Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 234,968	$ 182,311	$ 455,972	$ 165,564
Other comprehensive (loss) income, net of tax:
Investment securities available-for-sale	(85,037)	(205,273)	(13,419)	(450,152)
Derivative instruments	(47,523)	(308)	(26,149)	(8,152)
Defined benefit pension and other postretirement benefit plans	1,757	(28)	5,705	(448)
Other comprehensive (loss), net of tax	(130,803)	(205,609)	(33,863)	(458,752)
Comprehensive income (loss)	$ 104,165	$ (23,298)	$ 422,109	$ (293,188)