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Other comprehensive income (loss) - Reclassification out of accumulated other comprehensive income - Parenthetical (Details) - USD ($) $ in Thousands |  | 12 Months Ended
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Oct. 15, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reclassification out of accumulated other comprehensive loss |  |  |  |
Available-for-sale securities transfer to Held-to-maturity |  | $ 0 | $ 6,531,092 | $ 0
US Treasury Securities |  |  |  |
Reclassification out of accumulated other comprehensive loss |  |  |  |
Available-for-sale securities transfer to Held-to-maturity | $ 6,500,000 |  |  |
Available-for-sale securities transfer to Held-to-Maturity at par value | $ 7,400,000 |  |  |

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