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ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Realized gains on securities available for sale     $ 0 $ (12)
Income tax expense $ 1,802 $ 1,710 3,349 4,250
Other components of net periodic pension and postretirement benefits (408) (333) (1,224) (999)
Net income (6,930) (3,654) (13,896) (9,589)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net income 13 21 40 54
Accumulated Net Investment Gain (Loss) Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Realized gains on securities available for sale 0 0 0 (12)
Income tax expense 0 0 0 4
Net income 0 0 0 (8)
Defined Benefit and Other Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (4) (12) (13) (37)
Net income 13 21 40 62
Prior Service Costs | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Other components of net periodic pension and postretirement benefits (55) (55) (165) (165)
Actuarial Losses | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Other components of net periodic pension and postretirement benefits $ 72 $ 88 $ 218 $ 264