ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 01, 2021 USD ($) apartmentCommunity	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) apartmentHome	Sep. 30, 2021 USD ($) apartmentHome
2022 Acquisitions
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost				$ 211,874
Form of Consideration
Cash				104,093
Units				22,882
Other				84,899
Investment Allocation
Land		$ 13,812		13,812
Building		192,229		192,229
Intangible Assets		7,050		7,050
Other		(1,217)		$ (1,217)
Martin Blu - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes 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		3,547
Building		45,212		45,212
Intangible Assets		1,813		1,813
Other		(747)		$ (747)
Elements - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome				31
Total acquisition cost				$ 9,066
Form of Consideration
Cash				1,290
Units				1,748
Other				6,028
Investment Allocation
Land		941		941
Building		7,853		7,853
Intangible Assets		335		335
Other		(63)		$ (63)
Zest - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome				45
Total acquisition cost				$ 11,364
Form of Consideration
Cash				1,429
Units				2,249
Other				7,686
Investment Allocation
Land		936		936
Building		10,261		10,261
Intangible Assets		574		574
Other		(407)		$ (407)
Noko Apartments - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome				130
Total acquisition cost				$ 46,619
Form of Consideration
Cash				3,343
Units				0
Other				43,276
Investment Allocation
Land		1,915		1,915
Building		42,754		42,754
Intangible Assets		1,950		1,950
Other		0		$ 0
Lyra Apartments - Centennial, CO
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome				215
Total acquisition cost		95,000		$ 95,000
Form of Consideration
Cash				95,000
Units				0
Other				0
Investment Allocation
Land		6,473		6,473
Building		86,149		86,149
Intangible Assets		2,378		2,378
Other		$ 0		$ 0
2021 Acquisitions
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentCommunity	17
Total acquisition cost	$ 36,100				$ 436,816
Form of Consideration
Cash					92,599
Units					217,513
Other					126,704
Investment Allocation
Land			$ 45,580		45,580
Building			375,985		375,985
Intangible Assets			17,604		17,604
Other			(2,353)		$ (2,353)
2021 Quarterly Acquisitions
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost			359,900
Union Pointe Apartment Homes - Longmont, CO
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					256
Total acquisition cost					$ 76,900
Form of Consideration
Cash					76,900
Units					0
Other					0
Investment Allocation
Land			5,727		5,727
Building			69,966		69,966
Intangible Assets			1,207		1,207
Other			0		$ 0
Bayberry Place - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					120
Total acquisition cost					$ 16,673
Form of Consideration
Cash					898
Units					9,855
Other					5,920
Investment Allocation
Land			1,807		1,807
Building			14,113		14,113
Intangible Assets			753		753
Other			0		$ 0
Burgandy & Hillsboro Court - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					251
Total acquisition cost					$ 35,569
Form of Consideration
Cash					2,092
Units					22,542
Other					10,935
Investment Allocation
Land			2,834		2,834
Building			31,148		31,148
Intangible Assets			1,587		1,587
Other			0		$ 0
Venue on Knox - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					97
Total acquisition cost					$ 18,896
Form of Consideration
Cash					500
Units					11,375
Other					7,021
Investment Allocation
Land			3,438		3,438
Building			14,743		14,743
Intangible Assets			715		715
Other			0		$ 0
Gatewood - St. Cloud, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					120
Total acquisition cost					$ 7,781
Form of Consideration
Cash					378
Units					3,388
Other					4,015
Investment Allocation
Land			327		327
Building			6,858		6,858
Intangible Assets			596		596
Other			0		$ 0
Grove Ridge - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					84
Total acquisition cost					$ 12,060
Form of Consideration
Cash					121
Units					8,579
Other					3,360
Investment Allocation
Land			1,250		1,250
Building			10,271		10,271
Intangible Assets			539		539
Other			0		$ 0
The Legacy - St. Cloud, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					119
Total acquisition cost					$ 10,560
Form of Consideration
Cash					229
Units					5,714
Other					4,617
Investment Allocation
Land			412		412
Building			9,556		9,556
Intangible Assets			592		592
Other			0		$ 0
New Hope Garden & Village - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					151
Total acquisition cost					$ 15,006
Form of Consideration
Cash					1,435
Units					10,812
Other					2,759
Investment Allocation
Land			1,603		1,603
Building			12,578		12,578
Intangible Assets			825		825
Other			0		$ 0
Palisades - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					330
Total acquisition cost					$ 53,354
Form of Consideration
Cash					2,884
Units					30,470
Other					20,000
Investment Allocation
Land			6,919		6,919
Building			46,577		46,577
Intangible Assets			2,211		2,211
Other			(2,353)		$ (2,353)
Plymouth Pointe - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					96
Total acquisition cost					$ 14,450
Form of Consideration
Cash					370
Units					9,061
Other					5,019
Investment Allocation
Land			1,042		1,042
Building			12,809		12,809
Intangible Assets			599		599
Other			0		$ 0
Pointe West - St. Cloud, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					93
Total acquisition cost					$ 7,558
Form of Consideration
Cash					91
Units					3,605
Other					3,862
Investment Allocation
Land			246		246
Building			6,849		6,849
Intangible Assets			463		463
Other			0		$ 0
River Pointe - Minneapolis MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					301
Total acquisition cost					$ 38,348
Form of Consideration
Cash					2,249
Units					21,653
Other					14,446
Investment Allocation
Land			3,346		3,346
Building			33,117		33,117
Intangible Assets			1,885		1,885
Other			0		$ 0
Southdale Parc - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					70
Total acquisition cost					$ 9,670
Form of Consideration
Cash					165
Units					7,907
Other					1,598
Investment Allocation
Land			1,569		1,569
Building			7,740		7,740
Intangible Assets			361		361
Other			0		$ 0
Portage - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					62
Total acquisition cost					$ 9,171
Form of Consideration
Cash					323
Units					5,588
Other					3,260
Investment Allocation
Land			2,133		2,133
Building			6,685		6,685
Intangible Assets			353		353
Other			0		$ 0
Windsor Gates - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					200
Total acquisition cost					$ 22,231
Form of Consideration
Cash					1,122
Units					12,080
Other					9,029
Investment Allocation
Land			2,140		2,140
Building			18,943		18,943
Intangible Assets			1,148		1,148
Other			0		$ 0
Wingate - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					136
Total acquisition cost					$ 15,784
Form of Consideration
Cash					723
Units					10,246
Other					4,815
Investment Allocation
Land			1,480		1,480
Building			13,530		13,530
Intangible Assets			774		774
Other			0		$ 0
Woodhaven - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					178
Total acquisition cost					$ 25,009
Form of Consideration
Cash					1,682
Units					15,200
Other					8,127
Investment Allocation
Land			3,940		3,940
Building			20,080		20,080
Intangible Assets			989		989
Other			0		$ 0
Woodland Pointe - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes acquired | apartmentHome					288
Total acquisition cost					$ 47,796
Form of Consideration
Cash					437
Units					29,438
Other					17,921
Investment Allocation
Land			5,367		5,367
Building			40,422		40,422
Intangible Assets			2,007		2,007
Other			$ 0		$ 0