EQUITY AWARDS - Schedule of Nonvested 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)	251,120	331,560	331,560
Granted (in shares)	39,000	35,000
Vested (in shares)	(53,340)	(54,340)
Forfeited (in shares)	(32,600)	(23,600)
Balance (in shares)	204,180	288,620	251,120	331,560
Weighted-Average Exercise Price
Outstanding at beginning of year (in USD per share)	$ 28.18	$ 27.74	$ 27.74
Granted (in USD per share)	27.43	29.85
Vested (in USD per share)	27.79	28.10
Forfeited (in USD per share)	29.68	33.03
Balance (in USD per share)	$ 27.98	$ 27.78	$ 28.18	$ 27.74
Weighted-Average Remaining Contractual Life in Years
Outstanding	6 years 10 months 13 days	7 years 1 month 28 days	7 years 3 months 21 days	7 years 9 months 7 days
Granted	9 years 6 months 3 days	9 years 7 months 9 days
Vested	6 years 6 months 18 days	7 years 5 months 23 days
Forfeited	8 years 1 month 13 days	9 years 2 months 4 days
Aggregate Intrinsic Value
Outstanding	$ 1,188	$ 975	$ 975
Granted	24	26
Vested	28	172
Forfeited	24	46
Outstanding	$ 60	$ 949	$ 1,188	$ 975