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Mortgage loans (Details Textuals) - Jun. 30, 2015
$ in Millions
USD ($)
Property
USD ($)
Property
Mortgage Loans [Abstract]    
Due diligence costs related to loan transaction $ 0.7 $ 1.0
Ownership percentage beneficial interest through equity method investee 40.50% 40.50%
Residential properties    
Mortgage Loans on Real Estate [Line Items]    
Number of REO properties foreclosed | Property 34 34
Foreclosed residential properties $ 5.1 $ 5.1