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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Loans Receivable and Notes Receivable (Details) $ in Thousands	1 Months Ended		3 Months Ended	8 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($)	Aug. 31, 2017 USD ($) property	Jul. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Apr. 30, 2018 USD ($) property
Real Estate Properties [Line Items]
Mortgage loans receivable				$ 10,000			$ 10,000
Number of real estate properties sold | property								28
Discontinued Operations, Disposed of by Sale
Real Estate Properties [Line Items]
Interest income					$ 0			$ 661
MultiFamily Same-Store
Real Estate Properties [Line Items]
Loan commitment			$ 16,200
Interest rate on mortgages payable			6.00%
MultiFamily Same-Store | Mortgage Receivable
Real Estate Properties [Line Items]
Mortgage loans receivable		$ 11,000
MultiFamily Same-Store | Discontinued Operations, Disposed of by Sale
Real Estate Properties [Line Items]
Interest rate on mortgages payable		5.50%
Number of real estate properties sold | property		13
Interest income				448		$ 279	570	$ 372
MultiFamily Same-Store | Minneapolis, Minnesota
Real Estate Properties [Line Items]
Mortgage loans receivable				6,200		$ 24,700	6,200
MultiFamily Same-Store | Minneapolis, Minnesota | Construction Loans
Real Estate Properties [Line Items]
Loan commitment				29,900			$ 29,900
Interest rate on mortgages payable							4.50%
MultiFamily Same-Store | Minneapolis, Minnesota | Mezzanine Loan
Real Estate Properties [Line Items]
Loan commitment				$ 15,300			$ 15,300
Interest rate on mortgages payable							11.50%
MultiFamily Same-Store | Ironwood
Real Estate Properties [Line Items]
Loan commitment, additional funds authorized			$ 341
MultiFamily Same-Store | Ironwood | Tax Increment Financing
Real Estate Properties [Line Items]
Loan commitment	$ 6,600
Interest rate on mortgages payable	4.50%

X

- Definition

Loans And Leases Receivable, Loans In Process, Additional Funds

+ References

No definition available.

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- Definition

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+ References

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Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column B
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column B))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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Amount of undisbursed portion of financing receivable balance. Excludes financing receivable covered under loss sharing agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 220
-SubTopic 10
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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