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Equity Investments - (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Equity investments $ 259,095 $ 189,965  
Other income (losses) 1,097 2,420 $ 12,146
Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Other income (losses) 300    
Joint Venture Equity Investments In Multi-family Properties      
Schedule of Equity Method Investments [Line Items]      
Other income (losses) (9,700) 300 4,000
Realized (losses) gains, net 8,800 10,200 4,000
Equity Method Investments      
Schedule of Equity Method Investments [Line Items]      
Fair Value 76,330 83,882  
Changes in fair value, gain (loss) 16,587 8,541 1,436
Equity Method Investments | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Fair Value 182,765    
Equity investments   106,083  
Equity Method Investments | BBA-EP320 II, L.L.C., BBA-Ten10 II, L.L.C., and Lexington on the Green Apartments, L.L.C. (collectively)      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 1,260 $ 1,167 1,050
Equity Method Investments | BBA-EP320 II, L.L.C., BBA-Ten10 II, L.L.C., and Lexington on the Green Apartments, L.L.C. (collectively) | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 45.00% 45.00%  
Fair Value $ 11,441    
Equity investments   $ 10,108  
Equity Method Investments | Somerset Deerfield Investor, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 2,168 $ 1,992 251
Equity Method Investments | Somerset Deerfield Investor, LLC | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 45.00% 45.00%  
Fair Value $ 18,792    
Equity investments   $ 17,417  
Equity Method Investments | RS SWD Owner, LLC, RS SWD Mitchell Owner, LLC, RS SWD IF Owner, LLC, RS SWD Mullis Owner, LLC, RS SWD JH Mullis Owner, LLC and RS SWD Saltzman Owner, LLC (collectively)      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 551 $ 539 76
Equity Method Investments | RS SWD Owner, LLC, RS SWD Mitchell Owner, LLC, RS SWD IF Owner, LLC, RS SWD Mullis Owner, LLC, RS SWD JH Mullis Owner, LLC and RS SWD Saltzman Owner, LLC (collectively) | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 43.00% 43.00%  
Fair Value $ 5,140    
Equity investments   $ 4,878  
Equity Method Investments | Audubon Mezzanine Holdings, L.L.C. (Series A)      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 1,213 $ 1,224 59
Equity Method Investments | Audubon Mezzanine Holdings, L.L.C. (Series A) | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 57.00% 57.00%  
Fair Value $ 11,456    
Equity investments   $ 10,998  
Equity Method Investments | EP 320 Growth Fund, L.L.C. (Series A) and Turnbury Park Apartments - BC, L.L.C. (Series A) (collectively)      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 782 $ 741 0
Equity Method Investments | EP 320 Growth Fund, L.L.C. (Series A) and Turnbury Park Apartments - BC, L.L.C. (Series A) (collectively) | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 46.00% 46.00%  
Fair Value $ 7,234    
Equity investments   $ 6,847  
Equity Method Investments | Walnut Creek Properties Holdings, L.L.C.      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 928 $ 803 0
Equity Method Investments | Walnut Creek Properties Holdings, L.L.C. | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 36.00% 36.00%  
Fair Value $ 8,803    
Equity investments   $ 8,288  
Equity Method Investments | Towers Property Holdings, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 1,243 $ 638 0
Equity Method Investments | Towers Property Holdings, LLC | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 37.00% 37.00%  
Fair Value $ 12,119    
Equity investments   $ 11,278  
Equity Method Investments | Mansions Property Holdings, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 1,198 $ 615 0
Equity Method Investments | Mansions Property Holdings, LLC | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 34.00% 34.00%  
Fair Value $ 11,679    
Equity investments   $ 10,867  
Equity Method Investments | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively)      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 454 $ 188 0
Equity Method Investments | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 43.00% 43.00%  
Fair Value $ 4,320    
Equity investments   $ 4,062  
Equity Method Investments | Gen1814, LLC - Series A, Highlands - Mtg. Holdings, LLC - Series A, and Polos at Hudson Investments, LLC - Series A (collectively)      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 1,044 $ 367 0
Equity Method Investments | Gen1814, LLC - Series A, Highlands - Mtg. Holdings, LLC - Series A, and Polos at Hudson Investments, LLC - Series A (collectively) | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 37.00% 37.00%  
Fair Value $ 9,966    
Equity investments   $ 9,396  
Equity Method Investments | Axis Apartments Holdings, LLC, Arbor-Stratford Holdings II, LLC - Series B, Highlands - Mtg. Holdings, LLC - Series B, Oakley Shoals Apartments, LLC - Series C, and Woodland Park Apartments II, LLC (collectively)      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 1,293 $ 267 0
Equity Method Investments | Axis Apartments Holdings, LLC, Arbor-Stratford Holdings II, LLC - Series B, Highlands - Mtg. Holdings, LLC - Series B, Oakley Shoals Apartments, LLC - Series C, and Woodland Park Apartments II, LLC (collectively) | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 53.00% 53.00%  
Fair Value $ 12,337    
Equity investments   $ 11,944  
Equity Method Investments | DCP Gold Creek, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 701 $ 0 0
Equity Method Investments | DCP Gold Creek, LLC | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 44.00% 0.00%  
Fair Value $ 6,357    
Equity investments   $ 0  
Equity Method Investments | 1122 Chicago DE, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 835 $ 0 0
Equity Method Investments | 1122 Chicago DE, LLC | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 53.00% 0.00%  
Fair Value $ 7,222    
Equity investments   $ 0  
Equity Method Investments | Rigsbee Ave Holdings, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 1,148 $ 0 0
Equity Method Investments | Rigsbee Ave Holdings, LLC | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 56.00% 0.00%  
Fair Value $ 10,222    
Equity investments   $ 0  
Equity Method Investments | Bighaus, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 1,002 $ 0 0
Equity Method Investments | Bighaus, LLC | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 42.00% 0.00%  
Fair Value $ 14,525    
Equity investments   $ 0  
Equity Method Investments | FF/RMI 20 Midtown, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 686 $ 0 0
Equity Method Investments | FF/RMI 20 Midtown, LLC | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 51.00% 0.00%  
Fair Value $ 23,936    
Equity investments   $ 0  
Equity Method Investments | Lurin-RMI, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 81 $ 0 0
Equity Method Investments | Lurin-RMI, LLC | Preferred Equity Ownership Interests      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 38.00% 0.00%  
Fair Value $ 7,216    
Equity investments   $ 0  
Equity Method Investments | The Preserve at Port Royal Venture, LLC      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 0.00% 77.00%  
Fair Value $ 0 $ 18,310  
Changes in fair value, gain (loss) $ (949) $ 5,374 1,778
Equity Method Investments | Morrocroft Neighborhood Stabilization Fund II, LP      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 11.00% 11.00%  
Fair Value $ 13,040 $ 11,796  
Changes in fair value, gain (loss) $ 1,519 $ 843 1,131
Equity Method Investments | Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I)      
Schedule of Equity Method Investments [Line Items]      
Ownership Interest 49.00% 49.00%  
Fair Value $ 63,290 $ 53,776  
Changes in fair value, gain (loss) 9,513 3,776 0
Equity Method Investments | Evergreens JV Holdings, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) 0 5,107 4,312
Equity Method Investments | WR Savannah Holdings, LLC      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) 0 0 1,854
Equity Method Investments | Joint Venture in Multi-family Properties and Entities that Invest In Residential Properties and Loans      
Schedule of Equity Method Investments [Line Items]      
Changes in fair value, gain (loss) $ 10,083 $ 15,100 $ 9,075