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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Goodwill [Roll Forward]    
Goodwill, beginning of year $ 12,592 $ 719
Acquired goodwill 7,029 11,873
Goodwill, ending of period $ 19,621 $ 12,592