COMMON STOCK: Common Stock Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Class of Stock [Line Items]
Shares granted (in shares)	75,030	70,419	75,761
Shares awarded to directors	10,296	9,594	12,950
Shares issued during the year	8,938	0
IDACORP
Class of Stock [Line Items]
Maximum leverage ratio requirement	0.65
Leverage ratio	0.44
Amount dividends were limited to based on covenant restrictions | $	$ 1,500,000
Idaho Power Company
Class of Stock [Line Items]
Capital contribution from parent | $	$ 0	$ 0	$ 0
Maximum leverage ratio requirement	0.65	0.65	0.65
Leverage ratio	0.46
Amount dividends were limited to based on covenant restrictions | $	$ 1,300,000
Percentage of capital threshold below which Idaho Power will not pay dividends to IDACORP	0.35
Equity Capital Ratio	0.54
Shares of preferred stock outstanding	0