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Participations Sold (Details)
1 Months Ended 3 Months Ended
Jan. 31, 2015
USD ($)
facility
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 28, 2015
USD ($)
Feb. 28, 2015
GBP (£)
Jan. 31, 2015
GBP (£)
Aug. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
May 31, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]                  
Carrying amount of mortgage loan   $ 84,647,000 $ 84,979,000            
Commercial Mortgage Portfolio Segment [Member] | Mezzanine Loan, Acquired by Investment Funds [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Mortgage loan, face amount       $ 30,672,000 £ 20,000,000        
Hotel | Hotel - Aruba [Member] | Subordinate Mortgage Portfolio Segment [Member] | First Mortgage [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Mortgage loan, face amount                 $ 155,000,000
Senior Participation [Member] | Hotel | Hotel - Aruba [Member] | Subordinate Mortgage Portfolio Segment [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Participation in loan, amount             $ 90,000,000 $ 90,000,000  
Junior Participation [Member] | Hotel | Hotel - Aruba [Member] | Subordinate Mortgage Portfolio Segment [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Participation in loan, amount             $ 65,000,000 $ 65,000,000  
Participating Mortgages [Member] | Subordinate Mortgage Portfolio Segment [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Mortgage loan, face amount   84,647,000              
Carrying amount of mortgage loan   $ 84,647,000              
London Interbank Offered Rate (LIBOR) [Member] | Participating Mortgages [Member] | Subordinate Mortgage Portfolio Segment [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Basis point   4.40%              
International (U.K.) | Senior Housing Facility [Member] | Commercial Mortgage Portfolio Segment [Member] | Mezzanine Loan [Member]                  
Mortgage Loans on Real Estate [Line Items]                  
Mortgage loan, face amount $ 51,996,000         £ 34,519,000      
Number of properties | facility 44