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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)

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