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Employee Benefit Plans: Components of Net Periodic Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost $ 614 $ 982
Interest cost 4,381 2,705
Expected return on assets (4,672) (4,631)
Net amortization of prior service cost (17) (17)
Recognized net actuarial loss (gain) 498 1,523
Net periodic expense (benefit) 804 562
Supplemental Employee Retirement Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 914 (392)
Interest cost 369 208
Expected return on assets 0 0
Net amortization of prior service cost 0 0
Recognized net actuarial loss (gain) 8 69
Net periodic expense (benefit) 1,291 (115)
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 381 492
Interest cost 594 321
Expected return on assets (56) (31)
Net amortization of prior service cost 10 (72)
Recognized net actuarial loss (gain) (3) 16
Net periodic expense (benefit) $ 926 $ 726