Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Before-Tax
Net change	$ (134,036)	$ (278,005)	$ (154,395)	$ (997,274)
Tax Effect
Net change	40,591	78,621	44,647	287,623
Net-of-Tax
Other comprehensive loss	(93,445)	(199,384)	(109,748)	(709,651)
Debt Securities
Before-Tax
Net unrealized losses on AFS debt securities arising during the period			(102,262)	(742,132)
Unrealized losses on debt securities transferred from AFS to HTM			0	(160,416)
Net realized losses (gains) on AFS debt securities reclassified into net income			10,000	(1,306)
Amortization of unrealized losses on transferred securities	4,075	4,623	11,994	13,228
Net unrealized losses arising during the period	(103,183)	(229,246)
Net change	(99,108)	(224,623)	(80,268)	(890,626)
Tax Effect
Net unrealized losses on AFS debt securities arising during the period			30,228	219,459
Unrealized losses on debt securities transferred from AFS to HTM			0	47,425
Net realized losses (gains) on AFS debt securities reclassified into net income			(2,956)	386
Amortization of unrealized losses on transferred securities	(1,205)	(1,367)	(3,546)	(3,911)
Net unrealized losses arising during the period	30,492	67,801
Net change	29,287	66,434	23,726	263,359
Net-of-Tax
Net unrealized losses on AFS debt securities arising during the period			(72,034)	(522,673)
Unrealized losses on debt securities transferred from AFS to HTM			0	(112,991)
Net realized losses (gains) on AFS debt securities reclassified into net income			7,044	(920)
Amortization of unrealized losses on transferred securities	2,870	3,256	8,448	9,317
Net unrealized losses arising during the period	(72,691)	(161,445)	(72,034)	(635,664)
Net realized losses (gains) reclassified into net income	2,870	3,256	15,492	8,397
Other comprehensive loss	(69,821)	(158,189)	(56,542)	(627,267)
Cash Flow Hedges
Before-Tax
Net unrealized losses arising during the period	(62,715)	(48,325)	(129,329)	(88,771)
Net realized losses (gains) reclassified into net income	24,059	1,619	54,955	(1,601)
Net change	(38,656)	(46,706)	(74,374)	(90,372)
Tax Effect
Net unrealized losses arising during the period	18,368	13,902	37,861	25,539
Net realized losses (gains) reclassified into net income	(7,046)	(465)	(16,095)	461
Net change	11,322	13,437	21,766	26,000
Net-of-Tax
Net unrealized losses arising during the period	(44,347)	(34,423)	(91,468)	(63,232)
Net realized losses (gains) reclassified into net income	17,013	1,154	38,860	(1,140)
Other comprehensive loss	(27,334)	(33,269)	(52,608)	(64,372)
Foreign Currency Translation Adjustments
Before-Tax
Net unrealized losses arising during the period	3,728	(6,676)	247	(16,276)
Net change	3,728	(6,676)	247	(16,276)
Tax Effect
Net unrealized losses arising during the period	(18)	(1,250)	(845)	(1,736)
Net change	(18)	(1,250)	(845)	(1,736)
Net-of-Tax
Net unrealized losses arising during the period	3,710	(7,926)	(598)	(18,012)
Net realized losses (gains) reclassified into net income	0	0	0	0
Other comprehensive loss	$ 3,710	$ (7,926)	$ (598)	$ (18,012)