INCOME TAXES: Level 4 (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Expense [Line Items]
Income tax at statutory rates (federal and state)				$ 75,736	$ 79,030
Additional accumulated deferred investment tax credit amortization				(1,500)
First mortgage bond redemption costs				(5,583)	(7,210)
Share-based compensation				(1,754)	(2,628)
EffectiveIncomeTaxRateReconciliationAffordableHousingInvestmentDistribution				(1,561)
EffectiveIncomeTaxRateReconciliationAffordableHousingInvestmentAmortization				1,019	1,025
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount				(2,130)
Other	[1]			(35,605)	(30,941)
Income Tax Expense		$ 15,535	$ 23,523	$ 28,622	$ 39,276
Effective tax rate				14.80%	19.40%
Idaho Power Company
Income Tax Expense [Line Items]
Income tax at statutory rates (federal and state)				$ 74,864	$ 78,356
Additional accumulated deferred investment tax credit amortization				(1,500)
First mortgage bond redemption costs				(5,583)	(7,210)
Share-based compensation				(1,720)
Other	[1]			(34,964)	(30,274)
Income Tax Expense		$ 17,370	$ 23,895	$ 31,097	$ 40,872
Effective tax rate				16.20%	20.40%

[1] "Other" is primarily comprised of the net tax effect of Idaho Power's regulatory flow-through tax adjustments. These adjustments, which include the capitalized repairs deduction, are each listed in the rate reconciliation table in Note 2 to the consolidated financial statements included in IDACORP's and Idaho Power's Annual Report on Form 10-K for the year ended December 31, 2015.