37,321	(34,981)
Net unrealized gains/(losses) on cash flow hedges	934	(573)	5,626	(4,443)
Net unrealized gains/(losses) on pension and other postretirement plans	$ 690	$ 701	$ 1,683	$ 1,799