CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statements of Comprehensive Income/(loss)
Net income/(loss)	$ 113,742	$ 85,992	$ 217,147	$ 180,986
Other comprehensive income/(loss), net of tax:
Net unrealized gains/(losses) on securities available-for-sale	48,192	(21,094)	96,807	(80,637)
Net unrealized gains/(losses) on cash flow hedges	8,909	(2,994)	14,296	(11,787)
Net unrealized gains/(losses) on pension and other postretirement plans	1,561	2,059	3,024	3,346
Other comprehensive income/(loss)	58,662	(22,029)	114,127	(89,078)
Comprehensive income/(loss)	172,404	63,963	331,274	91,908
Comprehensive income attributable to noncontrolling interest	2,852	2,852	5,672	5,672
Comprehensive income attributable to controlling interest	169,552	61,111	325,602	86,236
Income tax expense/(benefit) of items included in Other comprehensive income:
Net unrealized gains/(losses) on securities available-for-sale	15,819	(6,924)	31,777	(26,471)
Net unrealized gains/(losses) on cash flow hedges	2,924	(983)	4,692	(3,870)
Net unrealized gains/(losses) on pension and other postretirement plans	$ 513	$ 676	$ 993	$ 1,098