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Salaries and other employee expenses (Details 2) - Restricted Stocks [Member]
 12 Months Ended
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