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Fair value (Details 1)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost of debt 4.25% 4.25%
Re-performing loans | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Equity discount rate 7.00% 7.00%
Loan resolution timelines 4 years 4 years
Re-performing loans | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Equity discount rate 14.00% 14.00%
Loan resolution timelines 7 years 7 years
Non-performing loans | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Equity discount rate 10.00% 10.00%
Loan resolution timelines 1 year 4 months 24 days 1 year 4 months 24 days
Non-performing loans | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Equity discount rate 18.00% 18.00%
Loan resolution timelines 4 years 4 years