CURRENT EXPECTED CREDIT LOSSES - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 19, 2024	Jun. 30, 2024	Jun. 12, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	$ 146,000
Allowance for credit loss (basis points)	6.61%
Commitments	$ 1,927,321				$ 2,274,584
Outstanding Principal	1,848,416				2,158,045
Other Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest receivable	9,700				13,000
Office | Senior Mortgage Loans | CA
Financing Receivable, Allowance for Credit Loss [Line Items]
Outstanding Principal				$ 33,200
Office | Senior Mortgage Loans | NJ | 5 - Impaired/Loss Likely: A loan that has significantly increased probability of default or principal loss
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	15,700
Office | Senior Mortgage Loans | NC
Financing Receivable, Allowance for Credit Loss [Line Items]
Outstanding Principal		$ 68,600
Office | Senior Mortgage Loans | NC | 5 - Impaired/Loss Likely: A loan that has significantly increased probability of default or principal loss
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	10,500
Industrial | Senior Mortgage Loans | CA | 5 - Impaired/Loss Likely: A loan that has significantly increased probability of default or principal loss | SOFR Plus 3.75% Due Jul 2025
Financing Receivable, Allowance for Credit Loss [Line Items]
Outstanding Principal	19,600
Multifamily | Senior Mortgage Loans | TX | 5 - Impaired/Loss Likely: A loan that has significantly increased probability of default or principal loss
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	60,400
Mixed-use | Senior Mortgage Loans | NC | 5 - Impaired/Loss Likely: A loan that has significantly increased probability of default or principal loss | SOFR Plus 3.75% Due Jul 2025
Financing Receivable, Allowance for Credit Loss [Line Items]
Outstanding Principal	162,600
Mixed-use | Senior Mortgage Loans | NY | 5 - Impaired/Loss Likely: A loan that has significantly increased probability of default or principal loss | SOFR Plus 3.75% Due Jul 2025
Financing Receivable, Allowance for Credit Loss [Line Items]
Outstanding Principal	77,200
Loans Held for Investment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	144,068		$ 137,403		159,885
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	$ 1,883		$ 1,087		$ 3,248