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Employee Benefit Plans: Components of Net Periodic Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 614 $ 982 $ 1,228 $ 1,964
Interest cost 4,381 2,704 8,761 5,409
Expected return on assets (4,672) (4,630) (9,344) (9,261)
Net amortization of prior service cost (17) (17) (34) (34)
Recognized net actuarial loss (gain) 498 1,523 996 3,046
Net periodic expense (benefit) 804 562 1,607 1,124
Supplemental Employee Retirement Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 770 (1,355) 1,684 (1,747)
Interest cost 369 209 738 417
Expected return on assets 0 0 0 0
Net amortization of prior service cost 0 0 0 0
Recognized net actuarial loss (gain) 8 69 16 138
Net periodic expense (benefit) 1,147 (1,077) 2,438 (1,192)
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 381 492 762 984
Interest cost 594 321 1,188 642
Expected return on assets (55) (31) (111) (62)
Net amortization of prior service cost 10 (73) 20 (145)
Recognized net actuarial loss (gain) (3) 16 (6) 32
Net periodic expense (benefit) $ 927 $ 725 $ 1,853 $ 1,451