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GOODWILL AND INTANGIBLE ASSETS - Changes in Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Balance at beginning of period $ 35,466 $ 14,594
Acquired goodwill 3,372 20,872
Impairment 0  
Balance at end of period $ 38,838 $ 35,466