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Related party transactions (Details) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Total
Related Party Transaction [Line Items]    
Management fee $ 900  
Thetis | Management fee    
Related Party Transaction [Line Items]    
Management fee 856 $ 1,602
Gregory | Loan servicing fees    
Related Party Transaction [Line Items]    
Loan servicing fees 851 1,507
Gregory | Loan transaction expense    
Related Party Transaction [Line Items]    
Due diligence and related loan acquisition costs $ 1 19
Aspen Yo | Professional fees    
Related Party Transaction [Line Items]    
Expense reimbursements   $ 3