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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of accumulated other comprehensive (loss) income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance $ (2,182) $ (1,901)
Change during period:    
Before-tax amount 250 (557)
Tax benefit (expense) (88) 197
Reclassification adjustment, net of taxes    
Amortization of net loss 59 54
Net realized gain (loss) (19) 25
Total activity in period 202 (281)
Balance (1,980) (2,182)
Pension Adjustment    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance (2,151) (1,899)
Change during period:    
Before-tax amount 241 (474)
Tax benefit (expense) (85) 168
Reclassification adjustment, net of taxes    
Amortization of net loss 59 54
Net realized gain (loss) 0 0
Total activity in period 215 (252)
Balance (1,936) (2,151)
Unrealized Loss on Securities    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance (31) (2)
Change during period:    
Before-tax amount 9 (83)
Tax benefit (expense) (3) 29
Reclassification adjustment, net of taxes    
Amortization of net loss 0 0
Net realized gain (loss) (19) 25
Total activity in period (13) (29)
Balance $ (44) $ (31)