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SUBSEQUENT EVENTS (Details)
Jan. 06, 2021
USD ($)
apartment_community
Jan. 05, 2021
USD ($)
Dec. 31, 2020
USD ($)
Subsequent Event [Line Items]      
Aggregate borrowing amount available     $ 6,000,000.0
Unsecured debt      
Subsequent Event [Line Items]      
Aggregate borrowing amount available     150,000,000.0
Remaining borrowing capacity     $ 25,000,000.0
Subsequent Event | Unsecured debt | Unsecured Series C Debt      
Subsequent Event [Line Items]      
Original principal balance $ 50,000,000.0    
Interest rate percentage 0.00027%    
Aggregate borrowing amount available $ 225,000,000.0 $ 150,000,000.0  
Fair value of amount outstanding 175,000,000.0    
Remaining borrowing capacity $ 50,000,000.0    
Union Pointe Apartment Homes | Subsequent Event      
Subsequent Event [Line Items]      
Number of units in acquired property | apartment_community 256    
Total acquisition costs $ 76,900,000