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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 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 (10) 45
Tax provision 2 (16)
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 19 15
Net realized loss (gain) [2] 15 (7)
Total activity for the period 26 37
Balance (1,954) (2,145)
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] 19 15
Net realized loss (gain) [2] 0 0
Total activity for the period 19 15
Balance (1,917) (2,136)
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 (10) 45
Tax provision 2 (16)
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 0 0
Net realized loss (gain) [2] 15 (7)
Total activity for the period 7 22
Balance $ (37) $ (9)
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.