LOANS RECEIVABLE AND OTHER INVESTMENTS - Composition of Loans Receivable and Other Investments (Details) $ in Thousands	Jun. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($)
Loans Receivable:
Quantity \| loan	22
Loans receivable	$ 80,687	$ 91,280
Book Value	$ 56,236	66,004
Weighted Average Contractual Interest Rate / Rate of Return	9.30%
Weighted Average Annualized Effective Interest Rate / Rate of Return	10.90%
Loan loss reserve	$ (356)	(97)
Loans receivable, net amount	$ 55,880	65,907
Other Investments:
Quantity \| loan	13
Principal Balance	$ 50,856	48,035
Book Value	$ 51,348	48,483
Weighted Average Contractual Interest Rate / Rate of Return	12.60%
Weighted Average Annualized Effective Interest Rate / Rate of Return	12.60%
Total Quantity \| loan	35
Total Principal Balance	$ 131,543
Total Book Value	$ 107,228	114,390
Total Weighted Average Contractual Interest Rate / Rate of Return	10.60%
Total Weighted Average Annualized Effective Interest Rate / Rate of Return	11.70%
Mortgage
Loans Receivable:
Quantity \| loan	1
Loans receivable	$ 15,332
Book Value	$ 15,332	12,351
Weighted Average Contractual Interest Rate / Rate of Return	10.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	10.00%
Construction
Loans Receivable:
Quantity \| loan	2
Loans receivable	$ 3,989
Book Value	$ 4,055	2,733
Weighted Average Contractual Interest Rate / Rate of Return	8.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	7.80%
Mezzanine
Loans Receivable:
Quantity \| loan	1
Loans receivable	$ 25,000
Book Value	$ 2,301	10,239
Weighted Average Contractual Interest Rate / Rate of Return	10.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	41.90%
Pre-development
Loans Receivable:
Quantity \| loan	1
Loans receivable	$ 2,357
Book Value	$ 2,357	2,357
Weighted Average Contractual Interest Rate / Rate of Return	9.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	8.40%
Other
Loans Receivable:
Quantity \| loan	17
Loans receivable	$ 34,009
Book Value	$ 32,191	$ 38,324
Weighted Average Contractual Interest Rate / Rate of Return	8.50%
Weighted Average Annualized Effective Interest Rate / Rate of Return	9.70%

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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