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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance $ (1,980) $ (2,182)
Change during the period ended March 31, 2018:    
Before-tax amount (3) 67
Tax provision 1 (23)
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 34 29
Net realized loss (gain) [2] 18 (8)
Total activity for the period 50 65
Balance (1,930) (2,117)
Pension Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (1,936) (2,151)
Change during the period ended March 31, 2018:    
Before-tax amount 0 0
Tax provision 0 0
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 34 29
Net realized loss (gain) [2] 0 0
Total activity for the period 34 29
Balance (1,902) (2,122)
Unrealized Gain (loss) On Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (44) (31)
Change during the period ended March 31, 2018:    
Before-tax amount (3) 67
Tax provision 1 (23)
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 0 0
Net realized loss (gain) [2] 18 (8)
Total activity for the period 16 36
Balance $ (28) $ 5
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.