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Loans receivable (Details 3)
12 Months Ended
Dec. 31, 2020
Optimistic Forecast [Member]  
Loans Receivable Details [Line Items]  
Increase in delinquent loans going into collections 5.00%
Decrease in collection efficiency 5.00%
Neutral Forecast [Member]  
Loans Receivable Details [Line Items]  
Increase in delinquent loans going into collections 7.00%
Decrease in collection efficiency 10.00%
Pessimistic Forecast [Member]  
Loans Receivable Details [Line Items]  
Increase in delinquent loans going into collections 13.00%
Decrease in collection efficiency 15.00%