STOCK OPTIONS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Mar. 24, 2017	Aug. 27, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	70,000	38,750	70,000	0	38,750
Granted (in dollars per share)	$ 44.21	$ 42.03	$ 44.21	$ 0.00	$ 42.03
Vesting period (in years)		5 years
Expiration period (in years)		10 years
Options outstanding (in shares)		26,500	93,500	26,500	34,750	0
Allocated share-based compensation expense			$ 29	$ 19
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		5 years
Expiration period (in years)		10 years
Nonvested awards, compensation cost not yet recognized			$ 99
Period for recognition (in years)			2 years 10 months 28 days
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	46,250		46,250
Granted (in dollars per share)	$ 44.21
Vesting period (in years)	3 years
Expiration period (in years)	10 years
Options outstanding (in shares)	43,250
Tranche One | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	23,750		23,750
Granted (in dollars per share)	$ 44.21
Vesting period (in years)	5 years
Expiration period (in years)	10 years
Options outstanding (in shares)	23,750
Tranche Two | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			5 years