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Equity Investments, at Fair Value - Schedule of Income (Loss) From Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Unrealized gain, net $ (83,659) $ 26,166
Equity investments | Single-Family Equity Ownership Interests    
Schedule of Equity Method Investments [Line Items]    
Change in fair value, gain (loss) 28 (2,100)
Equity investments | Joint venture equity investments in multi-family properties    
Schedule of Equity Method Investments [Line Items]    
Change in fair value, gain (loss) 250 0
Unrealized gain, net 300  
Morrocroft Neighborhood Stabilization Fund II, LP (1) | Equity investments | Single-Family Equity Ownership Interests    
Schedule of Equity Method Investments [Line Items]    
Change in fair value, gain (loss) 28 1,188
Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I) (2) | Equity investments | Single-Family Equity Ownership Interests    
Schedule of Equity Method Investments [Line Items]    
Change in fair value, gain (loss) 0 (3,288)
GWR Cedars Partners, LLC | Equity investments | Joint venture equity investments in multi-family properties    
Schedule of Equity Method Investments [Line Items]    
Change in fair value, gain (loss) 100 0
GWR Gateway Partners, LLC | Equity investments | Joint venture equity investments in multi-family properties    
Schedule of Equity Method Investments [Line Items]    
Change in fair value, gain (loss) $ 150 $ 0