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Equity Investments, at Fair Value - Schedule of Income (Loss) From Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Schedule of Equity Method Investments [Line Items]        
Unrealized (losses) gains, net $ (128,056) $ 30,138 $ (279,408) $ 80,157
Equity investments | Single-Family Equity Ownership Interests        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) (3,500) 2,137 (1,700) 4,309
Equity investments | Joint venture equity investments in multi-family properties        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) (1,053) 0 (504) 0
Morrocroft Neighborhood Stabilization Fund II, LP | Equity investments | Single-Family Equity Ownership Interests        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) 0 2,137 50 4,324
Constructive Loans, LLC | Equity investments | Single-Family Equity Ownership Interests        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) (3,500) 0 (1,750) 0
Unrealized (losses) gains, net (3,500)   (1,800)  
Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I) | Equity investments | Single-Family Equity Ownership Interests        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) 0 0 0 (15)
Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I) | Equity investments | Joint venture equity investments in multi-family properties        
Schedule of Equity Method Investments [Line Items]        
Unrealized (losses) gains, net (1,100)   (500)  
GWR Cedars Partners, LLC (1) | Equity investments | Joint venture equity investments in multi-family properties        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) (1,141) 0 (930) 0
GWR Gateway Partners, LLC (1) | Equity investments | Joint venture equity investments in multi-family properties        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) $ 88 $ 0 $ 426 $ 0