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Salaries and other employee expenses (Details 3) - Stock options [Member]
 12 Months Ended
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