DEBT - Narrative (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) apartmentCommunity loan	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($) apartmentCommunity	Jan. 31, 2021 USD ($)
Line of Credit Facility [Line Items]
Number of real estate properties, unencumbered by mortgages | apartmentCommunity	49
Revolving lines of credit	$ 46,000,000	$ 76,000,000
Outstanding debt	$ 870,963,000	$ 859,784,000
Weighted average interest rate	3.29%	3.26%
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	204,000,000
Revolving lines of credit	46,000,000
Accordion option			$ 400,000,000
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
Amount			25,000,000
Unsecured Senior Notes | Note Purchase Agreement
Line of Credit Facility [Line Items]
Amount			125,000,000
Mortgages
Line of Credit Facility [Line Items]
Number of real estate properties, serving as collateral for mortgage loans | apartmentCommunity	18
Number of material defaults or instances of noncompliance | loan	0
Mortgages | Mortgages payable - Fannie Mae
Line of Credit Facility [Line Items]
Outstanding debt	$ 198,850,000	$ 198,850,000
Amount			$ 198,900,000
Weighted average interest rate	2.78%	2.78%
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 | apartmentCommunity			16