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Financial risk review - Schedule of Reconciliation of Changes in the Net Carrying Amount of Credit-Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Credit risk |  |
Write-offs | $ (7,000) |
Write-offs | (5,254) | $ 0
Loans at amortized cost |  |
Credit risk |  |
Credit-impaired loans at beginning of year | 6,763,020 |
Credit-impaired loans at end of year | 7,195,567 | 6,763,020
Loans at amortized cost | Carrying amount - principal |  |
Credit risk |  |
Credit-impaired loans at beginning of year | 6,763,020 |
Credit-impaired loans at end of year | 7,195,567 | 6,763,020
Loans at amortized cost | Loss allowance |  |
Credit risk |  |
Credit-impaired loans at beginning of year | 55,200 | 41,476
Write-offs | (21,144) | (893)
Recoveries of amounts previously written off |  | 1,066
Credit-impaired loans at end of year | 59,410 | 55,200
Investments at amortized cost with credit impairment at beginning of year | 4,002 | 0
Classified as credit-impaired during the year | 0 | 33
Change in allowance for expected credit losses | 1,249 | 3,717
Interest income | 3 | 252
Investments at amortized cost with credit impairment at end of year | 0 | 4,002
Financial instruments credit-impaired | Loans at amortized cost | Carrying amount - principal |  |
Credit risk |  |
Credit-impaired loans at beginning of year | 21,561 | 5,186
Classified as credit-impaired during the year | 0 | 130
Change in allowance for expected credit losses | 6,181 | 14,606
Write-offs | (21,144) | (893)
Recoveries of amounts previously written off | 0 | 1,066
Interest income | 300 | 1,466
Credit-impaired loans at end of year | $ 6,898 | $ 21,561

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