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Applicable laws and regulations - Schedule of non-accruing loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Non-accruing loans: |  |
Total non-accruing loans | $ 10,593 | $ 10,593
Interest that would be reversed if the loans had been classified as non-accruing loans | 598 | 351
Income from collected interest on non-accruing loans | 0 | 0
Securities at FVOCI - Corporate debt |  |
Non-accruing loans: |  |
Total non-accruing loans | $ 10,593 | $ 10,593

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