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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Core Deposit Intangible (Details) - Core Deposits [Member]
12 Months Ended
Dec. 31, 2020
Minimum  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 7 years
Maximum  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 10 years