Accumulated Other Comprehensive (Loss) Income - Schedule Of The Changes In Components Of Accumulated Other Comprehensive Income (Loss) Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 6,950,834	$ 5,984,612	$ 5,837,218
Other comprehensive income (loss)	35,336	145,033	(675,248)
Ending balance	7,723,054	6,950,834	5,984,612
Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(601,881)	(694,815)	(85,703)
Net unrealized gains (losses) arising during the period	50,302	76,930	(620,870)
Amounts reclassified from AOCI	9,427	16,004	11,758
Other comprehensive income (loss)	59,729	92,934	(609,112)
Ending balance	(542,152)	(601,881)	(694,815)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,624	(49,531)	257
Net unrealized gains (losses) arising during the period	(87,447)	(4,277)	(52,623)
Amounts reclassified from AOCI	64,036	56,432	2,835
Other comprehensive income (loss)	(23,411)	52,155	(49,788)
Ending balance	(20,787)	2,624	(49,531)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(21,339)	(21,283)	(4,935)
Net unrealized gains (losses) arising during the period	(982)	(56)	(16,348)
Amounts reclassified from AOCI	0	0	0
Other comprehensive income (loss)	(982)	(56)	(16,348)
Ending balance	(22,321)	(21,339)	(21,283)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(620,596)	(765,629)	(90,381)
Net unrealized gains (losses) arising during the period	(38,127)	72,597	(689,841)
Amounts reclassified from AOCI	73,463	72,436	14,593
Other comprehensive income (loss)	35,336	145,033	(675,248)
Ending balance	$ (585,260)	$ (620,596)	$ (765,629)