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Short-Term Borrowings - Schedule of Balances Outstanding and Interest Rates of Borrowings (Parenthetical) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Apr. 30, 2024
Dec. 31, 2023
Short-Term Debt [Line Items]      
Long-term debt line of credit $ 82,800    
Avista Utilities [Member]      
Short-Term Debt [Line Items]      
Amount outstanding under committed line of credit [1] 295,000   $ 349,000
Line of credit, outstanding 212,200    
Long-term debt line of credit $ 82,800    
Bond purchasing agreement date 2024-03    
Avista Utilities [Member] | Subsequent Event [Member]      
Short-Term Debt [Line Items]      
Pollution control bonds   $ 83,700  
[1] As of March 31, 2024, there was $295.0 million outstanding under the committed line of credit; however, $212.2 million was classified as short-term borrowings and $82.8 million was classified as long-term debt on the Condensed Consolidated Balance
Sheet due to the Company's intention to refinance such amount on a long-term basis. The amount classified as long-term debt was refinanced through the remarketing of $83.7 million of City of Forsyth, Montana Pollution Control Revenue Refunding Bonds in April 2024 pursuant to a remarketing and bond purchase agreement entered in March 2024. See Note 9 for further discussion of the remarketed bonds and the refinancing of short-term debt on a long-term basis. The entire outstanding amount of the committed line of credit as of December 31, 2023 was classified as short-term borrowings on the Condensed Consolidated Balance Sheet.