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Employee Benefit Plans: Components of Net Periodic Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 614 $ 982 $ 1,842 $ 2,946
Interest cost 4,381 2,705 13,142 8,114
Expected return on assets (4,672) (4,631) (14,016) (13,892)
Net amortization of prior service cost (17) (17) (51) (51)
Recognized net actuarial loss (gain) 498 1,522 1,494 4,568
Net periodic expense (benefit) 804 561 2,411 1,685
Supplemental Employee Retirement Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost (77) (271) 1,607 (2,018)
Interest cost 369 209 1,107 626
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 24 207
Net periodic expense (benefit) 300 7 2,738 (1,185)
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 381 492 1,143 1,476
Interest cost 594 321 1,783 963
Expected return on assets (55) (31) (167) (93)
Net amortization of prior service cost 10 (72) 30 (217)
Recognized net actuarial loss (gain) (3) 16 (9) 48
Net periodic expense (benefit) $ 927 $ 726 $ 2,780 $ 2,177