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Salaries and other employee expenses - Schedule of restricted stock units granted to certain executives (Details) - Restricted Stocks $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) shares $ / shares | Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 shares $ / shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Aggregate intrinsic value, outstanding | $ | $ 2,769 |  |
Aggregate intrinsic value, expected to vest | $ | $ 2,769 |  |
Key management personnel of entity or parent |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of shares, outstanding at beginning (in shares) | shares | 134,175 | 107,529 | 81,343
Granted (in shares) | shares | 298,951 | 63,056 | 75,796
Forfeited (in usd per share) | shares | (346) |  | (1,311)
Vested (in shares) | shares | (152,305) | (36,410) | (48,299)
Number of shares, outstanding at end (in shares) | shares | 280,475 | 134,175 | 107,529
Expected to vest (in shares) | shares | 280,475 |  |
Weighted average grant date fair value, expected to vest (in usd per share) | $ / shares | $ 13.80 | $ 14.99 | $ 17.94
Granted (in usd per share) | $ / shares | 15.36 | 13.03 | 13.33
Forfeited (in usd per share) | $ / shares | 14.95 |  | 14.51
Vested (in usd per share) | $ / shares | 15.57 | 15.97 | 17.35
Weighted average grant date fair value, expected to vest (in usd per share) | $ / shares | 14.50 | $ 13.80 | $ 14.99
Weighted average grand date fair value, expected to vest | $ / shares | $ 14.50 |  |
Weighted average remaining contractual term, outstanding | 1 year 11 months 26 days |  |
Weighted average remaining contractual term, expected to vest | 1 year 11 months 26 days |  |

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