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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
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