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ACCUMULATED OTHER COMPREHENSIVE LOSS - Details about Accumulated Other Comprehensive Income Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gains on security transactions $ 19 $ 0 $ 19 $ 0
Income tax expense (benefit) 1,233 486 2,267 1,547
Pension and other employee benefits 1,473 1,518 3,018 3,176
Net income 4,981 2,527 9,449 6,966
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 0 14 13 27
Unrealized Gains and Losses on Securities Available for Sale | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gains on security transactions (19) 0 (19) 0
Income tax expense (benefit) 5 0 5 0
Net income (14) 0 (14) 0
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 73 73 146 146
Defined Benefit and Other Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) (4) (4) (9) (9)
Net income $ (14) $ (14) $ 27 $ 27