STOCK OPTIONS - Schedule of Nonvested Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Outstanding at beginning of year (in shares)	331,560	334,400
Granted (in shares)	39,000	101,000
Vested (in shares)	(91,040)	(88,440)
Forfeited (in shares)	(28,400)	(15,400)
Balance (in shares)	251,120	331,560	334,400
Weighted-Average Exercise Price
Outstanding at beginning of year (in USD per share)	$ 27.74	$ 25.72
Granted (in USD per share)	29.89	32.29
Vested (in USD per share)	26.71	25.51
Forfeited (in USD per share)	33.00	30.14
Balance (in USD per share)	$ 28.18	$ 27.74	$ 25.72
Weighted-Average Remaining Contractual Life in Years
Outstanding	7 years 3 months 21 days	7 years 9 months 7 days	7 years 10 months 28 days
Granted	9 years 4 months 24 days	9 years 6 months 3 days
Vested	6 years 7 days	6 years 8 months 8 days
Forfeited	8 years 9 months 21 days	7 years 9 months 3 days
Aggregate Intrinsic Value
Outstanding	$ 975	$ 1,673
Granted	117	5
Vested	563	400
Forfeited	89	96
Outstanding	$ 1,188	$ 975	$ 1,673