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Employee Benefit Plans: AOCI Amounts (After-Tax) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net (gain) loss $ 4,398 $ 5,511
Prior service cost (gain) (46) 0
Total amounts included in AOCI, after-tax not yet recognized as components of net periodic expense 4,352 5,511
Supplemental Employee Retirement Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net (gain) loss 7,159 9,323
Prior service cost (gain) 0 0
Total amounts included in AOCI, after-tax not yet recognized as components of net periodic expense 7,159 9,323
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Net (gain) loss (308) 100
Prior service cost (gain) (27) (144)
Total amounts included in AOCI, after-tax not yet recognized as components of net periodic expense $ (335) $ (44)