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, 2025	Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 7,723,054	$ 6,950,834
Net unrealized gains (losses) arising during the period	82,690	(62,122)
Amounts reclassified from AOCI	7,555	19,985
Other comprehensive income (loss)	90,245	(42,137)
Ending balance	7,929,465	7,023,232
Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(542,152)	(601,881)
Net unrealized gains (losses) arising during the period	57,377	(2,282)
Amounts reclassified from AOCI	2,600	2,653
Other comprehensive income (loss)	59,977	371
Ending balance	(482,175)	(601,510)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(20,787)	2,624
Net unrealized gains (losses) arising during the period	26,325	(63,662)
Amounts reclassified from AOCI	4,955	17,332
Other comprehensive income (loss)	31,280	(46,330)
Ending balance	10,493	(43,706)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(22,321)	(21,339)
Net unrealized gains (losses) arising during the period	(1,012)	3,822
Amounts reclassified from AOCI	0	0
Other comprehensive income (loss)	(1,012)	3,822
Ending balance	(23,333)	(17,517)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(585,260)	(620,596)
Other comprehensive income (loss)	90,245	(42,137)
Ending balance	$ (495,015)	$ (662,733)