Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 6,701,391	$ 6,400,802	$ 5,084,066
Other comprehensive (loss) income before reclassifications	(7,788)	17,635	(146,794)
Amounts reclassified to earnings	(1,090)	(89)	724
Other comprehensive (loss) income, net	(8,878)	17,546	(146,070)
Ending balance	7,435,127	6,701,391	6,400,802
Total Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(146,456)	(164,002)	(17,932)
Ending balance	(155,334)	(146,456)	(164,002)
Unrealized Gains and Losses on AFS Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(115,502)	(127,818)	9,186
Other comprehensive (loss) income before reclassifications	(18,397)	12,950	(136,981)
Amounts reclassified to earnings	1	(634)	(23)
Other comprehensive (loss) income, net	(18,396)	12,316	(137,004)
Ending balance	(133,898)	(115,502)	(127,818)
Unrealized Gains and Losses on Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,114	2,233	(1,332)
Other comprehensive (loss) income before reclassifications	0	(757)	3,362
Amounts reclassified to earnings	(869)	638	203
Other comprehensive (loss) income, net	(869)	(119)	3,565
Ending balance	1,245	2,114	2,233
Defined benefit pension and postretirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(33,068)	(38,417)	(25,786)
Other comprehensive (loss) income before reclassifications	10,609	5,442	(13,175)
Amounts reclassified to earnings	(222)	(93)	544
Other comprehensive (loss) income, net	10,387	5,349	(12,631)
Ending balance	$ (22,681)	$ (33,068)	$ (38,417)