SHARE-BASED COMPENSATION Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Shares granted (in shares)	70,419	75,761	72,397
Restricted stock plan \| IDACORP
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested shares, beginning (in shares)	206,035
Shares granted (in shares)	98,868
Shares forfeited (in shares)	(4,640)
Shares vested (in shares)	(97,353)
Nonvested shares, ending (in shares)	202,910	206,035
Nonvested shares, period start - weighted average grant-date fair value (in dollars per share)	$ 81.31
Shares granted - weighted average grant-date fair value (in dollars per share)	92.58
Shares forfeited - weighted average grant-date fair value (in dollars per share)	94.57
Shares vested - weighted average grant-date fair value (in dollars per share)	71.95
Nonvested shares, period end - weighted average grant-date fair value (in dollars per share)	$ 90.99	$ 81.31
Restricted stock plan \| Idaho Power Company
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested shares, beginning (in shares)	204,859
Shares granted (in shares)	98,362
Shares forfeited (in shares)	(4,640)
Shares vested (in shares)	(96,761)
Nonvested shares, ending (in shares)	201,820	204,859
Nonvested shares, period start - weighted average grant-date fair value (in dollars per share)	$ 81.31
Shares granted - weighted average grant-date fair value (in dollars per share)	92.59
Shares forfeited - weighted average grant-date fair value (in dollars per share)	94.57
Shares vested - weighted average grant-date fair value (in dollars per share)	71.95
Nonvested shares, period end - weighted average grant-date fair value (in dollars per share)	$ 90.99	$ 81.31

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Topic 718
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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