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COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Sep. 30, 2018
USD ($)
Mar. 31, 2021
USD ($)
officer
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Commitment and Contingencies [Line Items]        
Outstanding loan commitments to fund loans   $ 60,000    
Future obligations under leases to fund tenant improvements and other future construction obligation   7,600    
Restricted cash   $ 9,891 $ 10,013 $ 10,430
Employment agreements | Executive Officers        
Commitment and Contingencies [Line Items]        
Number of officers covered under employment agreement | officer   1    
Multiplier used for the calculation of payments in the event of death of employee   2    
Multiplier used for the calculation of payments in the event of disability to employee   1    
Restricted Cash For Tenant Improvement Allowance        
Commitment and Contingencies [Line Items]        
Restricted cash   $ 2,500    
City and County of San Francisco Real Property Transfer Tax Case | Pending Litigation        
Commitment and Contingencies [Line Items]        
Refund sought for penalties, interest and legal fees paid for real property transfer tax $ 11,800