Shedule of short term debt [Abstract] Shedule of short term debt [Abstract] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Legal Entity [Axis] Entity [Domain] IDACORP Parent Company [Member] Idaho Power Company Idaho Power Company [Member] Idaho Power Company, a wholly owned subsidiary of IDACORP, Inc. Short-term borrowings: Short-term Debt [Line Items] Extension Period of State Regulatory Authorization to Issue Debt Extension Period of State Regulatory Authorization to Issue Debt The duration of time that the entity is allowed as an extension, as authorized by the respective state regulatory agency, to issue debt. Commercial paper outstanding Short-term Debt Weighted-average annual interest rate Short-term Debt, Weighted Average Interest Rate Credit facility: Line of Credit Facility [Abstract] Amount outstanding on credit facility Long-term Line of Credit Regulatory authority to incur short-term indebtedness Regulatory Authority for Maximum Short term Indebtedness Maximum indebtedness for which regulatory approval has been granted without consideration of any actual credit facilities in place. Document And Entity Information [Abstract] Document and Entity Information Document Information [Table] Document Information [Table] Rate Cases [Axis] Rate Cases [Axis] The list of rate cases itemized in a delineation of regulatory matters. Rate Cases [Domain] Rate Cases [Domain] Rate Cases [Domain] Idaho Settlement Stipulation - Investment Tax Credits and Sharing Mechanism Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism [Member] Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Document Information Document Information [Line Items] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Tax Identification Number Entity Tax Identification Number Segment Information [Abstract] Segment Information [Abstract] Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Income Tax Disclosure [Abstract] Income Tax Expense [Table] Income Tax Expense [Table] An analysis of income tax expense for the period. Income Tax Expense [Line Items] Income Tax Expense [Line Items] Income tax at statutory rates (federal and state) Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Additional accumulated deferred investment tax credit amortization Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensation EffectiveIncomeTaxRateReconciliationShareBasedCompensation EffectiveIncomeTaxRateReconciliationShareBasedCompensation Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Income Tax Expense Income Tax Expense (Benefit) Effective tax rate Effective Income Tax Rate Reconciliation, Percent Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Statement of Comprehensive Income [Abstract] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Entity [Domain] Statement [Line Items] Statement [Line Items] Allowance for Doubtful Accounts Receivable, Current Allowance for Doubtful Accounts Receivable, Current Allowance for Doubtful Other Receivables, Current Allowance for Doubtful Other Receivables, Current Allowance for Doubtful Accounts Receivable, Noncurrent Allowance for Doubtful Accounts Receivable, Noncurrent Common Stock, No Par Value Common Stock, No Par Value Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Treasury Stock, Shares Treasury Stock, Shares Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plan United States Pension Plan of US Entity [Member] Senior Management Security Plan Supplemental Employee Retirement Plan [Member] Postretirement Benefits United States Postretirement Benefit Plan of US Entity [Member] Defined Benefit Plan Disclosure Defined Benefit Plan Disclosure [Line Items] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of net loss Defined Benefit Plan, Amortization of Gains (Losses) Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost Adjustments due to the effects of regulation Defined Benefit Plan Regulatory Adjustments Deferred The difference between the period's pension costs calculated for GAAP and ratemaking purposes, which is deferred as a regulatory adjustment. Net periodic benefit cost recognized for financial reporting Defined Benefit Plan Net Periodic Benefit Cost After Regulatory Adjustments The periodic benefit expense recognized in the consolidated statements of income. Contributions made to the defined benefit pension plan Defined Benefit Plan, Contributions by Employer Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Defined Benefit Pension Items Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Reclassification out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification out of Accumulated Other Comprehensive Income Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract] Amortization of prior service cost Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax Amortization of net loss Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax Total reclassification, before tax - pension and postretirement benefits Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Total reclassification, net of tax - pension and postretirement benfits Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax Reclassifications Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] AOCI - Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax AOCI - Ending Balance Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges [Policy Text Block] Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges [Policy Text Block] Nature of Operations Nature of Operations [Text Block] Regulation of Utility Operations Public Utilities, Policy [Policy Text Block] Financial Statements Comparability of Prior Year Financial Data, Policy [Policy Text Block] Management Estimates Use of Estimates, Policy [Policy Text Block] Income Tax Income Tax, Policy [Policy Text Block] Segment Reporting Segment Reporting Disclosure [Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Derivatives, Methods of Accounting, Hedging Derivatives Derivatives, Methods of Accounting, Hedging Derivatives [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Segment Reporting, Policy [Policy Text Block] Segment Reporting, Policy [Policy Text Block] Public Utilities, Rate Matters [Abstract] Regulatory Matters Public Utilities Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets, Level 1 to Level 2 Transfers, Amount Fair Value, Assets, Level 1 to Level 2 Transfers, Amount Derivative Assets Derivative Asset Money market funds Cash and Cash Equivalents, Fair Value Disclosure Trading Securities Trading Securities Available-for-sale Securities: Equity securities Available-for-sale Securities Derivative Liabilities Derivative Liability Long-term Debt, Unclassified [Abstract] Long-term Debt [Text Block] Long-term Debt [Text Block] Regulatory Matters Disclosures [Abstract] Regulatory Matters [Abstract] Regulatory Matters Disclosures Schedule of Regulatory Assets [Table] Idaho and Oregon General Rate Cases and Base Rate Adjustments Idaho and Oregon General Rate Cases and Base Rate Adjustments [Member] Idaho and Oregon General Rate Cases and Base Rate Adjustments Cost Recovery for Langley Gulch Power Plant Cost Recovery for Langley Gulch Power Plant [Member] Cost Recovery for Langley Gulch Power Plant [Member] Annual Power Cost Adjustment Mechanism Filing [Member] Annual Power Cost Adjustment Mechanism Filing [Member] Annual Power Cost Adjustment Mechanism Filing[Member] Idaho Fixed Cost Adjustment Mechanism Annual Filing Idaho Fixed Cost Adjustment [Member] Annual Idaho Fixed Cost Adjustment Filing [Member] Regulatory jurisdiction [Axis] Regulatory jurisdiction [Axis] Regulatory jurisdiction [Axis] Regulatory jurisdiction [Domain] Regulatory jurisdiction [Domain] Regulatory jurisdiction [Domain] IDAHO IDAHO OREGON OREGON Rate Case Rate Case [Line Items] Rate Case [Line Items] Authorized Rate of Return in Rate Case Authorized Rate of Return in Rate Case The authorized rate of return, whether requested or approved, in the rate case. Total Retail Rate Base Total retail rate base contemplated in the rate case. Approved Rate Increase (Decrease), Amount Public Utilities, Approved Rate Increase (Decrease), Amount Public Utilities, Approved Return on Equity, Percentage Public Utilities, Approved Return on Equity, Percentage Increase (Decrease) in Rate Base Increase (Decrease) In Rate Base Total amount of increase or (decrease) in rate base, whether approved or requested, as a result of the related rate case or application. Authorized Return on Equity in Rate Case, Minimum The minimum authorized return on equity, whether requested or approved, in the rate case. Authorized Return on Equity in Rate Case, Mid-point Authorized Return on Equity in Rate Case, Mid-point Authorized Return on Equity in Rate Case, Mid-point Authorized Return on Equity in Rate Case, Maximum The maximum authorized return on equity, whether requested or approved, in the rate case. Public Utilities, Requested Rate Increase (Decrease), Amount Public Utilities, Requested Rate Increase (Decrease), Amount Investment Tax Credits Maximum In One Year In Rate Case Investment Tax Credits Maximum In One Year In Rate Case The maximum amount, whether proposed or approved, of additional investment tax credits that are allowed in the rate case in a given year that are computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to investment tax credits generated or utilized under enacted tax laws during the period. Investment Tax Credits, Maximum, in Rate Case Investment Tax Credits, Maximum, in Rate Case The maximum amount, whether proposed or approved, of additional investment tax credits that are allowed in the rate case that are computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to investment tax credits generated or utilized under enacted tax laws during the period. Percentage to be Shared with Customers Percentage to be Shared with Customers Percentage of earnings to be Shared with Customers that is above the applicable authorized rate of return in the rate case. Percentage to be Shared with Entity Percentage to be Shared with Entity Percentage of earnings to be Shared with the Entity that is above the applicable authorized rate of return in the rate case. Percent To Be Shared With Customers, Power Cost Adjustment Percent To Be Shared With Customers, Power Cost Adjustment Percentage of earnings to be Shared with Customers, though a rate reduction effective at the time of the subsequent year's power cost adjustment, that is above the maximum authorized rate of return in the rate case. Percent To Be Shared With Customers, Pension Balancing Percent To Be Shared With Customers, Pension Balancing Percentage of earnings to be Shared with Customers, though additional pension expense as a reduction to the pension regulatory asset balancing account, that is above the maximum authorized rate of return in the rate case. Regulatory Liabilities Regulatory Liabilities Annual fixed cost adjustment mechanism deferral Annual fixed cost adjustment mechanism deferral Annual fixed cost adjustment mechanism deferral amount, whether approved or requested. Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement, Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] All Other Other Segments [Member] Eliminations Intersegment Eliminations [Member] Segment Reporting Information Segment Reporting Information [Line Items] IERCo's ownership percentage in Bridger Coal Company Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Revenues Revenue, Net Income (loss) attributable to IDACORP, Inc. Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income Attributable to IDACORP, Inc. Net Income (Loss) Attributable to Parent Total assets Assets Income Statement [Abstract] Operating Revenues: Revenues [Abstract] General business Electric Domestic Regulated Revenue Off-system sales Electrical Generation Revenue Other revenues Regulated Operating Revenue, Other Total electric utility revenues Electric Revenue Other Other Revenue, Net Total operating revenues Operating Expenses: Operating Costs and Expenses [Abstract] Purchased power Utilities Operating Expense, Purchased Power Fuel expense Utilities Operating Expense, Fuel Used Power cost adjustment Power cost adjustment expense (deferral) An adjustment to net power supply costs (Purchased Power and Fuel less Off-system sales) listed to defer/accrue them for amounts that will be collected from/returned to customers in the future, and to recognize previously deferred/accrued net power supply costs to match with amounts now collected from/returned to customers. Other operations and maintenance Utilities Operating Expense, Maintenance and Operations Energy efficiency programs Energy efficiency programs This balance represents costs expended on energy efficiency programs. Depreciation Utilities Operating Expense, Depreciation and Amortization Taxes other than income taxes Taxes, Miscellaneous Total electric utility expenses Utilities Operating Expense Other Other General Expense Total operating expenses Operating Expenses Operating Income Operating Income (Loss) Other Income (Expense): Nonoperating Income (Expense) [Abstract] Allowance for equity funds used during construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Earnings of unconsolidated equity-method investments Income (Loss) from Equity Method Investments Other expense, net Other Nonoperating Income (Expense) Total other income Nonoperating Income (Expense) Interest Expense: Interest Expense [Abstract] Interest on long-term debt Interest Expense, Debt Other interest Interest Expense, Other Allowance for borrowed funds used during construction Interest Costs Capitalized Adjustment Total interest expense, net Interest Expense Income Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income Tax Expense Net Income Adjustment for loss (income) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net Income Attributable to IDACORP, Inc. Weighted Average Common Shares Outstanding - Basic (000’s) Weighted Average Number of Shares Outstanding, Basic Weighted Average Common Shares Outstanding - Diluted (000’s) Weighted Average Number of Shares Outstanding, Diluted Earnings Per Share of Common Stock: Earnings Attributable to IDACORP, Inc. - Basic (in dollars per share) Earnings Per Share, Basic Earnings Attributable to IDACORP, Inc. - Diluted (in dollars per share) Earnings Per Share, Diluted Dividends Declared Per Share of Common Stock Common Stock, Dividends, Per Share, Declared Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 6.15 Series due 2019 First mortgage bonds 6.15 Series due 2019 [Member] Collateralized debt obligations (with maturities initially due 2019), excluding the current portion, if any. Such obligations include mortgage loans at 6.15% 4.05% Series due 2046 First mortgage bonds 4.05 Series due 2046 [Member] Collateralized debt obligations (with maturities initially due 2046), excluding the current portion, if any. Such obligations include mortgage loans at 4.05%. Debt Instrument Debt Instrument [Line Items] First Mortgage Bonds Secured Long-term Debt, Noncurrent Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Gains (Losses) on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt Debt Instrument, Unused Borrowing Capacity, Amount Debt Instrument, Unused Borrowing Capacity, Amount Principal amount of debt securities and first mortgage bonds authorized Principal amount of debt securities and first mortgage bonds authorized Principal amount of debt securities and first mortgage bonds authorized by the IPUC, OPUC, and WPSC. Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common Stock Common Stock Text Block Common Stock [Text Block] Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest, Parenthetical Disclosures [Abstract] Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax Earnings Per Share, Basic and Diluted [Abstract] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] Schedule of Short-term Debt Schedule of Short-term Debt [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Bridger Coal Company Bridger Coal Company [Member] Bridger Coal Company [Member] Guarantor Obligations Guarantor Obligations [Line Items] IERCo ownership interest in BCC IERCo guarantee of BCC reclamation obligation Guarantor Obligations, Maximum Exposure, Undiscounted Guarantor Obligations Total Reclamation Trust Fund Guarantor Obligations Total Reclamation Trust Fund Total reclamation trust fund balance related to the guarantee obligation that exists at the balance sheet date. Distribution from Reclamation Trust Fund Distribution from Reclamation Trust Fund Distribution from Reclamation Trust Fund related to the guarantee obligation that exists at the balance sheet date. Long-term Purchase Commitment Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract] Reduction of Long-term Purchase Commitment, Amount Reduction of Long-term Purchase Commitment, Amount The estimated reduction amount the entity agreed to spend under long-term purchase commitment(s). Life of Contract Life of Contract Life of Contract Nameplate Capacity Nameplate Capacity Nameplate Capacity of generating plant. Estimated purchase obligation Estimated purchase obligation The estimated purchase obligation amount for contracts entered into during the period. Purchase Obligation Purchase Obligation Loss Contingency [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Loss Contingency, Estimate of Possible Loss Loss Contingency, Estimate of Possible Loss Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Changes in Accumulated Other Comprehensive Income [Text Block] Changes in Accumulated Other Comprehensive Income [Text Block] The entire disclosure for an entity's changes in accumulated other comprehensive income for the periods presented. Net Income Other Comprehensive Income: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Unfunded pension liability adjustment (net of tax) Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Total Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive loss (income) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income Attributable to IDACORP, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Summary of Derivative Instruments [Abstract] Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Derivatives, Reporting of Derivative Activity [Policy Text Block] Derivatives, Reporting of Derivative Activity [Policy Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Financial Swaps Energy Related Derivative [Member] Forward contracts Commodity Contract [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Current Assets [Member] Other Current Assets [Member] Other Current Liabilities [Member] Other Current Liabilities [Member] Other Liabilities [Member] Other Liabilities [Member] Other Assets [Member] Other Assets [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivative Asset, Fair Value, Gross Asset Derivative Asset, Fair Value, Gross Asset Derivative Asset, Fair Value, Gross Liability Derivative Asset, Fair Value, Gross Liability Derivative Asset, Fair Value, Amount Offset Against Collateral Derivative Asset, Fair Value, Amount Offset Against Collateral Derivative Liability, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Asset Derivative Liability, Fair Value, Gross Asset Derivative Liability, Fair Value, Amount Offset Against Collateral Derivative Liability, Fair Value, Amount Offset Against Collateral Derivative Asset, Collateral, Obligation to Return Cash, Offset Derivative Liability, Collateral, Right to Reclaim Cash, Offset Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Net income attributable to IDACORP, Inc. Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted Average Common Shares Outstanding - Basic Effect of dilutive securities Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted Average Common Shares Outstanding - Diluted Asset Retirement Obligation [Abstract] Schedule of Change in Asset Retirement Obligation [Table] Schedule of Change in Asset Retirement Obligation [Table] Schedule of Change in Asset Retirement Obligation [Table] Asset Retirement Obligations [Axis] Asset Retirement Obligations [Axis] Asset Retirement Obligations [Axis] Asset Retirement Obligations [Domain] Asset Retirement Obligations [Domain] Asset Retirement Obligations [Domain] Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] Asset Retirement Obligation, Revision of Estimate Asset Retirement Obligation, Revision of Estimate Statement of Stockholders' Equity [Abstract] Common Stock Stock Issued or Granted During Period, Share-based Compensation [Abstract] Balance at beginning of period Common Stock, Value, Issued Common stock issued Stock Issued During Period, Value, New Issues Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Other common stock changes Stockholders' Equity, Other Balance at end of period Retained Earnings Retained Earnings (Accumulated Deficit) [Abstract] Balance at beginning of period Retained Earnings (Accumulated Deficit) Common stock dividends Dividends, Common Stock, Cash Balance at end of period Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Treasury Stock Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] Balance at beginning of period Treasury Stock, Value Issued Stock Issued During Period, Value, Treasury Stock Reissued Acquired Treasury Stock, Value, Acquired, Cost Method Balance at end of period Total IDACORP, Inc. shareholders’ equity at end of period Stockholders' Equity Attributable to Parent Noncontrolling Interests Noncontrolling Interest Items [Abstract] Balance at beginning of period Stockholders' Equity Attributable to Noncontrolling Interest Net (loss) income attributable to noncontrolling interests Balance at end of period Total equity at end of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Off-system sales Sales [Member] Purchased power Cost of Sales [Member] Fuel expense Operating Expense [Member] Other operations and maintenance Other Operating Income (Expense) [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivative, Loss on Derivative Derivative, Loss on Derivative Derivative, Gain on Derivative Derivative, Gain on Derivative Debt Disclosure [Abstract] Notes Payable Short-term Debt [Text Block] Current Assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Receivables: Receivables, Net, Current [Abstract] Customer Accounts Receivable, Net, Current Other Other Receivables Taxes receivable Income Taxes Receivable, Current Accrued unbilled revenues Unbilled Receivables, Current Materials and supplies (at average cost) Other Inventory, Supplies, Gross Fuel stock (at average cost) Energy Related Inventory, Other Fossil Fuel Prepayments Prepaid Expense, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Current regulatory assets Regulatory Assets, Current Other Other Assets, Current Total current assets Assets, Current Investments Long-term Investments Property, Plant and Equipment: Property, Plant and Equipment, Net [Abstract] Utility plant in service Public Utilities, Property, Plant and Equipment, Plant in Service Accumulated provision for depreciation Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Utility plant in service - net Public Utilities, Property, Plant and Equipment, Net Construction work in progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Utility plant held for future use Plant Held for Future Use Amount Other property, net of accumulated depreciation Property, Plant and Equipment, Other, Net Property, plant and equipment - net Property, Plant and Equipment, Net Other Assets: Assets, Noncurrent [Abstract] American Falls and Milner water rights Finite-Lived Intangible Assets, Gross Company-owned life insurance Life Insurance, Corporate or Bank Owned, Amount Regulatory assets Regulatory Assets, Noncurrent Long-term receivables Accounts Receivable, Net, Noncurrent Other Other Assets, Noncurrent Total other assets Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment Total Current Liabilities: Liabilities, Current [Abstract] Current maturities of long-term debt Long-term Debt, Current Maturities Notes payable Notes Payable, Current Accounts payable Accounts Payable, Current Accounts payable to affiliates Due to Related Parties, Current Taxes accrued Taxes Payable, Current Interest accrued Interest Payable, Current Accrued compensation Employee-related Liabilities, Current Current regulatory liabilities Regulatory Liability, Current Customer Advances, Current Customer Advances, Current Other Other Liabilities, Current Total current liabilities Liabilities, Current Other Liabilities: Liabilities, Noncurrent [Abstract] Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Regulatory liabilities Regulatory Liability, Noncurrent Pension and other postretirement benefits Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent Other Other Liabilities, Noncurrent Total other liabilities Liabilities, Noncurrent Long-Term Debt Long-term Debt, Excluding Current Maturities Commitments and Contingencies Commitments and Contingencies Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common stock Premium on capital stock Additional Paid in Capital, Common Stock Capital stock expense Capital stock issuance costs Accumulated direct costs (e.g. legal and accounting fees) associated with issuing stock that was deducted from additional paid in capital. Retained earnings Accumulated other comprehensive loss Treasury stock Total IDACORP, Inc. shareholders’ equity Noncontrolling interests Total equity Total capitalization Capitalization, Long-term Debt and Equity Total Liabilities and Equity General Discussion of Derivative Instruments and Hedging Activities [Abstract] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Common Stock [Abstract] Common Stock [Abstract] Schedule of common stock issued during period [Table] Schedule of common stock issued during period [Table] Schedule of common stock issued during period [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Continuous equity program Stock Compensation Plan [Member] Shareholders' equity Shareholders' equity [Line Items] Shareholders' equity [Line Items] Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Remaining shares available under sales agency agreement Remaining shares available under current sales agency agreement Number of shares remaining available to be sold under the current sales agency agreement. Maximum leverage ratio requirement Maximum leverage ratio requirement Maximum aggregate indebtedness divided by net capital, as allowed by credit facility covenant. Ratio of Indebtedness to Net Capital Ratio of Indebtedness to Net Capital Dividend Distribution Restriction Amount Dividend Distribution Restriction Amount The maximum amount of dividends that can by paid out by the entity, as allowed by credit facility covenant. Dividend Distribution Restriction Threshold Dividend Distribution Restriction Threshold The threshold below which the entity will not pay any dividends to the parent company that would reduce the entity's common equity capital, without obtaining regulatory approval. Ratio of total Capital to total capital and long-term debt Ratio of total Capital to total capital and long-term debt Ratio of total Capital to total capital and long-term debt Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding General Discussion of Pension and Other Postretirement Benefits [Abstract] Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Segment Reporting, Measurement Disclosures [Abstract] Segment Information Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Reported Value Measurement [Member] Reported Value Measurement [Member] Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Notes Receivable Notes Receivable, Fair Value Disclosure Long-term Debt Loans Payable, Fair Value Disclosure Income Taxes Income Tax Disclosure [Text Block] Contingencies Contingencies Disclosure [Text Block] Stock Transactions, Parenthetical Disclosures [Abstract] Disclosure Text Block Supplement [Abstract] Commitments Commitments Disclosure [Text Block] Derivative Instrument Detail [Abstract] Derivative [Table] Derivative [Table] Derivative, by Nature [Axis] Energy [Axis] Energy [Domain] Energy [Domain] Electricity (MWh) Electricity [Member] Represents purchased or sold energy in the form of power. Natural Gas (MMBTU) Fuel [Member] Diesel Fuel (Gallons) Diesel Fuel [Member] Represents diesel fuel used for the production of energy in the form of heat or power. Position [Axis] Position [Axis] Position [Domain] Position [Domain] Long [Member] Long [Member] Short [Member] Short [Member] Derivative Derivative [Line Items] Derivative, Nonmonetary Notional Amount Derivative, Nonmonetary Notional Amount Derivatives in a net liability position Derivative, Net Liability Position, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Additional Collateral, Aggregate Fair Value Additional Collateral, Aggregate Fair Value Statement of Cash Flows [Abstract] Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Deferred income taxes and investment tax credits Deferred Income Taxes and Tax Credits Changes in regulatory assets and liabilities Increase (Decrease) in Regulatory Assets and Liabilities Pension and postretirement benefit plan expense Pension and Other Postretirement Benefit Expense Contributions to pension and postretirement benefit plans Pension and Other Postretirement Benefit Contributions Losses (earnings) of unconsolidated equity-method investments Distributions from unconsolidated equity-method investments Proceeds from Equity Method Investment, Dividends or Distributions Allowance for equity funds used during construction Public Utilities, Allowance for Funds Used During Construction, Additions Other non-cash adjustments to net income, net Other Noncash Income (Expense) Change in: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Accounts payable and other accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Taxes accrued/receivable Increase (Decrease) in Income Taxes Payable Other current assets Increase (Decrease) in Other Current Assets Other current liabilities Increase (Decrease) in Other Current Liabilities Other assets Increase (Decrease) in Other Operating Assets Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from the sale of emission allowances and RECs Proceeds from Sale of Intangible Assets Distributions from affordable housing investments Payments for (Proceeds from) Real Estate Partnership Investment, Net Other Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Issuance of long-term debt Proceeds from Issuance of Long-term Debt Retirement of long-term debt Repayments of Long-term Debt Dividends on common stock Payments of Ordinary Dividends, Common Stock Net change in short-term borrowings Proceeds from (Repayments of) Short-term Debt Issuance of common stock Proceeds from Issuance of Common Stock Acquisition of treasury stock Payments for Repurchase of Common Stock Make-whole premium on retirement of long-term debt Payments of Debt Extinguishment Costs Other Proceeds from (Payments for) Other Financing Activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Supplemental Disclosure of Cash Flow Information: Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Supplemental Disclosure of Cash Flow Information: Supplemental Cash Flow Information [Abstract] Income taxes Income Taxes Paid, Net Interest (net of amount capitalized) Interest Paid, Net Non-cash investing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Additions to property, plant and equipment in accounts payable Capital Expenditures Incurred but Not yet Paid Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block]