Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 6,204,913	$ 4,737,807	$ 5,084,066	$ 4,592,120
Other comprehensive (loss) gain before reclassification	(57,327)		(148,293)
Amounts reclassified from other comprehensive (loss) income	107		668
Other comprehensive (loss) income, net	(57,220)	(3,640)	(147,625)	(13,657)
Ending balance	6,273,829	4,822,498	6,273,829	4,822,498
Total Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(108,337)	(17,735)	(17,932)	(7,718)
Ending balance	(165,557)	$ (21,375)	(165,557)	$ (21,375)
Unrealized Gains and Losses on Available for Sale (AFS) Securities
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(81,985)		9,186
Other comprehensive (loss) gain before reclassification	(57,242)		(148,403)
Amounts reclassified from other comprehensive (loss) income	(12)		(22)
Other comprehensive (loss) income, net	(57,254)		(148,425)
Ending balance	(139,239)		(139,239)
Unrealized Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(831)		(1,332)
Other comprehensive (loss) gain before reclassification	(85)		110
Amounts reclassified from other comprehensive (loss) income	(13)		293
Other comprehensive (loss) income, net	(98)		403
Ending balance	(929)		(929)
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(25,521)		(25,786)
Other comprehensive (loss) gain before reclassification	0		0
Amounts reclassified from other comprehensive (loss) income	132		397
Other comprehensive (loss) income, net	132		397
Ending balance	$ (25,389)		$ (25,389)