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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Unfunded Loan Commitments      
Lease liabilities $ 16,233    
Operating lease, right-of-use asset $ 15,500    
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other liabilities    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets    
Operating expenses $ 500 $ 300  
Treasury bills traded and not yet settled 109,717 $ 0  
Provision for loan losses      
Unfunded Loan Commitments      
Unfunded commitments of mortgage loan receivables held for investment $ 289,800   $ 321,800
Length of additional mortgage loan financing 3 years    
Unfunded commitments of mortgage loan receivables held for investment, additional funds 54.00%    
U.S. Treasury Securities Traded, Not Yet Settled      
Unfunded Loan Commitments      
Treasury bills traded and not yet settled $ 109,700