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Salaries and other employee expenses (Details 2) - Restricted Stocks [Member] | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Aggregate Intrinsic value, Outstanding | $ 15.71 |  |
Aggregate Intrinsic value, Expected to vest | $ 15.71 |  |
Key management personnel of entity or parent [member] |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of Shares, Outstanding at Beginning | 42,178 | 25,162 | 50,805
Number of Shares, Granted | 51,829 | 23,743 | 23,412
Number of Shares, Vested | (12,664) | (6,727) | (49,055)
Number of Shares, Outstanding at End | 81,343 | 42,178 | 25,162
Number of Shares, Expected to vest | 81,343 |  |
Weighted average grand date fair value Outstanding at beginning | $ / shares | $ 19.27 | $ 24.86 | $ 21.07
Weighted average grand date fair value, Granted | $ / shares | 17.41 | 14.95 | 24.80
Weighted average grand date fair value, Vested | $ / shares | 20.24 | 24.92 | 20.90
Weighted average grand date fair value, Outstanding at End | $ / shares | $ 17.93 | $ 19.27 | $ 24.86
Weighted average remaining contractual term, Outstanding | 2 years 7 months 2 days |  |
Weighted average grand date fair value, Expected to vest | $ / shares | $ 17.93 |  |
Weighted average remaining contractual term, Expected to vest | 2 years 7 months 6 days |  |

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