LOANS RECEIVABLE AND OTHER INVESTMENTS - Narrative (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) loan investment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal balance	$ 351,463,000		$ 352,159,000
Book value	340,824,000		342,031,000
Increase (decrease) in the allowance for loan losses	500,000	$ 1,900,000
Allowance for loan losses	6,851,000		$ 6,344,000
Future funding on investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Future funding commitment	$ 58,900,000
Number of preferred equity investments for funding commitment | investment	1
Number of loan receivable investments for funding commitment | investment	2
Receivables with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans receivable considered to have deteriorated credit quality | loan	4		4
Principal balance	$ 1,700,000		$ 1,800,000
Book value	$ 100,000		$ 200,000
Nonaccrual status
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans receivable on nonaccrual status | loan	3		3
Book value of loans receivable on nonaccrual status	$ 0		$ 0