XML 69 R57.htm IDEA: XBRL DOCUMENT v3.10.0.1
COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Qualified Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period $ 0 $ 0 $ 0 $ 0
Interest cost on projected benefit obligation 385 403 1,154 1,209
Expected return on plan assets (826) (785) (2,478) (2,355)
Amortization of unrecognized transition obligation 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 43 58 130 174
Net periodic pension benefit (398) (324) (1,194) (972)
Supplemental Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period 0 0 0 0
Interest cost on projected benefit obligation 12 12 36 36
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 1 5 3
Net periodic pension benefit 13 13 41 39
Postretirement Plan, Medical and Life        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost, benefits earned during the period 0 0 0 0
Interest cost on projected benefit obligation 4 3 11 11
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost (55) (55) (165) (165)
Amortization of unrecognized net loss 28 29 83 87
Net periodic pension benefit $ (23) $ (23) $ (71) $ (67)