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Financial risk - Changes in the net carrying amount (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Credit risk |  |
Write-offs | $ 0 | $ (5,750)
Loans at amortized cost |  |
Credit risk |  |
Financial assets at beginning of period | 4,911,397 |
Financial assets at end of period | 5,734,605 | 4,911,397
Loans at amortized cost | Costs: |  |
Credit risk |  |
Financial assets at beginning of period | 4,911,397 |
Financial assets at end of period | 5,734,605 | 4,911,397
Sale of the outstanding credit-impaired loan in Stage 3 |  |
Credit risk |  |
Financial assets at beginning of period | 11,600 |
Financial assets at end of period |  | 11,600
Book value |  | 52,100
Financial instruments credit-impaired | Loans at amortized cost | Costs: |  |
Credit risk |  |
Financial assets at beginning of period | 4,588 | 54,573
Classified as credit-impaired during the year | 0 | 2,100
Change in allowance for expected credit losses | 191 | (744)
Recoveries of amounts previously written off | 160 | 139
Interest income | 247 | 626
Write-offs | 0 | (52,106)
Financial assets at end of period | $ 5,186 | $ 4,588

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