LOANS RECEIVABLE AND OTHER INVESTMENTS - Composition of Loans Receivable and Other Investments (Details) $ in Thousands	Sep. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($)
Loans Receivable:
Quantity \| loan	22
Loans receivable	$ 89,767	$ 91,280
Book Value	$ 64,504	66,004
Weighted Average Contractual Interest Rate / Rate of Return	8.80%
Weighted Average Annualized Effective Interest Rate / Rate of Return	10.10%
Loan loss reserve	$ (1,249)	(97)
Loans receivable, net amount	$ 63,255	65,907
Other Investments:
Quantity \| loan	11
Principal Balance	$ 46,616	48,035
Book Value	$ 47,096	48,483
Weighted Average Contractual Interest Rate / Rate of Return	12.10%
Weighted Average Annualized Effective Interest Rate / Rate of Return	12.10%
Total Quantity \| loan	33
Total Principal Balance	$ 136,383
Total Book Value	$ 110,351	114,390
Total Weighted Average Contractual Interest Rate / Rate of Return	9.90%
Total Weighted Average Annualized Effective Interest Rate / Rate of Return	10.90%
Mortgage
Loans Receivable:
Quantity \| loan	1
Loans receivable	$ 16,525
Book Value	$ 16,525	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	$ 4,266
Book Value	$ 4,329	2,733
Weighted Average Contractual Interest Rate / Rate of Return	8.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	7.70%
Mezzanine
Loans Receivable:
Quantity \| loan	1
Loans receivable	$ 25,000
Book Value	$ 2,291	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	9.00%
Other
Loans Receivable:
Quantity \| loan	17
Loans receivable	$ 41,619
Book Value	$ 39,002	$ 38,324
Weighted Average Contractual Interest Rate / Rate of Return	7.70%
Weighted Average Annualized Effective Interest Rate / Rate of Return	8.60%

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Sum of the carrying amounts as of the balance sheet date of all investments.

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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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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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