MORTGAGE LOANS RECEIVABLE - Summary of the Geographic Distribution of Mortgage Loans Receivable (Details) - Mortgage Loans Receivable - Geographic Concentration Risk - Loan Origination Commitments	9 Months Ended
	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	100.00%
California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	49.20%
Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	8.70%
New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	7.00%
Colorado
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	5.60%
Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	5.20%
Arizona
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	4.20%
Virginia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	3.80%
North Carolina
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	2.50%
Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	2.40%
Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	2.30%
Other U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Total Loan Commitment	9.10%