EQUITY AWARDS - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Outstanding at beginning of year (in shares)	508,000	537,872	537,872
Granted (in shares)	39,000	35,000
Exercised (in shares)	(3,000)	(22,172)
Forfeited (in shares)	(37,600)	(26,400)
Balance (in shares)	506,400	524,300	508,000	537,872
Exercisable
Outstanding (in shares)	302,220	235,680
Weighted-average exercise price (in USD per share)	$ 25.55	$ 25.22
Weighted-average remaining contractual life in years	4 years 9 months 7 days	5 years 5 months 1 day
Aggregate intrinsic value	$ 244	$ 1,307
Weighted-Average Exercise Price
Outstanding at beginning of year (in USD per share)	$ 26.68	$ 26.49	$ 26.49
Granted (in USD per share)	27.43	29.85
Exercised (in USD per share)	24.00	24.93
Forfeited (in USD per share)	29.68	29.53
Balance (in USD per share)	$ 26.53	$ 26.63	$ 26.68	$ 26.49
Weighted-Average Remaining Contractual Life in Years
Outstanding	5 years 7 months 13 days	6 years 4 months 17 days	6 years 2 months 26 days	6 years 11 months 15 days
Granted	9 years 6 months 3 days	9 years 7 months 9 days
Exercised	2 years 14 days	5 years 3 months 14 days
Forfeited	8 years 1 month 13 days	8 years 2 months 12 days
Aggregate Intrinsic Value
Outstanding	$ 3,159	$ 2,088	$ 2,088
Granted	24	26
Exercised	3	125
Forfeited	24	46
Outstanding	$ 304	$ 2,255	$ 3,159	$ 2,088