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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details)
 12 Months Ended
Dec. 31, 2019
Deposit premiums  
Finite-Lived Intangible Assets [Line Items]  
Estimated life 10 years
Minimum | Customer lists  
Finite-Lived Intangible Assets [Line Items]  
Estimated life 10 years
Maximum | Customer lists  
Finite-Lived Intangible Assets [Line Items]  
Estimated life 15 years