STOCK OPTIONS - Schedule of Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Outstanding at beginning of year (in shares)	537,872	469,044	469,044
Granted (in shares)	23,000	59,000
Exercised (in shares)	(19,172)	(2,000)
Forfeited (in shares)	(17,400)	(1,600)
Balance (in shares)	524,300	524,444	537,872	469,044
Exercisable
Outstanding (in shares)	224,080	166,384
Weighted-average exercise price (in USD per share)	$ 24.90	$ 23.95
Weighted-average remaining contractual life in years	5 years 5 months 23 days	5 years 10 months 20 days
Aggregate intrinsic value	$ 1,419	$ 1,496
Weighted-Average Exercise Price
Outstanding at beginning of year (in USD per share)	$ 26.49	$ 25.11	$ 25.11
Granted (in USD per share)	29.77	32.66
Exercised (in USD per share)	25.08	23.00
Forfeited (in USD per share)	28.73	23.00
Balance (in USD per share)	$ 26.61	$ 25.97	$ 26.49	$ 25.11
Weighted-Average Remaining Contractual Life in Years
Outstanding	6 years 6 months 25 days	7 years 2 months 1 day	6 years 11 months 15 days	7 years 3 months 25 days
Granted	9 years 8 months 8 days	9 years 10 months 2 days
Exercised	5 years 10 months 24 days	6 years 9 months 18 days
Forfeited	8 years 2 months 15 days	6 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding	$ 2,088	$ 2,623	$ 2,623
Granted	32	24
Exercised	116	20
Forfeited	52	16
Outstanding	$ 2,506	$ 3,661	$ 2,088	$ 2,623