LOANS RECEIVABLE AND OTHER INVESTMENTS - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) investment loan	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) investment loan	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal balance	$ 351,774,000		$ 351,774,000		$ 352,159,000
Book value	341,533,000		341,533,000		342,031,000
(Decrease) increases in the allowance for loan losses	(200,000)	$ 0	100,000	$ 1,800,000
Allowance for loan losses	$ 6,427,000		$ 6,427,000		$ 6,344,000
Nonaccrual status
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans receivable on nonaccrual status | loan	3		3		3
Book value of loans receivable on nonaccrual status	$ 0		$ 0		$ 0
Receivables with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans receivable considered to have deteriorated credit quality | loan	3		3		3
Principal balance	$ 1,600,000		$ 1,600,000		$ 1,700,000
Book value	8,000		8,000		$ 100,000
Future funding on investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Future funding commitment	$ 72,300,000		$ 72,300,000
Number of preferred equity investments for funding commitment | investment	3		3
Number of loan receivable investments for funding commitment | investment	2		2