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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Debt securities gains (losses), net | $ 76 |  |  | $ 241 |  |  | $ 90 | $ 5,440
Income tax (expense) benefit | (41,280) |  |  | (44,304) |  |  | (109,018) | (133,118)
Interest income (expense) | (391,724) |  |  | (375,086) |  |  | (1,136,603) | (1,138,745)
Salaries and employee benefits | 147,494 |  |  | 131,541 |  |  | 456,490 | 404,715
Net income | (143,802) | $ (121,229) | $ (120,284) | (147,876) | $ (155,036) | $ (146,600) | (385,315) | (449,512)
Amount Reclassified from AOCI |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Net income | (7,254) |  |  | (8,024) |  |  | (20,885) | (1,565)
Amount Reclassified from AOCI | Unrealized gains and losses on available-for-sale securities |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Debt securities gains (losses), net | (76) |  |  | (241) |  |  | (90) | (5,440)
Income tax (expense) benefit | 19 |  |  | 63 |  |  | 23 | 1,407
Net income | (57) |  |  | (178) |  |  | (67) | (4,033)
Amount Reclassified from AOCI | Amortization of unrealized losses on held-to-maturity securities transferred from available-for-sale |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income tax (expense) benefit | 1,203 |  |  | 1,430 |  |  | 3,411 | 4,186
Interest income (expense) | (4,740) |  |  | (5,623) |  |  | (13,434) | (16,574)
Net income | (3,537) |  |  | (4,193) |  |  | (10,023) | (12,388)
Amount Reclassified from AOCI | Gains and losses on hedges Interest rate contracts | Interest rate contracts |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income tax (expense) benefit | 1,276 |  |  | 1,274 |  |  | 3,765 | (5,174)
Interest income (expense) | (4,936) |  |  | (4,927) |  |  | (14,560) | 19,893
Net income | $ (3,660) |  |  | $ (3,653) |  |  | (10,795) | 14,719
Amount Reclassified from AOCI | Actuarial gains (losses) |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Income tax (expense) benefit |  |  |  |  |  |  | 0 | (45)
Salaries and employee benefits |  |  |  |  |  |  | 0 | 182
Net income |  |  |  |  |  |  | $ 0 | $ 137

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