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COMMITMENTS AND CONTINGENCIES - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
May 15, 2012
Extension_Option
Oct. 01, 2011
Extension_Option
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Unfunded Loan Commitments              
Number of extension options | Extension_Option 0 0          
Rent expense     $ 0.3 $ 0.3 $ 0.8 $ 0.9  
Mortgage loan receivables held for investment, at amortized cost              
Unfunded Loan Commitments              
Unfunded commitments of mortgage loan receivables held for investment     145.8   145.8   $ 147.7
First mortgage loan financing              
Unfunded Loan Commitments              
Unfunded commitments of mortgage loan receivables held for investment     145.8   145.8   146.3
Mezzanine loan              
Unfunded Loan Commitments              
Unfunded commitments of mortgage loan receivables held for investment             $ 1.4
Hurricane Harvey              
Unfunded Loan Commitments              
Real estate assets and securing loans     13.0   13.0    
Hurricane Irma              
Unfunded Loan Commitments              
Real estate assets and securing loans     295.6   295.6    
Hurricane Maria              
Unfunded Loan Commitments              
Real estate assets and securing loans     $ 23.9   $ 23.9