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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Premises and Equipment (Details)
12 Months Ended
Dec. 31, 2021
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