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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Other Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Finite-lived Intangible Assets [Roll Forward]        
Beginning of period $ 4,800 $ 6,160 $ 5,458 $ 7,180
Amortization expense (314) (357) (972) (1,224)
Impairment 0 0 0 (153)
Balance, end of period $ 4,486 $ 5,803 $ 4,486 $ 5,803