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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, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of shares, outstanding at beginning (in shares) | 132,150 | 109,350 | 103,650
Granted (in shares) | 63,000 | 63,000 | 57,000
Vested (in shares) | (49,350) | (40,200) | (51,300)
Number of shares, outstanding at end (in shares) | 145,800 | 132,150 | 109,350
Expected to vest (in shares) | 145,800 |  |
Weighted average grand date fair value, outstanding at beginning (in usd per share) | $ / shares | $ 18.56 | $ 25.44 | $ 27.82
Granted (in usd per share) | $ / shares | 14.65 | 11.54 | 22.68
Vested (in usd per share) | $ / shares | 19.24 | 26.26 | 27.19
Weighted average grand date fair value, outstanding at end (in usd per share) | $ / shares | $ 16.64 | $ 18.56 | $ 25.44

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