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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Interest Bearing Deposits in Banks (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Interest bearing deposits in banks $ 7,718 $ 1,739
Interest bearing deposits in banks, yield (as a percent) 2.54% 1.99%
Interest bearing deposits in banks, term, low end of range 1 year  
Interest bearing deposits in banks, term, high end of range 6 years