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Salaries and other employee expenses - Schedule of restricted stock units granted to certain executives (Details) - Restricted Stocks | 12 Months Ended
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Dec. 31, 2021 USD ($) shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Aggregate intrinsic value, outstanding | $ | $ 231 |  |
Aggregate intrinsic value, expected to vest | $ | $ 231 |  |
Key management personnel of entity or parent |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of shares, outstanding at beginning (in shares) | shares | 81,343 | 42,178 | 25,162
Granted (in shares) | shares | 75,796 | 51,829 | 23,743
Forfeited (in usd per share) | shares | (1,311) |  |
Vested (in shares) | shares | (48,299) | (12,664) | (6,727)
Number of shares, outstanding at end (in shares) | shares | 107,529 | 81,343 | 42,178
Expected to vest (in shares) | shares | 107,529 |  |
Weighted average grand date fair value, outstanding at beginning (in usd per share) | $ / shares | $ 17.94 | $ 19.27 | $ 24.86
Granted (in usd per share) | $ / shares | 13.33 | 17.41 | 14.95
Forfeited (in usd per share) | $ / shares | 14.51 |  |
Vested (in usd per share) | $ / shares | 17.35 | 20.24 | 24.91
Weighted average grand date fair value, outstanding at end (in usd per share) | $ / shares | 14.99 | $ 17.94 | $ 19.27
Weighted average grand date fair value, expected to vest | $ / shares | $ 17.94 |  |
Weighted average remaining contractual term, outstanding | 2 years 6 months 21 days |  |
Weighted average remaining contractual term, expected to vest | 2 years 6 months 21 days |  |

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