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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Qualified Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period $ 0 $ 298 $ 0 $ 594
Interest cost on projected benefit obligation 403 470 806 940
Expected return on plan assets (785) (756) (1,570) (1,511)
Amortization of unrecognized transition obligation 0 0 0 0
Amortization of unrecognized prior service cost 0 2 0 4
Amortization of unrecognized net loss 58 383 116 767
Net periodic pension cost (benefit) (324) 397 (648) 794
Supplemental Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period 0 10 0 21
Interest cost on projected benefit obligation 12 13 24 26
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 1 7 2 13
Net periodic pension cost (benefit) 13 30 26 60
Postretirement Plan, Medical and Life        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period 0 12 0 24
Interest cost on projected benefit obligation 4 18 8 35
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost (55) (25) (110) (49)
Amortization of unrecognized net loss 29 6 58 12
Net periodic pension cost (benefit) $ (22) $ 11 $ (44) $ 22