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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of accumulated other comprehensive (loss) income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance $ (1,980) $ (2,182)
Change during period:    
Before-tax amount (410) 250
Tax benefit (expense) 89 (88)
Reclassification adjustment, net of taxes    
Amortization of net loss 63 59
Net realized gain (loss) 63 (19)
Total activity in period (195) 202
Balance (2,175) (1,980)
Pension Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (1,936) (2,151)
Change during period:    
Before-tax amount (390) 241
Tax benefit (expense) 85 (85)
Reclassification adjustment, net of taxes    
Amortization of net loss 63 59
Net realized gain (loss) 0 0
Total activity in period (242) 215
Balance (2,178) (1,936)
Unrealized Loss on Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (44) (31)
Change during period:    
Before-tax amount (20) 9
Tax benefit (expense) 4 (3)
Reclassification adjustment, net of taxes    
Amortization of net loss 0 0
Net realized gain (loss) 63 (19)
Total activity in period 47 (13)
Balance $ 3 $ (44)