Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 182,311	$ 94,035	$ 165,564	$ 202,113
Other comprehensive (loss) income, net of tax:
Investment securities available-for-sale	(205,273)	(1,473)	(450,152)	(31,826)
Derivative instruments	(308)	(1,652)	(8,152)	(6,024)
Defined benefit pension and other postretirement benefit plans	(28)	741	(448)	1,484
Other comprehensive (loss), net of tax	(205,609)	(2,384)	(458,752)	(36,366)
Comprehensive (loss) income	$ (23,298)	$ 91,651	$ (293,188)	$ 165,747