MORTGAGE LOANS, NET - Loan Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Movement in Mortgage Loans On Real Estate Principal Amount [Roll Forward]
Principal Outstanding, Beginning Balances	$ 35,514	$ 31,820
Principal Outstanding, Additions:
Mortgage loan originated		3,000
Construction loan draws	4,639
Accretion of mortgage income	55	748
Accretion of origination fees		16
Accrued interest revenue	0	0
Principal Outstanding, Reductions:
Mortgage loan origination fee		(70)
Principal foreclosure	(8,006)
Non-cash provision for credit losses	(2,598)
Mortgage loan sale	(9,653)
Principal and interest repayments	(7,639)	0
Principal Outstanding, Ending Balances	12,312	35,514
Movement in Mortgage Loans On Real Estate Interest Receivable [Roll Forward]
Interest Receivable, Beginning Balances	783	530
Additions, Interest Receivable:
Mortgage loan originated		0
Construction loan draws	0
Accretion of mortgage income	0	0
Accretion of origination fees		0
Accrued interest revenue	1,645	2,190
Reductions, Interest Receivable:
Mortgage loan origination fee
Principal foreclosure	(750)
Non-cash provision for credit losses	0
Mortgage loan sale	0
Principal and interest repayments	(1,308)	(1,937)
Interest Receivable, Ending Balances	370	783
Movement in Allowance for Loan and Lease Losses, Real Estate [Roll Forward]
Valuation Allowance, Begining Balances	(13,063)	(12,682)
Valuation Allowance, Additions:
Mortgage loan originated		0
Construction loan draws	0
Accretion of mortgage income	0	(381)
Accretion of origination fees		0
Accrued interest revenue	0	0
Valuation Allowance, Reductions:
Mortgage loan origination fee		0
Principal foreclosure	381
Non-cash provision for credit losses	0
Mortgage loan sale	0
Principal and interest repayments	0	0
Valuation Allowance, Ending Balances	(12,682)	(13,063)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans, Beginning Balances, Carrying Value	23,234	19,668
Net Carrying Value, Additions :
Mortgage loan originated		3,000
Construction loan draws	4,639
Accretion of mortgage income	55	367
Accretion of origination fees		16
Accrued interest revenue	1,645	2,190
Net Carrying Value, Reductions :
Mortgage loan origination fee		(70)
Principal foreclosure	(8,375)
Non-cash provision for credit losses	(2,598)
Mortgage loan sale	(9,653)
Principal and interest repayments	(8,947)	(1,937)
Mortgage Loans, Ending Balances, Carrying Value	$ 0	$ 23,234