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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Details about Accumulated Other Comprehensive Income Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) $ 1,357 $ 1,233 $ 1,859 $ 2,267
Pension and other employee benefits 1,334 1,473 2,850 3,018
Net income 5,827 4,981 8,318 9,449
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 15 0 36 13
Accumulated Other Comprehensive Income (Loss) | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Debt and Equity Securities, Realized Gain (Loss) 0 (19) 0 (19)
Income tax expense (benefit) 0 5 0 5
Net income 0 (14) 0 (14)
Prior service costs | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Pension and other employee benefits (55) (55) (110) (110)
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Pension and other employee benefits 77 73 154 146
Accumulated Defined Benefit Plans Adjustment Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) (7) (4) (8) (9)
Net income $ 15 $ 14 $ 36 $ 27