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Salaries and other employee expenses - Schedule of stock options granted (Details) - Stock options | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of share options outstanding (in shares) | shares | 142,410 | 142,410 | 142,410
Exercisable (in shares) | shares | 142,410 |  |
Expected to vest (in shares) | shares | 0 |  |
Weighted average exercise price (in usd per share) | $ / shares | $ 29.25 | $ 29.25 | $ 29.25
Weighted average exercise price, exercisable (in usd per share) | $ / shares | 29.25 |  |
Weighted average exercise price, expected to vest (in usd per share) | $ / shares | $ 0 |  |
Weighted average remaining contractual term of outstanding | 0.11 years |  |
Weighted average remaining contractual term, exercisable | 0.11 years |  |
Aggregate intrinsic value, outstanding | $ | $ 0 |  |
Aggregate intrinsic value, exercisable | $ | 0 |  |
Aggregate intrinsic value, expected to vest | $ | $ 0 |  |

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