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Other comprehensive income (loss) - Change in accumulated other comprehensive income (loss) by component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Foreign Currency Translation |  |  |  |  |
Beginning Balance | $ (68,548) | $ (61,980) | $ (64,528) | $ (56,735) |
Other comprehensive income (loss) | 165 | 6,001 | (3,855) | 756 |
Net change | 165 | 6,001 | (3,855) | 756 |
Ending Balance | (68,383) | (55,979) | (68,383) | (55,979) |
Adjustment of pension and postretirement benefit plans |  |  |  |  |
Beginning Balance | (115,632) | (141,327) | (117,894) | (144,335) |
Amounts reclassified from accumulated other comprehensive loss for amortization of net losses | 2,261 | 3,008 | 4,522 | 6,016 |
Net change | 2,261 | 3,008 | 4,522 | 6,016 |
Ending Balance |  | (138,319) |  | (138,319) |
Unrealized net holding losses on debt securities |  |  |  |  |
Beginning Balance | (1,749,006) | (2,098,518) | (1,713,109) | (2,323,903) |
Other comprehensive income (loss) | 16,941 | (69,941) | (54,163) | 121,811 |
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 | 35,537 | 34,322 | 70,745 | 67,955 |
Net change | 52,478 | (35,619) | 16,582 | 189,766 |
Ending Balance |  | (2,134,137) |  | (2,134,137) |
Unrealized net gains on cash flow hedges |  |  |  |  |
Beginning Balance | 0 | 0 | 0 | 45 |
Other comprehensive (loss) income before reclassifications | 0 | 0 | 0 | (19) |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | (26) |
Net change | 0 | 0 | 0 | (45) |
Ending Balance | 0 | 0 | 0 | 0 |
Total | $ (1,878,282) | $ (2,328,435) | $ (1,878,282) | $ (2,328,435) | $ (1,895,531)

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