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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance $ (2,182) $ (1,901)
Change during period:    
Before-tax amount 45 77
Tax provision/benefit (16) (27)
Reclassification adjustment, net of taxes    
Amortization of net loss [1] 15 14
Net realized (gain) [2] (7)
Total activity for the period   64
Balance (2,145) (1,837)
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] 15 14
Net realized (gain) [2]
Total activity for the period 15 14
Balance (2,136) (1,885)
Unrealized Gain on Securities    
Accumulated Other Comprehensive Income Loss [Roll Forward]    
Balance (31) (2)
Change during period:    
Before-tax amount 45 77
Tax provision/benefit (16) (27)
Reclassification adjustment, net of taxes    
Amortization of net loss [1]
Net realized (gain) [2] (7)
Total activity for the period 22 50
Balance $ (9) $ 48
[1] Reported as part of selling, general and administrative expenses.
[2] Reported as part of interest income.