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Related party transactions (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]    
Receivable from servicer $ 6,949 $ 5,444
Management fee payable 703 667
Gregory | Receivables from Servicer    
Related Party Transaction [Line Items]    
Receivable from servicer 6,949 5,444
Gregory | Accrued expenses and other liabilities    
Related Party Transaction [Line Items]    
Servicing fees payable 123 152
Thetis | Management fee payable    
Related Party Transaction [Line Items]    
Management fee payable 703 667
Thetis | Prepaid expenses and other assets    
Related Party Transaction [Line Items]    
Expense reimbursement receivable $ 37