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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
 12 Months Ended
Dec. 31, 2025
Statement of Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) The table below presents changes in components of AOCI, net of tax, during the years ended December 31 (in thousands of dollars). Items in parentheses indicate reductions to AOCI.
202520242023
Defined benefit pension items
Balance at beginning of period$(13,592)$(17,184)$(12,922)
Other comprehensive income before reclassifications, net of tax of $(374), $851, and $(1,680)
(2,034)2,454 (4,848)
Amounts reclassified out of AOCI to net income, net of tax of $229, $394, and $203
682 1,138 586 
Net current-period other comprehensive income(1,352)3,592 (4,262)
Balance at end of period$(14,944)$(13,592)$(17,184)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The table below presents the effects on net income of amounts reclassified out of components of AOCI and the income statement location of those amounts reclassified during the years ended December 31 (in thousands of dollars). Items in parentheses indicate increases to net income.
Amount Reclassified from AOCI
202520242023
Amortization of defined benefit pension items(1)
Prior service cost$221 $220 $219 
Net loss690 1,312 570 
Total before tax911 1,532 789 
Tax benefit(2)
(229)(394)(203)
Net of tax682 1,138 586 
Total reclassification for the period$682 $1,138 $586 
(1) Amortization of these items is included in "Other (income) expense, net" in the consolidated income statements of both IDACORP and Idaho Power.
(2) The tax benefit is included in "Income tax expense" in the consolidated income statements of both IDACORP and Idaho Power.