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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reclassifications out of Accumulated Other Comprehensive Income before Tax [Abstract] |  |  |  |
Reclassifications |  | $ 586 | $ 3,348 | $ 3,343
Accumulated Defined Benefit Pension Items |  |  |  |
Reclassifications out of Accumulated Other Comprehensive Income before Tax [Abstract] |  |  |  |
Amortization of prior service cost | [1] | 219 | 279 | 296
Amortization of net loss | [1] | 570 | 4,229 | 4,205
Total reclassifications, before tax - pension and postretirement benefits | [1] | 789 | 4,508 | 4,501
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | [2] | (203) | (1,160) | (1,158)
Total reclassification, net of tax - pension and postretirement benefits |  | 586 | 3,348 | 3,343
Reclassifications |  | $ 586 | $ 3,348 | $ 3,343
[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

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