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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance $ (2,175) [1] $ (1,980)
Change during the period ended March 31, 2019:    
Before-tax amount 13 (10)
Tax provision (3) 2
Adoption of account standard (Note 2) (414)  
Reclassification adjustment, net of taxes    
Amortization of net loss [2] 17 19
Net realized loss (gain) [3] (3) 15
Total activity for the period (390) 26
Balance (2,565) (1,954)
Pension Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance (2,178) (1,936)
Change during the period ended March 31, 2019:    
Before-tax amount 0 0
Tax provision 0 0
Adoption of account standard (Note 2) (404)  
Reclassification adjustment, net of taxes    
Amortization of net loss [2] 17 19
Net realized loss (gain) [3] 0 0
Total activity for the period (387) 19
Balance (2,565) (1,917)
Unrealized Loss On Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance 3 (44)
Change during the period ended March 31, 2019:    
Before-tax amount 13 (10)
Tax provision (3) 2
Adoption of account standard (Note 2) (10)  
Reclassification adjustment, net of taxes    
Amortization of net loss [2] 0 0
Net realized loss (gain) [3] (3) 15
Total activity for the period (3) 7
Balance $ 0 $ (37)
[1] Note 1
[2] Reported as part of selling, general and administrative expenses.
[3] Reported as part of interest income.