Accumulated Other Comprehensive (Loss) Income - Schedule Of Components Of Other Comprehensive Income (Loss), Reclassifications To Net Income And The Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Before-Tax
Net change	$ 308,347	$ (134,036)	$ 259,725	$ (154,395)
Tax Effect
Net change	(91,478)	40,591	(76,433)	44,647
Net-of-Tax
Other comprehensive income (loss)	216,869	(93,445)	183,292	(109,748)
Debt Securities
Before-Tax
Net unrealized gains (losses) on AFS debt securities arising during the period	187,578	(103,183)	196,717	(102,262)
Net realized (gains) losses on AFS debt securities reclassified into net income	(145)	0	(1,979)	10,000
Amortization of unrealized losses on transferred securities	3,926	4,075	11,587	11,994
Net change	191,359	(99,108)	206,325	(80,268)
Tax Effect
Net unrealized gains (losses) on AFS debt securities arising during the period	(55,448)	30,492	(58,096)	30,228
Net realized (gains) losses on AFS debt securities reclassified into net income	43	0	585	(2,956)
Amortization of unrealized losses on transferred securities	(1,161)	(1,205)	(3,426)	(3,546)
Net change	(56,566)	29,287	(60,937)	23,726
Net-of-Tax
Net unrealized gains (losses) on AFS debt securities arising during the period	132,130	(72,691)	138,621	(72,034)
Net realized (gains) losses on AFS debt securities reclassified into net income	(102)	0	(1,394)	7,044
Amortization of unrealized losses on transferred securities	2,765	2,870	8,161	8,448
Net unrealized gains (losses) arising during the period	132,130	(72,691)	138,621	(72,034)
Net realized losses reclassified into net income	2,663	2,870	6,767	15,492
Other comprehensive income (loss)	134,793	(69,821)	145,388	(56,542)
Cash Flow Hedges
Before-Tax
Net unrealized gains (losses) arising during the period	93,842	(62,715)	(21,629)	(129,329)
Net realized losses reclassified into net income	24,272	24,059	73,471	54,955
Net change	118,114	(38,656)	51,842	(74,374)
Tax Effect
Net unrealized gains (losses) arising during the period	(27,737)	18,368	6,394	37,861
Net realized losses reclassified into net income	(7,175)	(7,046)	(21,717)	(16,095)
Net change	(34,912)	11,322	(15,323)	21,766
Net-of-Tax
Net unrealized gains (losses) arising during the period	66,105	(44,347)	(15,235)	(91,468)
Net realized losses reclassified into net income	17,097	17,013	51,754	38,860
Other comprehensive income (loss)	83,202	(27,334)	36,519	(52,608)
Foreign Currency Translation Adjustments
Before-Tax
Net unrealized gains (losses) arising during the period	(1,126)	3,728	1,558	247
Net change	(1,126)	3,728	1,558	247
Tax Effect
Net unrealized gains (losses) arising during the period	0	(18)	(173)	(845)
Net change	0	(18)	(173)	(845)
Net-of-Tax
Net unrealized gains (losses) arising during the period	(1,126)	3,710	1,385	(598)
Net realized losses reclassified into net income	0	0	0	0
Other comprehensive income (loss)	$ (1,126)	$ 3,710	$ 1,385	$ (598)