DEBT - Schedule of Debt (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) apartmentCommunity	Dec. 31, 2021 USD ($) apartmentCommunity
Debt Instrument [Line Items]
Total debt	$ 971,306	$ 859,784
Weighted average interest rate	3.45%	3.26%
Weighted average maturity (in years)	6 years 3 months 29 days
Mortgages
Debt Instrument [Line Items]
Number of real estate properties, serving as collateral for mortgage loans | apartmentCommunity	15	14
Mortgages payable - Fannie Mae | Mortgages
Debt Instrument [Line Items]
Total debt	$ 198,850	$ 198,850
Weighted average interest rate	2.78%	2.78%
Weighted average maturity (in years)	8 years 9 months 25 days
Mortgages payable - other | Mortgages
Debt Instrument [Line Items]
Total debt	$ 300,956	$ 284,934
Weighted average interest rate	3.85%	3.81%
Weighted average maturity (in years)	5 years 10 days
Unsecured Debt
Debt Instrument [Line Items]
Total debt	$ 471,500	$ 376,000
Weighted average maturity (in years)	6 years 1 month 9 days
Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Total debt	$ 171,500	76,000
Weighted average maturity (in years)	3 years
Unsecured Debt | Unsecured senior notes
Debt Instrument [Line Items]
Total debt	$ 300,000	$ 300,000
Weighted average interest rate	3.12%	3.12%
Weighted average maturity (in years)	7 years 10 months 17 days
Unsecured Debt | Primary Line Of Credit | Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate	3.28%	2.74%