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Credit Agreements - Additional Information (Details) - Avista Utilities [Member] - USD ($) $ in Thousands | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Short-term Debt [Line Items] |  |  |
Credit agreement amount borrowed |  | $ 150,000 |
Letters of credit outstanding | $ 4,700 |  | $ 35,563
Line of credit facility, covenant terms, maximum debt to equity ratio | 65.00% |  |

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