EQUITY AWARDS - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Outstanding at beginning of year (in shares)	506,200	508,000	508,000
Effect of 10% stock dividend (in shares)	50,770
Granted (in shares)	24,500	35,000
Exercised (in shares)	(28,590)	(3,000)
Forfeited (in shares)	(19,020)	(28,200)
Balance (in shares)	533,860	511,800	506,200	508,000
Exercisable
Outstanding (in shares)	312,206	284,620
Weighted-average exercise price (in USD per share)	$ 23.58	$ 25.28
Weighted-average remaining contractual life in years	4 years 5 months 26 days	4 years 10 months 17 days
Aggregate intrinsic value	$ 3,274	$ 438
Weighted-Average Exercise Price
Outstanding at beginning of year (in USD per share)	$ 26.81	$ 26.68	$ 26.68
Granted (in USD per share)	33.37	27.64
Exercised (in USD per share)	22.28	24.00
Forfeited (in USD per share)	26.01	31.93
Balance (in USD per share)	$ 24.84	$ 26.47	$ 26.81	$ 26.68
Weighted-Average Remaining Contractual Life in Years
Outstanding	5 years 6 months 29 days	5 years 10 months 24 days	5 years 9 months 25 days	6 years 2 months 26 days
Granted	9 years 7 months 9 days	9 years 8 months 19 days
Exercised	3 years 4 months 17 days	2 years 3 months 14 days
Forfeited	7 years 1 month 2 days	8 years 1 month 28 days
Aggregate Intrinsic Value
Outstanding	$ 1,805	$ 3,159	$ 3,159
Granted	22	41
Exercised	337	6
Forfeited	153
Outstanding	$ 4,930	$ 607	$ 1,805	$ 3,159