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Regulatory Matters - Schedule of Decoupling and Earnings Sharing Mechanisms (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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WASHINGTON | Decoupling Surcharge (Rebate) [Member] |  |
Scheduleof Decouplingand Earnings Sharing [Line Items] |  |
Regulatory assets | $ 13,522,000 | $ 21,340,000
WASHINGTON | Revenue Subject to Refund [Member] |  |
Scheduleof Decouplingand Earnings Sharing [Line Items] |  |
Regulatory Liabilities | 0 | 0
IDAHO | Decoupling Surcharge (Rebate) [Member] |  |
Scheduleof Decouplingand Earnings Sharing [Line Items] |  |
Regulatory assets |  | 1,202,000
IDAHO | Revenue Subject to Refund [Member] |  |
Scheduleof Decouplingand Earnings Sharing [Line Items] |  |
Regulatory Liabilities | (686,000) | (686,000)
IDAHO | Decoupling Surcharge (Rebate) [Member] |  |
Scheduleof Decouplingand Earnings Sharing [Line Items] |  |
Regulatory Liabilities | (1,450,000) |
OREGON | Revenue Subject to Refund [Member] |  |
Scheduleof Decouplingand Earnings Sharing [Line Items] |  |
Regulatory Liabilities | 0 | 0
OREGON | Decoupling Surcharge (Rebate) [Member] |  |
Scheduleof Decouplingand Earnings Sharing [Line Items] |  |
Regulatory Liabilities | $ (3,152,000) | $ (1,262,000)

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