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GOODWILL AND INTANGIBLE ASSETS - Schedule of Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract]      
Finite-Lived Intangible Assets, Net, Beginning Balance $ 356 $ 458 $ 207
Amortization expense (286) (102) (99)
Finite-Lived Intangible Assets, Net, Ending Balance 3,910 356 458
Core Deposit Intangibles      
Finite-Lived Intangible Assets, Net [Abstract]      
Finite-lived Intangible Assets Acquired 3,840 0 0
Other Customer Relationships Intangibles      
Finite-Lived Intangible Assets, Net [Abstract]      
Finite-lived Intangible Assets Acquired $ 0 $ 0 $ 350