EQUITY AWARDS - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 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)	35,000	23,000
Exercised (in shares)	(3,000)	(19,172)
Forfeited (in shares)	(28,200)	(17,400)
Balance (in shares)	511,800	524,300	508,000	537,872
Exercisable
Outstanding (in shares)	284,620	224,080
Weighted-average exercise price (in USD per share)	$ 25.28	$ 24.90
Weighted-average remaining contractual life in years	4 years 10 months 17 days	5 years 5 months 23 days
Aggregate intrinsic value	$ 438	$ 1,419
Weighted-Average Exercise Price
Outstanding at beginning of year (in USD per share)	$ 26.68	$ 26.49	$ 26.49
Granted (in USD per share)	27.64	29.77
Exercised (in USD per share)	24.00	25.08
Forfeited (in USD per share)	31.93	28.73
Balance (in USD per share)	$ 26.47	$ 26.61	$ 26.68	$ 26.49
Weighted-Average Remaining Contractual Life in Years
Outstanding	5 years 10 months 24 days	6 years 6 months 25 days	6 years 2 months 26 days	6 years 11 months 15 days
Granted	9 years 8 months 19 days	9 years 8 months 8 days
Exercised	2 years 3 months 14 days	5 years 10 months 24 days
Forfeited	8 years 1 month 28 days	8 years 2 months 15 days
Aggregate Intrinsic Value
Outstanding	$ 3,159	$ 2,088	$ 2,088
Granted	41	32
Exercised	6	116
Forfeited	0	52
Outstanding	$ 607	$ 2,506	$ 3,159	$ 2,088