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		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 8,999,435	$ 7,929,465	$ 8,899,202	$ 7,723,054
Net unrealized gains (losses) arising during the period	(25,513)	27,868	(69,664)	110,558
Amounts reclassified from AOCI	(53)	4,767	1,488	12,322
Other comprehensive (loss) income	(25,566)	32,635	(68,176)	122,880
Ending balance	9,245,929	8,201,767	9,245,929	8,201,767
Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(383,752)	(482,175)	(353,232)	(542,152)
Net unrealized gains (losses) arising during the period	(13,052)	14,926	(45,524)	72,303
Amounts reclassified from AOCI	480	683	2,432	3,283
Other comprehensive (loss) income	(12,572)	15,609	(43,092)	75,586
Ending balance	(396,324)	(466,566)	(396,324)	(466,566)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	12,033	10,493	28,209	(20,787)
Net unrealized gains (losses) arising during the period	(16,137)	14,045	(31,902)	40,370
Amounts reclassified from AOCI	(533)	4,084	(944)	9,039
Other comprehensive (loss) income	(16,670)	18,129	(32,846)	49,409
Ending balance	(4,637)	28,622	(4,637)	28,622
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(16,501)	(23,333)	(20,587)	(22,321)
Net unrealized gains (losses) arising during the period	3,676	(1,103)	7,762	(2,115)
Amounts reclassified from AOCI	0	0	0	0
Other comprehensive (loss) income	3,676	(1,103)	7,762	(2,115)
Ending balance	(12,825)	(24,436)	(12,825)	(24,436)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(388,220)	(495,015)	(345,610)	(585,260)
Other comprehensive (loss) income	(25,566)	32,635	(68,176)	122,880
Ending balance	$ (413,786)	$ (462,380)	$ (413,786)	$ (462,380)