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Salaries and other employee expenses - Schedule of restricted stock granted to directors (Details) - Restricted Stocks - Directors | 12 Months Ended
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Dec. 31, 2023 shares $ / shares | Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 shares $ / shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of shares, outstanding at beginning (in shares) | 105,450 | 145,800 | 132,150
Granted (in shares) | 63,000 | 57,000 | 63,000
Vested (in shares) | (53,100) | (97,350) | (49,350)
Number of shares, outstanding at end (in shares) | 115,350 | 105,450 | 145,800
Expected to vest (in shares) | 115,350 |  |
Weighted average grant date fair value, expected to vest (in usd per share) | $ / shares | $ 14.15 | $ 16.64 | $ 18.56
Granted (in usd per share) | $ / shares | 17.69 | 14.65 | 14.65
Vested (in usd per share) | $ / shares | 13.75 | 18.71 | 19.24
Weighted average grant date fair value, expected to vest (in usd per share) | $ / shares | $ 16.31 | $ 14.15 | $ 16.64

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