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SECURED BORROWINGS (Details)
1 Months Ended 12 Months Ended
Nov. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
loan
Apr. 30, 2019
USD ($)
extension
Dec. 31, 2020
USD ($)
loan
Apr. 30, 2020
extension
Feb. 28, 2020
USD ($)
Dec. 31, 2019
USD ($)
May 31, 2019
USD ($)
Debt Instrument [Line Items]                
Number of secured borrowing arrangements | loan       3        
Outstanding balance       $ 928,674,000     $ 894,744,000  
Notes Payable                
Debt Instrument [Line Items]                
Outstanding balance $ 23,500,000     $ 7,000,000.0        
Interest rate margin (as a percent)       3.75%        
Extension period of maturity date 12 months              
NORTH CAROLINA | Senior Mortgage Loans                
Debt Instrument [Line Items]                
Outstanding balance           $ 24,400,000    
Extension period of maturity date     12 months          
Number of extensions | extension     1          
NORTH CAROLINA | Notes Payable                
Debt Instrument [Line Items]                
Outstanding balance     $ 24,400,000         $ 40,500,000
Aggregate principal amount     30,500,000          
Multifamily | FLORIDA | Subordinated Participation                
Debt Instrument [Line Items]                
Outstanding balance       $ 24,900,000        
Multifamily | FLORIDA | Notes Payable                
Debt Instrument [Line Items]                
Outstanding balance     $ 6,100,000          
Multifamily | FLORIDA | Participating Mortgages                
Debt Instrument [Line Items]                
Outstanding balance   $ 66,900,000   91,800,000        
Interest rate margin (as a percent)   2.94%            
Multifamily | FLORIDA | Senior Mortgage Loan Purchased | Subordinated Participation                
Debt Instrument [Line Items]                
Interest rate margin (as a percent)   10.50%            
Multifamily | FLORIDA | Senior Mortgage Loan Purchased | Subordinated participation notes, one-month LIBOR Plus 10.50%                
Debt Instrument [Line Items]                
Outstanding balance   $ 12,600,000   12,600,000        
Extension period of maturity date   12 months            
Number of extensions | loan   1            
Multifamily | FLORIDA | Senior Mortgage Loan Purchased | Notes Payable                
Debt Instrument [Line Items]                
Outstanding balance       24,900,000        
Extension period of maturity date   12 months            
Number of extensions | extension         1      
Multifamily | FLORIDA | Senior Mortgage Loan Purchased | Participating Mortgages                
Debt Instrument [Line Items]                
Outstanding balance   $ 34,100,000   46,700,000        
Interest rate margin (as a percent)   2.94%            
Office | NORTH CAROLINA | Senior Mortgage Loan, Due May 5, 2023                
Debt Instrument [Line Items]                
Outstanding balance       $ 22,700,000        
Interest rate margin (as a percent)     2.50%