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DEBT - Narrative (Details)
 9 Months Ended
Sep. 30, 2021
USD ($)
apartmentProperty
loan
Jan. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Line of Credit Facility [Line Items]      
Number of real estate properties, unencumbered by mortgages | apartmentProperty 46    
Revolving lines of credit $ 57,000,000   $ 152,871,000
Outstanding debt $ 849,397,000   $ 721,316,000
Weighted average interest rate 3.23%   3.62%
2021 Acquisitions      
Line of Credit Facility [Line Items]      
Number of apartment units | apartmentProperty 17    
Line of Credit | Base Rate | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.25%    
Line of Credit | Base Rate | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.80%    
Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.25%    
Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.80%    
Operating Line of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 6,000,000    
BMO Line of Credit | Line of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 250,000,000    
Remaining borrowing capacity 193,000,000    
Revolving lines of credit 57,000,000    
Accordion option 400,000,000    
Unsecured Senior Notes | Term Loan Maturing 2024      
Line of Credit Facility [Line Items]      
Debt instrument face amount 70,000,000    
Unsecured Senior Notes | Term Loan Maturing 2025      
Line of Credit Facility [Line Items]      
Debt instrument face amount 75,000,000    
Unsecured Senior Notes | Private Shelf Agreement      
Line of Credit Facility [Line Items]      
Debt available for issuance 25,000,000 $ 225,000,000  
Outstanding debt   $ 200,000,000  
Unsecured Senior Notes | Note Purchase Agreement      
Line of Credit Facility [Line Items]      
Debt instrument face amount $ 125,000,000    
Mortgages      
Line of Credit Facility [Line Items]      
Number of real estate properties, serving as collateral for mortgage loans | apartmentProperty 17    
Number of material defaults or instances of noncompliance | loan 0    
Mortgages | Mortgages payable - Fannie Mae      
Line of Credit Facility [Line Items]      
Debt instrument face amount $ 198,900,000    
Outstanding debt $ 198,850,000   $ 0
Weighted average interest rate 2.78%   0.00%
Mortgages | Mortgages payable - Fannie Mae | Interest Only Payment Date One      
Line of Credit Facility [Line Items]      
Term 7 years    
Mortgages | Mortgages payable - Fannie Mae | Interest Only Payment Date Two      
Line of Credit Facility [Line Items]      
Term 10 years    
Mortgages | Mortgages payable - Fannie Mae | Interest Only Payment Date Three      
Line of Credit Facility [Line Items]      
Term 12 years    
Mortgages | Mortgages payable - Fannie Mae | 2021 Acquisitions      
Line of Credit Facility [Line Items]      
Number of apartment units | apartmentProperty 16