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, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 7,723,054	$ 6,950,834	$ 5,984,612
Net unrealized gains (losses) arising during the period	213,510	(38,127)	72,597
Amounts reclassified from AOCI	26,140	73,463	72,436
Other comprehensive income	239,650	35,336	145,033
Ending balance	8,899,202	7,723,054	6,950,834
Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(542,152)	(601,881)	(694,815)
Net unrealized gains (losses) arising during the period	177,668	50,302	76,930
Amounts reclassified from AOCI	11,252	9,427	16,004
Other comprehensive income	188,920	59,729	92,934
Ending balance	(353,232)	(542,152)	(601,881)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(20,787)	2,624	(49,531)
Net unrealized gains (losses) arising during the period	34,108	(87,447)	(4,277)
Amounts reclassified from AOCI	14,888	64,036	56,432
Other comprehensive income	48,996	(23,411)	52,155
Ending balance	28,209	(20,787)	2,624
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(22,321)	(21,339)	(21,283)
Net unrealized gains (losses) arising during the period	1,734	(982)	(56)
Amounts reclassified from AOCI	0	0	0
Other comprehensive income	1,734	(982)	(56)
Ending balance	(20,587)	(22,321)	(21,339)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(585,260)	(620,596)	(765,629)
Other comprehensive income	239,650	35,336	145,033
Ending balance	$ (345,610)	$ (585,260)	$ (620,596)