STOCK BASED COMPENSATION PLANS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted			47,393
Options outstanding	47,393		47,393		0
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 26		$ 65
Options outstanding		0		0		0
Unrecognized compensation cost related to unvested stock options	244		$ 244
Cost is expected to be recognized period			2 years 4 months 24 days
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 612	$ 432	$ 1,900	$ 1,300
Number of restricted stock awards granted			83,282
Number of restricted stock awards granted	335,267		335,267		317,692
Unrecognized compensation cost related to non-vested RSAs	$ 5,700		$ 5,700
Cost is expected to be recognized period			3 years 4 months 24 days
Restricted stock | Time-vested RSAs vest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted	310,933		310,933
Restricted stock | Time-vested RSAs vest ratably over five years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			44,750
Vesting period (in years)			5 years
Restricted stock | Time-vested RSAs vest ratably over three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			13,415
Vesting period (in years)			3 years
Restricted stock | Performance-based RSAs vest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			25,117
Vesting period (in years)			2 years
Number of restricted stock awards granted	24,334		24,334
Directors | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			1 year
Deferred compensation expense	$ 143	135	$ 418	395
LTI Plan | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 121	$ 81	$ 341	$ 229
Number of restricted stock awards granted			21,693
Number of restricted stock awards granted	78,622		78,622		68,776
Unrecognized compensation cost related to non-vested RSAs	$ 1,400		$ 1,400
Cost is expected to be recognized period			3 years 2 months 12 days
LTI Plan | Restricted stock units | Time-vested RSAs vest ratably over five years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			12,522
Vesting period (in years)			5 years
LTI Plan | Restricted stock units | Performance-based RSAs vest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted			9,171
Vesting period (in years)			3 years
LTI Plan | NEOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted			47,393	0
Vesting period (in years)			3 years
Weighted-average grant-date fair value			$ 6.52
Method used			Black-Scholes option-pricing model
Dividend yield			2.80%
Expected volatility rate			27.53%
Risk-free interest rate			2.67%
Expected option life			6 years 6 months