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Fair value of financial instruments (Details 1) - 6 months ended Jun. 30, 2015
Total
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Cost of debt 4.25%
Re-performing loans | Minimum  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Equity discount rate 8.00%
Loan resolution timelines 4 years
Re-performing loans | Maximum  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Equity discount rate 14.00%
Loan resolution timelines 7 years
Non-performing loans | Minimum  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Equity discount rate 10.00%
Loan resolution timelines 1 year 4 months 24 days
Non-performing loans | Maximum  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Equity discount rate 18.00%
Loan resolution timelines 4 years