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Regulatory Matters - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Regulated Asset Liability [Line Items] |  |  |
Threshold limit of deadband and sharing bands for future surcharge or rebate to customer |  | $ 4,000 |
Threshold to return washington energy recovery mechanism dollars to customers |  | $ 30,000 |
Proposed cumulative rebate refund period |  | 2 years |
Deferred natural gas costs, asset |  | $ 51,400 | $ 52,100
Forecast [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Change in energy recovery mechanism over customer | 95.00% |  |
Change in energy recovery mechanism over company sharing basis | 5.00% |  |
WASHINGTON |  |  |
Regulated Asset Liability [Line Items] |  |  |
Decoupling maximum rate increase request |  | 3.00% |
WASHINGTON | Power Deferrals Regulatory Asset [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | $ 37,600 | 30,500
IDAHO | Power Deferrals Regulatory Asset [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 7,600 | 16,300
Revenue Subject to Refund [Member] | IDAHO |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities |  | $ 572 | $ 686

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