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EARNINGS PER SHARE: Earnings Per Share Level 4 (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator:      
Net income attributable to IDACORP, Inc. $ 261,195 $ 258,982 $ 245,550
Denominator:      
Weighted Average Common Shares Outstanding - Basic (in shares) 50,717,000 50,658,000 50,599,000
Effect of Dilutive Securities (in shares) 89,000 [1] 41,000 46,000
Weighted Average Common Shares Outstanding - Diluted (in shares) 50,806,000 50,699,000 50,645,000
Earnings Attributable to IDACORP, Inc. - Basic (in dollars per share) $ 5.15 $ 5.11 $ 4.85
Earnings Attributable to IDACORP, Inc. - Diluted (in dollars per share) $ 5.14 $ 5.11 $ 4.85
Incremental CommonShares Attributable To Share Based Payment Arrangements, Forward Sale Agreement 34,131    
[1] The effect of dilutive securities amount includes 34,131 incremental shares related to FSAs as of December 31, 2023. See Note 6 - "Common Stock" for additional information concerning IDACORP's FSAs.