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BENEFIT PLANS: Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reclassification adjustments for:      
Unfunded pension liability adjustment, net of tax $ 1,352 $ (3,592) $ 4,262
Pension Plan      
Defined Benefit Plan Disclosure      
Actuarial (loss) gain during the year 30,374 63,119 (25,071)
Plan amendment service cost 0 0 0
Reclassification adjustments for:      
Amortization of net loss 0 1,700 0
Amortization of prior service cost 6 6 6
Adjustment for deferred tax effects (7,604) (16,686) 6,452
Adjustment due to the effects of regulation 22,776 48,139 (18,613)
Unfunded pension liability adjustment, net of tax 0 0 0
Senior Management Security Plan      
Defined Benefit Plan Disclosure      
Actuarial (loss) gain during the year (2,401) 3,320 (6,517)
Plan amendment service cost (7) (15) (11)
Reclassification adjustments for:      
Amortization of net loss 690 1,312 570
Amortization of prior service cost 221 220 219
Adjustment for deferred tax effects 145 (1,245) 1,477
Adjustment due to the effects of regulation 0 0 0
Unfunded pension liability adjustment, net of tax (1,352) 3,592 (4,262)
Postretirement Benefits      
Defined Benefit Plan Disclosure      
Actuarial (loss) gain during the year 619 3,616 7,572
Reclassification adjustments for:      
Amortization of prior service cost 1,375 1,548 1,665
Adjustment for deferred tax effects (57) (945) (2,059)
Adjustment due to the effects of regulation 172 2,725 5,941
Unfunded pension liability adjustment, net of tax $ 0 $ 0 $ 0