Accumulated Other Comprehensive Income (Loss) - Schedule of the Changes in Components of Accumulated Other Comprehensive Income (Loss) Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 8,899,202	$ 7,723,054
Net unrealized gains (losses) arising during the period	(44,151)	82,690
Amounts reclassified from AOCI	1,541	7,555
Other comprehensive (loss) income	(42,610)	90,245
Ending balance	8,999,435	7,929,465
Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(353,232)	(542,152)
Net unrealized gains (losses) arising during the period	(32,472)	57,377
Amounts reclassified from AOCI	1,952	2,600
Other comprehensive (loss) income	(30,520)	59,977
Ending balance	(383,752)	(482,175)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	28,209	(20,787)
Net unrealized gains (losses) arising during the period	(15,765)	26,325
Amounts reclassified from AOCI	(411)	4,955
Other comprehensive (loss) income	(16,176)	31,280
Ending balance	12,033	10,493
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(20,587)	(22,321)
Net unrealized gains (losses) arising during the period	4,086	(1,012)
Amounts reclassified from AOCI	0	0
Other comprehensive (loss) income	4,086	(1,012)
Ending balance	(16,501)	(23,333)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(345,610)	(585,260)
Other comprehensive (loss) income	(42,610)	90,245
Ending balance	$ (388,220)	$ (495,015)