Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 5,084,066	$ 4,592,120	$ 4,384,188
Other comprehensive (loss) income before reclassifications	(146,794)	(13,180)	22,176
Amounts reclassified from other comprehensive (loss) income	724	2,966	2,320
Other comprehensive (loss) income, net	(146,070)	(10,214)	24,496
Ending balance	6,400,802	5,084,066	4,592,120
Total Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(17,932)	(7,718)	(32,214)
Ending balance	(164,002)	(17,932)	(7,718)
Unrealized Gains and Losses on AFS Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	9,186	33,290	5,822
Other comprehensive (loss) income before reclassifications	(136,981)	(23,613)	27,845
Amounts reclassified from other comprehensive (loss) income	(23)	(491)	(377)
Other comprehensive (loss) income, net	(137,004)	(24,104)	27,468
Ending balance	(127,818)	9,186	33,290
Unrealized Gains and Losses on Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,332)	(3,906)	(3,729)
Other comprehensive (loss) income before reclassifications	3,362	127	(2,251)
Amounts reclassified from other comprehensive (loss) income	203	2,447	2,074
Other comprehensive (loss) income, net	3,565	2,574	(177)
Ending balance	2,233	(1,332)	(3,906)
Defined benefit pension and postretirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(25,786)	(37,102)	(34,307)
Other comprehensive (loss) income before reclassifications	(13,175)	10,306	(3,418)
Amounts reclassified from other comprehensive (loss) income	544	1,010	623
Other comprehensive (loss) income, net	(12,631)	11,316	(2,795)
Ending balance	$ (38,417)	$ (25,786)	$ (37,102)