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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance $ (2,182) $ (1,901)
Change during period:    
Before-tax amount 108 90
Tax provision (38) (32)
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 44 41
Net realized gain [2] (25) (19)
Total activity for the period 89 80
Balance (2,093) (1,821)
Pension Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (2,151) (1,899)
Change during period:    
Before-tax amount 0 0
Tax provision 0 0
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 44 41
Net realized gain [2] 0 0
Total activity for the period 44 41
Balance (2,107) (1,858)
Unrealized Gain (loss) On Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (31) (2)
Change during period:    
Before-tax amount 108 90
Tax provision (38) (32)
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 0 0
Net realized gain [2] (25) (19)
Total activity for the period 45 39
Balance $ 14 $ 37
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.