LOANS RECEIVABLE AND OTHER INVESTMENTS - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal balance	$ 66,316,000		$ 66,316,000		$ 67,527,000
Book value	62,363,000		62,363,000		63,634,000
Increase (decrease) in the allowance for loan losses	(100,000)	$ 100,000	700,000	$ 200,000
Allowance for loan losses	$ 1,287,000		$ 1,287,000		$ 564,000
Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans receivable considered to be impaired | loan					0
Number of loans receivable on nonaccrual status | loan	2		2		2
Book value of loans receivable on nonaccrual status	$ 0		$ 0		$ 0
Portfolio-Based Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in the allowance for loan losses		200,000
Allowance for loan losses					600,000
Specific Loans | Nonperforming Financial Instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses					$ 0
Provision recorded for specific loan losses		$ 0		$ 1,200,000
Receivables Acquired with Deteriorated Credit Quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans receivable considered to be impaired | loan	4		4		4
Principal balance	$ 2,200,000		$ 2,200,000		$ 2,300,000
Book value	$ 600,000		$ 600,000		$ 800,000