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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance $ (1,980) [1] $ (2,182)
Change during the period ended September 30, 2018:    
Before-tax amount (15) 108
Tax provision 3 (38)
Reclassification adjustment, net of taxes    
Amortization of net loss [2] 51 44
Net realized loss (gain) [3] 28 (25)
Total activity for the period 67 89
Balance (1,913) (2,093)
Pension Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (1,936) (2,151)
Change during the period ended September 30, 2018:    
Before-tax amount 0 0
Tax provision 0 0
Reclassification adjustment, net of taxes    
Amortization of net loss [2] 51 44
Net realized loss (gain) [3] 0 0
Total activity for the period 51 44
Balance (1,885) (2,107)
Unrealized Loss On Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (44) (31)
Change during the period ended September 30, 2018:    
Before-tax amount (15) 108
Tax provision 3 (38)
Reclassification adjustment, net of taxes    
Amortization of net loss [2] 0 0
Net realized loss (gain) [3] 28 (25)
Total activity for the period 16 45
Balance $ (28) $ 14
[1] (Note 1)
[2] Reported as part of selling, general and administrative expenses.
[3] Reported as part of interest income.