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Fair Value of Financial Instruments - Financial Instruments Carried at Fair Value in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Real estate securities at fair value $ 91,218 $ 25,993
Fair Value Measurements, Recurring | Real Estate Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Real estate securities at fair value 91,218 25,993
Fair Value Measurements, Recurring | Real Estate Securities | Level II    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Real estate securities at fair value $ 91,218 $ 25,993