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Salaries and other employee expenses (Details 3) - Stock options [Member] | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of Share Options Outstanding at Beginning | 142,410 | 142,410 | 273,643
Number of share options Granted |  |  | 0
Number of share options Forfeited |  |  | (28,315)
Number of share options Exercised | 0 | 0 | (102,918)
Number of Share Options Outstanding at End | 142,410 | 142,410 | 142,410
Number of share options Exercisable | 142,410 |  |
Number of share options Expected to vest | shares | 0 |  |
Weighted average exercise price, Outstanding at Beginning | $ / shares | $ 29.25 | $ 29.25 | $ 27.48
Weighted average exercise price, Granted | $ / shares |  |  | 0.00
Weighted average exercise price, Forfeited | $ / shares |  |  | 29.25
Weighted average exercise price, Exercised | $ / shares |  |  | 24.55
Weighted average exercise price, Exercisable | $ / shares | 29.25 |  |
Weighted average exercise price, Outstanding at End | $ / shares | $ 29.25 | $ 29.25 | $ 29.25
Weighted average exercise price, Exercisable, Expected to vest | $ / shares | $ 0.00 |  |
Weighted Average Remaining Contractual Term of Outstanding | P1Y1M10D |  |
Weighted average remaining contractual term, Exercisable | P1Y1M10D |  |
Aggregate Intrinsic value, Outstanding at End | $ 0 |  |
Aggregate Intrinsic value, Exercisable | 0 |  |
Aggregate Intrinsic value, Expected to vest | $ 0 |  |

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