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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income Loss [Roll Forward]        
Balance     $ (1,901) $ (1,969)
Change during period:        
Before-tax amount     165 (96)
Tax provision/benefit     (64) 34
Reclassification adjustment, net of taxes        
Amortization of net loss [1]     27 24
Net realized gain $ 14 $ 11 14 [2] 32 [2]
Total activity for the period     142 (6)
Balance (1,759) (1,975) (1,759) (1,975)
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]     27 24
Net realized gain [2]    
Total activity for the period     27 24
Balance (1,872) (2,000) (1,872) (2,000)
Unrealized Gain on Securities        
Accumulated Other Comprehensive Income Loss [Roll Forward]        
Balance     (2) 55
Change during period:        
Before-tax amount     165 (96)
Tax provision/benefit     (64) 34
Reclassification adjustment, net of taxes        
Amortization of net loss [1]    
Net realized gain [2]     14 32
Total activity for the period     115 (30)
Balance $ 113 $ 25 $ 113 $ 25
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.