Accumulated Other Comprehensive (Loss) Income - Schedule Of The Changes In Components Of Accumulated Other Comprehensive Income (Loss) Balances (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 7,215,114	$ 6,461,697	$ 6,950,834	$ 5,984,612
Other comprehensive income (loss)	216,869	(93,445)	183,292	(109,748)
Ending balance	7,664,539	6,596,706	7,664,539	6,596,706
Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(591,286)	(681,536)	(601,881)	(694,815)
Net unrealized gains (losses) arising during the period	132,130	(72,691)	138,621	(72,034)
Amounts reclassified from AOCI	2,663	2,870	6,767	15,492
Other comprehensive income (loss)	134,793	(69,821)	145,388	(56,542)
Ending balance	(456,493)	(751,357)	(456,493)	(751,357)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(44,059)	(74,805)	2,624	(49,531)
Net unrealized gains (losses) arising during the period	66,105	(44,347)	(15,235)	(91,468)
Amounts reclassified from AOCI	17,097	17,013	51,754	38,860
Other comprehensive income (loss)	83,202	(27,334)	36,519	(52,608)
Ending balance	39,143	(102,139)	39,143	(102,139)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(18,828)	(25,591)	(21,339)	(21,283)
Net unrealized gains (losses) arising during the period	(1,126)	3,710	1,385	(598)
Amounts reclassified from AOCI	0	0	0	0
Other comprehensive income (loss)	(1,126)	3,710	1,385	(598)
Ending balance	(19,954)	(21,881)	(19,954)	(21,881)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(654,173)	(781,932)	(620,596)	(765,629)
Net unrealized gains (losses) arising during the period	197,109	(113,328)	124,771	(164,100)
Amounts reclassified from AOCI	19,760	19,883	58,521	54,352
Other comprehensive income (loss)	216,869	(93,445)	183,292	(109,748)
Ending balance	$ (437,304)	$ (875,377)	$ (437,304)	$ (875,377)