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Other comprehensive income (loss) - Change in accumulated other comprehensive income (loss) by component (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Foreign Currency Translation |  |  |  |  |
Beginning Balance | $ (70,512) | $ (68,383) | $ (71,365) | $ (64,528) |
Other comprehensive (loss) income | (14,524) | 615 | (13,670) | (3,240) |
Net change | (14,524) | 615 | (13,670) | (3,240) |
Ending Balance | (85,035) | (67,768) | (85,035) | (67,768) |
Adjustment of pension and postretirement benefit plans |  |  |  |  |
Beginning Balance | (91,851) | (113,371) | (94,692) | (117,894) |
Amounts reclassified from accumulated other comprehensive loss for amortization of net losses | 1,421 | 2,261 | 4,262 | 6,784 |
Net change | 1,421 | 2,261 | 4,262 | 6,784 |
Ending Balance | (90,430) | (111,110) | (90,430) | (111,110) |
Unrealized net holding losses on debt securities |  |  |  |  |
Beginning Balance | (1,233,294) | (1,696,528) | (1,495,183) | (1,713,109) |
Other comprehensive income | 94,747 | 326,148 | 283,394 | 271,985 |
Amounts reclassified from accumulated other comprehensive loss for amortization of net unrealized losses of debt securities transferred from available-for-sale to held-to-maturity | 37,753 | 36,264 | 110,994 | 107,008 |
Net change | 132,500 | 362,412 | 394,388 | 378,993 |
Ending Balance | (1,100,795) | (1,334,116) | (1,100,795) | (1,334,116) |
Total | (1,276,260) | $ (1,512,994) | (1,276,260) | $ (1,512,994) | $ (1,661,240)
Rounding |  |  |  |  |
Foreign Currency Translation |  |  |  |  |
Ending Balance | (85,036) |  | (85,036) |  |
Unrealized net holding losses on debt securities |  |  |  |  |
Ending Balance | $ (1,100,794) |  | $ (1,100,794) |  |

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