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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]        
Unrealized losses $ 61,295 $ 152,078 $ 55,738 $ 303,430
Equity investments | Single-Family Equity Ownership Interests        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) 0 (3,500) (2,500) (1,700)
Equity investments | Joint venture equity investments in multi-family properties        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) (2,622) (1,053) (3,937) (504)
Constructive Loans, LLC | Equity investments | Single-Family Equity Ownership Interests        
Schedule of Equity Method Investments [Line Items]        
Change in fair value, gain (loss) 0 (3,500) (2,500) (1,750)
Unrealized losses 1,300 3,500 5,600 1,800
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 0 0 50
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) (1,020) (1,141) (1,220) (930)
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) (1,602) 88 (2,717) 426
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 $ 2,600 $ 1,100 $ 3,900 $ 500