XML 64 R52.htm IDEA: XBRL DOCUMENT v3.8.0.1
COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Qualified Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period $ 0 $ 298 $ 0 $ 892
Interest cost on projected benefit obligation 403 470 1,209 1,410
Expected return on plan assets (785) (756) (2,355) (2,267)
Amortization of unrecognized transition obligation 0 0 0 0
Amortization of unrecognized prior service cost 0 1 0 5
Amortization of unrecognized net loss 58 383 174 1,150
Net periodic pension cost (benefit) (324) 396 (972) 1,190
Supplemental Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period 0 11 0 32
Interest cost on projected benefit obligation 12 13 36 39
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 6 3 19
Net periodic pension cost (benefit) 13 30 39 90
Postretirement Plan, Medical and Life        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period 0 11 0 35
Interest cost on projected benefit obligation 3 18 11 53
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost (55) (23) (165) (72)
Amortization of unrecognized net loss 29 7 87 19
Net periodic pension cost (benefit) $ (23) $ 13 $ (67) $ 35