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Other Assets - Summary of Taxable MRB Acquired (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Unit
Dec. 31, 2019
USD ($)
Mortgage Loans On Real Estate [Line Items]    
Units 3,756  
Principal Acquired | $ $ 9,498,500 $ 19,250,000
Taxable MRB [Member] | Ocotillo Springs [Member] | Series A-T [Member] | Brawley, CA [Member]    
Mortgage Loans On Real Estate [Line Items]    
Month Acquired July  
Units 75  
Original Maturity Date Aug. 01, 2022  
Interest Rate [1] 4.91%  
[1] The taxable MRB has a variable interest rate equal to the 1-month LIBOR plus 3.55%, subject to a floor of 4.91%.