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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) apartmentCommunity apartmentHome	Mar. 31, 2021 USD ($) apartmentHome	Sep. 01, 2021 apartmentCommunity
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost	$ 116,874
Form of Consideration
Cash	9,093
Units	22,882
Other	84,899
Investment Allocation
Land	7,339
Building	106,080
Intangible Assets	4,672
Other	$ (1,217)
2022 Acquisitions
Acquisitions and development projects placed in service [Abstract]
Number of properties acquired \| apartmentCommunity	4
Total acquisition cost	$ 116,900
Martin Blu - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of properties acquired \| apartmentHome	191
Total acquisition cost	$ 49,825
Form of Consideration
Cash	3,031
Units	18,885
Other	27,909
Investment Allocation
Land	3,547
Building	45,212
Intangible Assets	1,813
Other	$ (747)
Zest - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of properties acquired \| apartmentHome	31
Total acquisition cost	$ 9,066
Form of Consideration
Cash	1,290
Units	1,748
Other	6,028
Investment Allocation
Land	941
Building	7,853
Intangible Assets	335
Other	$ (63)
Elements - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of properties acquired \| apartmentHome	45
Total acquisition cost	$ 11,364
Form of Consideration
Cash	1,429
Units	2,249
Other	7,686
Investment Allocation
Land	936
Building	10,261
Intangible Assets	574
Other	$ (407)
Noko Apartments - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of properties acquired \| apartmentHome	130
Total acquisition cost	$ 46,619
Form of Consideration
Cash	3,343
Units	0
Other	43,276
Investment Allocation
Land	1,915
Building	42,754
Intangible Assets	1,950
Other	$ 0
2021 Acquisitions
Acquisitions and development projects placed in service [Abstract]
Number of properties acquired \| apartmentCommunity			17
Total acquisition cost		$ 76,900
Union Pointe Apartment Homes - Longmont, CO
Acquisitions and development projects placed in service [Abstract]
Number of properties acquired \| apartmentHome		256
Total acquisition cost		$ 76,900
Form of Consideration
Cash		76,900
Investment Allocation
Land		5,727
Building		69,966
Intangible Assets		$ 1,207