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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income Loss [Roll Forward]        
Balance     $ (1,901) $ (1,969)
Change during period:        
Before-tax amount     90 66
Tax provision/benefit     (32) (24)
Reclassification adjustment, net of taxes        
Amortization of net loss [1]     41 36
Net realized gain $ 16 $ 12 (19) [2] (28) [2]
Total activity for the period     80 50
Balance (1,821) (1,919) (1,821) (1,919)
Pension Adjustment        
Accumulated Other Comprehensive Income Loss [Roll Forward]        
Balance     (1,899) (2,024)
Change during period:        
Before-tax amount    
Tax provision/benefit    
Reclassification adjustment, net of taxes        
Amortization of net loss [1]     41 36
Net realized gain [2]    
Total activity for the period     41 36
Balance (1,858) (1,988) (1,858) (1,988)
Unrealized Gain on Securities        
Accumulated Other Comprehensive Income Loss [Roll Forward]        
Balance     (2) 55
Change during period:        
Before-tax amount     90 66
Tax provision/benefit     (32) (24)
Reclassification adjustment, net of taxes        
Amortization of net loss    
Net realized gain [2]     (19) (28)
Total activity for the period     39 14
Balance $ 37 $ 69 $ 37 $ 69
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.