LOANS HELD-FOR-INVESTMENT (Activity) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Loans Held-for-Investment [Roll Forward]
Beginning Balance, Principal Balance	$ 300,135,000
Beginning Balance, Deferred Fees/Other Items	(6,047,000)
Beginning Balance, Loan Fees Receivable	7,542,000
Beginning Balance, Net Book Value	301,630,000
Loan fundings, Principal Balance	409,558,000
Loan fundings, Deferred Fees/Other items	(5,000)
Loan fundings, Loan Fees Receivable	5,000
Loan fundings, Net Book Value	409,558,000
Gross sale price	(20,373,000)
Sale of loans, Deferred Fees/Other Items	754,000
Sale of loans, Principal Balance	(19,619,000)
Principal repayments received	(63,592,000)
Capitalized interest	539,000
Deferred fees and other items, Deferred Fees/Other Items	(3,688,000)
Deferred fees and other items, Loan Fees Receivable	(380,000)
Deferred fees and other items, Net Book Value	(4,068,000)
Accretion and amortization of fees and other items	1,631,000
Allowance for credit losses	(27,684,000)	$ (19,779,000)	$ 0
Ending Balance, Principal Balance	626,267,000
Ending Balance, Deferred Fees/Other Items	(35,039,000)
Ending Balance, Loan Fees Receivable	7,167,000
Ending Balance, Net Book Value	598,395,000
Total CRE loans-held-for-investment and related receivables, net
Loans Held-for-Investment [Roll Forward]
Beginning Balance, Net Book Value	298,880,000
Ending Balance, Net Book Value	232,007,000
Senior loan
Loans Held-for-Investment [Roll Forward]
Repayments of debt	$ 40,100,000