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BENEFIT PLANS: Schedule of Defined Benefit Plan Disclosures, Other Postretirment Benefit Plans (Details) - Postretirement Benefits - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 $ 54,604 $ 56,064  
Service cost 672 698 $ 658
Interest cost 2,973 2,824 2,980
Actuarial loss (gain) 1,976 (778)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid [1] (4,714) (4,204)  
Projected benefit obligation at December 31 55,511 54,604 56,064
Change in Fair Value of Plan Assets [Roll Forward]      
Fair value at January 1 31,128 [2] 31,804  
Actual return (loss) on plan assets 4,381 4,669  
Employer contributions [1] 736 (1,141)  
Benefits Paid [1] (4,714) (4,204)  
Fair value at December 31 31,531 [2] 31,128 [2] $ 31,804
Funded status at end of year (23,980) (23,476)  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant $ 2,300 $ 2,300  
Postretirement Benefit, Medical trend rate EY 7.00% 6.30%  
[1] Contributions and benefits paid are each net of $2.3 million and $2.3 million of plan participant contributions for 2025 and 2024, respectively.
[2] The postretirement benefits assets are primarily life insurance contracts.