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Real Estate Securities - Additional Information (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Rating
Investment
Security
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Rating
Investment
Security
Schedule Of Available For Sale Securities [Line Items]      
Number of investments | Investment 11   10
Carrying value of investments $ 98,122,000   $ 91,218,000
Unrealized loss 79,000   1,243,000
Available for sale securities amortized cost 97,558,000   92,461,000
Par Value 98,557,000   $ 93,522,000
Unrealized gain $ 643,000    
Number of positions in unrealized loss for a period greater than 12 months | Investment 0   0
Realized gains or losses $ (43,000)   $ 0
Real estate securities sold $ 9,211,000 $ 77,000  
Weighted average risk rating | Rating 2   2
Commercial Mortgage Loans      
Schedule Of Available For Sale Securities [Line Items]      
Number of investments | Investment 11   10
Carrying value of investments $ 98,122,000   $ 91,218,000
Unrealized loss $ 79,000   $ 1,243,000
Number of available for sale securities purchased at a discount | Security 5   3
Available for sale securities amortized cost $ 999,000   $ 1,061,000
Par Value 98,557,000   93,522,000
Unrealized gain 643,000    
Discount or premium $ 0   $ 0
Weighted average risk rating | Rating 2   2