Accumulated Other Comprehensive Income (Loss) - 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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Before-Tax
Net change	$ 110,520	$ 308,347	$ 297,168	$ 259,725
Tax Effect
Net change	(23,697)	(91,478)	(87,465)	(76,433)
Net-of-Tax
Amortization of unrealized losses on transferred securities	4,102	2,765	8,015	8,161
Net unrealized (losses) gains arising during the period	76,479	197,109	187,037	124,771
Net realized losses reclassified into net income	10,344	19,760	22,666	58,521
Other comprehensive income	86,823	216,869	209,703	183,292
Debt Securities
Before-Tax
Net unrealized gains arising during the period	98,241	187,578	211,737	196,717
Net realized losses (gains) on AFS debt securities reclassified into net income	2,943	(145)	2,066	(1,979)
Amortization of unrealized losses on transferred securities	3,785	3,926	11,379	11,587
Net change	104,969	191,359	225,182	206,325
Tax Effect
Net unrealized gains arising during the period	(21,481)	(55,448)	(62,674)	(58,096)
Net realized losses (gains) on AFS debt securities reclassified into net income	(858)	43	(611)	585
Amortization of unrealized losses on transferred securities	317	(1,161)	(3,364)	(3,426)
Net change	(22,022)	(56,566)	(66,649)	(60,937)
Net-of-Tax
Net unrealized gains arising during the period	76,760	132,130	149,063	138,621
Net realized losses (gains) on AFS debt securities reclassified into net income	2,085	(102)	1,455	(1,394)
Amortization of unrealized losses on transferred securities	4,102	2,765	8,015	8,161
Net unrealized (losses) gains arising during the period	76,760	132,130	149,063	138,621
Net realized losses reclassified into net income	6,187	2,663	9,470	6,767
Other comprehensive income	82,947	134,793	158,533	145,388
Cash Flow Hedges
Before-Tax
Net unrealized (losses) gains arising during the period	(2,658)	93,842	53,536	(21,629)
Net realized losses reclassified into net income	6,001	24,272	18,584	73,471
Net change	3,343	118,114	72,120	51,842
Tax Effect
Net unrealized (losses) gains arising during the period	303	(27,737)	(15,521)	6,394
Net realized losses reclassified into net income	(1,844)	(7,175)	(5,388)	(21,717)
Net change	(1,541)	(34,912)	(20,909)	(15,323)
Net-of-Tax
Net unrealized (losses) gains arising during the period	(2,355)	66,105	38,015	(15,235)
Net realized losses reclassified into net income	4,157	17,097	13,196	51,754
Other comprehensive income	1,802	83,202	51,211	36,519
Foreign Currency Translation Adjustments
Before-Tax
Net unrealized (losses) gains arising during the period	2,208	(1,126)	(134)	1,558
Net change	2,208	(1,126)	(134)	1,558
Tax Effect
Net unrealized (losses) gains arising during the period	(134)	0	93	(173)
Net change	(134)	0	93	(173)
Net-of-Tax
Net unrealized (losses) gains arising during the period	2,074	(1,126)	(41)	1,385
Net realized losses reclassified into net income	0	0	0	0
Other comprehensive income	$ 2,074	$ (1,126)	$ (41)	$ 1,385