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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Premises and Equipment (Details)
12 Months Ended
Dec. 31, 2020
Building [Member] | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 27 years 6 months
Furniture and Fixtures [Member] | Minimum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 3 years
Furniture and Fixtures [Member] | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 7 years
Leasehold Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives Shorter of useful lives or the terms of the leases