Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 4,592,120	$ 4,384,188	$ 3,350,454
Other comprehensive (loss) income before reclassifications	(13,180)	22,176	35,712
Amounts reclassified from other comprehensive (loss) income	2,966	2,320	1,505
Other comprehensive (loss) income, net	(10,214)	24,496	37,217
Ending balance	5,084,066	4,592,120	4,384,188
Total Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(7,718)	(32,214)	(69,431)
Ending balance	(17,932)	(7,718)	(32,214)
Unrealized Gains and Losses on AFS Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	33,290	5,822	(33,559)
Other comprehensive (loss) income before reclassifications	(23,613)	27,845	39,262
Amounts reclassified from other comprehensive (loss) income	(491)	(377)	119
Other comprehensive (loss) income, net	(24,104)	27,468	39,381
Ending balance	9,186	33,290	5,822
Unrealized Gains and Losses on Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,906)	(3,729)	(4,031)
Other comprehensive (loss) income before reclassifications	127	(2,251)	(989)
Amounts reclassified from other comprehensive (loss) income	2,447	2,074	1,291
Other comprehensive (loss) income, net	2,574	(177)	302
Ending balance	(1,332)	(3,906)	(3,729)
Defined Benefit Pension Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(37,102)	(34,307)	(31,841)
Other comprehensive (loss) income before reclassifications	10,306	(3,418)	(2,561)
Amounts reclassified from other comprehensive (loss) income	1,010	623	95
Other comprehensive (loss) income, net	11,316	(2,795)	(2,466)
Ending balance	$ (25,786)	$ (37,102)	$ (34,307)