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GOODWILL AND INTANGIBLE ASSETS - Component of Other Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Core deposit intangibles $ 3,840  
Other customer relationship intangibles 931  
Total Gross Carrying Amount 4,771 $ 937
Accumulated Amortization 861 581
Core Deposit Intangibles    
Finite-Lived Intangible Assets [Line Items]    
Core deposit intangibles   0
Accumulated Amortization 190 0
Other Customer Relationships Intangibles    
Finite-Lived Intangible Assets [Line Items]    
Other customer relationship intangibles   937
Accumulated Amortization $ 671 $ 581