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.

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Receivable and Notes Receivable (Details) - USD ($) $ in Thousands	1 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2021	Dec. 31, 2020
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE
Mortgage loans receivable at fair value			$ 37,457	$ 24,661
Minneapolis, Minnesota \| Construction Loans
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE
Accrued interest			560
Multi-Family Residential \| Ironwood Apartments - New Hope, MN \| Tax Increment Financing
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE
Interest rate	4.50%
Multi-Family Residential \| Minneapolis, Minnesota \| Construction Loans
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE
Interest rate		4.50%
Mortgage loans receivable at fair value		$ 29,900	29,900	24,700
Multi-Family Residential \| Minneapolis, Minnesota \| Mezzanine Loan
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE
Interest rate		11.50%
Mortgage loans receivable at fair value		$ 15,300	7,100
Multi Family Same-Store \| Ironwood \| Tax Increment Financing
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE
Loan commitment			$ 6,600	$ 6,600