Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 6,950,834	$ 5,984,612
Other comprehensive (loss) income	(42,137)	85,635
Ending balance	7,023,232	6,309,331
Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(601,881)	(694,815)
Net unrealized (losses) gains arising during the period	(2,282)	44,275
Amounts reclassified from AOCI	2,653	9,806
Other comprehensive (loss) income	371	54,081
Ending balance	(601,510)	(640,734)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,624	(49,531)
Net unrealized (losses) gains arising during the period	(63,662)	21,086
Amounts reclassified from AOCI	17,332	7,527
Other comprehensive (loss) income	(46,330)	28,613
Ending balance	(43,706)	(20,918)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(21,339)	(21,283)
Net unrealized (losses) gains arising during the period	3,822	2,941
Amounts reclassified from AOCI	0	0
Other comprehensive (loss) income	3,822	2,941
Ending balance	(17,517)	(18,342)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(620,596)	(765,629)
Net unrealized (losses) gains arising during the period	(62,122)	68,302
Amounts reclassified from AOCI	19,985	17,333
Other comprehensive (loss) income	(42,137)	85,635
Ending balance	$ (662,733)	$ (679,994)