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Employee Benefit Plans: AOCI Amounts (After-Tax) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net (gain) loss $ 5,179 $ 4,398
Prior service cost (gain) (39) (46)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax, Total 5,140 4,352
Supplemental Employee Retirement Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net (gain) loss 1,565 7,159
Prior service cost (gain) 0 0
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax, Total 1,565 7,159
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net (gain) loss (667) (308)
Prior service cost (gain) 74 (27)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax, Total $ (593) $ (335)