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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Premises and Equipment (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Buildings    
Property, Plant and Equipment [Line Items]    
Estimated useful life 40 years  
Leases | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 3 years  
Leases | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 7 years  
Furniture, Fixtures, And Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life   3 years
Furniture, Fixtures, And Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life   7 years