EARNINGS PER SHARE: Level 4 (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net Income Attributable to IDACORP, Inc.	$ 37,490	$ 42,686
Denominator:
Weighted-average common shares outstanding - basic	50,517	50,509
Effect of dilutive securities	10	9
Weighted-average common shares outstanding - diluted	50,527	50,518
Earnings attributable to IDACORP, Inc. - basic (in dollars per share)	$ 0.74	$ 0.85
Earnings attributable to IDACORP, Inc. - diluted (in dollars per share)	$ 0.74	$ 0.84