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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ (1,969) $ (853)
Change during period:    
Before-tax amount (96) 7
Tax provision/benefit 34 (4)
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 24 6
Net realized gain [2] 32 1
Total activity for the period (6) 10
Balance (1,975) (843)
Pension Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ (2,024) $ (990)
Change during period:    
Before-tax amount    
Tax provision/benefit    
Reclassification adjustment, net of taxes    
Amortization of net loss [1] $ 24 $ 6
Net realized gain [2]    
Total activity for the period $ 24 $ 6
Balance (2,000) (984)
Unrealized Gain on Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 55 137
Change during period:    
Before-tax amount (96) 7
Tax provision/benefit $ 34 $ (4)
Reclassification adjustment, net of taxes    
Amortization of net loss [1]    
Net realized gain [2] $ 32 $ 1
Total activity for the period (30) 4
Balance $ 25 $ 141
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.