DEBT - Narrative (Details)				1 Months Ended	9 Months Ended
	May 31, 2023	May 30, 2023	Apr. 26, 2023 USD ($)	Nov. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) loan apartmentCommunity	Dec. 31, 2022 USD ($) apartmentCommunity	Sep. 30, 2021 USD ($)
Line of Credit Facility [Line Items]
Number of real estate properties, unencumbered by mortgages | apartmentCommunity					46
Revolving lines of credit					$ 0	$ 113,500,000
Outstanding debt					$ 842,559,000	$ 1,011,777,000
Weighted average interest rate					3.46%	3.62%
Mortgages
Line of Credit Facility [Line Items]
Debt instrument, face amount			$ 90,000,000
Term			12 years
Weighted average interest rate			5.04%
Number of real estate properties, serving as collateral for mortgage loans | apartmentCommunity					13	15
Number of material defaults or instances of noncompliance | loan					0
Private Shelf Agreement | Unsecured Senior Notes
Line of Credit Facility [Line Items]
Debt available for issuance					$ 225,000,000
Debt instrument, face amount					25,000,000
Outstanding debt					200,000,000
Remaining available for issuance					25,000,000
Note Purchase Agreement | Unsecured Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, face amount					$ 125,000,000
PNC Bank Term Loan Agreement | Unsecured Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, face amount				$ 100,000,000
Outstanding debt						$ 100,000,000
Term				364 days	364 days
PNC Bank Term Loan Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Unsecured Senior Notes
Line of Credit Facility [Line Items]
Basis spread on variable rate				1.20%
PNC Bank Term Loan Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum | Unsecured Senior Notes
Line of Credit Facility [Line Items]
Basis spread on variable rate				1.75%
Mortgages payable - Fannie Mae | Mortgages
Line of Credit Facility [Line Items]
Debt instrument, face amount					$ 198,900,000
Outstanding debt					$ 198,850,000	$ 198,850,000
Number of apartment units | apartmentCommunity					12
Weighted average interest rate					2.78%	2.78%
Mortgages payable - Fannie Mae | Mortgages | Interest Only Payment Date One
Line of Credit Facility [Line Items]
Term					7 years
Mortgages payable - Fannie Mae | Mortgages | Interest Only Payment Date Two
Line of Credit Facility [Line Items]
Term					10 years
Mortgages payable - Fannie Mae | Mortgages | Interest Only Payment Date Three
Line of Credit Facility [Line Items]
Term					12 years
Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	13500.00%
Basis spread adjustment	1000.00%
Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	12500.00%
Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	18000.00%
Line of Credit | Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	2500.00%	0.25%
Line of Credit | Base Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	8000.00%	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%
Line of Credit | BMO Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 250,000,000
Revolving lines of credit					0
Remaining borrowing capacity					250,000,000
Accordion option							$ 400,000,000
Operating Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity					6,000,000
Revolving lines of credit					$ 0