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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance $ (2,182) $ (1,901)
Change during period:    
Before-tax amount 67 165
Tax provision/benefit (23) (64)
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 29 27
Net realized gain [2] (8) 14
Total activity for the period 65 142
Balance (2,117) (1,759)
Pension Adjustment    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance (2,151) (1,899)
Change during period:    
Before-tax amount
Tax provision/benefit
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 29 27
Net realized gain [2]
Total activity for the period 29 27
Balance (2,122) (1,872)
Unrealized Gain (loss) On Securities    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance (31) (2)
Change during period:    
Before-tax amount 67 193
Tax provision/benefit (23) (69)
Reclassification adjustment, net of taxes    
Amortization of net loss [1]
Net realized gain [2] (8) (9)
Total activity for the period 36 115
Balance $ 5 $ 113
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.