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Information by Business Segments - Schedule of Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Operating revenues $ 474,631 $ 462,046  
Resource costs 192,928 186,868  
Other operating expenses 105,989 95,483  
Depreciation and amortization 65,219 62,609  
Income (loss) from operations 76,601 82,969  
Interest expense 35,655 28,184  
Income taxes (6,628) (10,836)  
Net income (loss) 54,845 71,565  
Capital expenditures 100,493 96,401  
Total Assets 7,393,926   $ 7,417,350
Avista Utilities [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 460,142 448,872  
Alaska Electric Light & Power [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 14,363 13,054  
Operating Segments [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 474,505 461,926  
Resource costs 192,928 186,868  
Other operating expenses 104,978 94,527  
Depreciation and amortization 65,188 62,577  
Income (loss) from operations 77,517 83,837  
Interest expense 35,526 28,059  
Income taxes (6,409) (11,100)  
Net income (loss) 55,669 70,571  
Capital expenditures 100,490 95,987  
Total Assets 7,221,310   7,240,486
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 460,142 448,872  
Resource costs 192,137 186,424  
Other operating expenses 101,389 90,984  
Depreciation and amortization 62,464 59,879  
Income (loss) from operations 70,559 77,779  
Interest expense 34,074 26,572  
Income taxes (7,948) (12,360)  
Net income (loss) 51,627 67,278  
Capital expenditures 97,764 95,464  
Total Assets 6,952,564   6,976,164
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 14,363 13,054  
Resource costs 791 444  
Other operating expenses 3,589 3,543  
Depreciation and amortization 2,724 2,698  
Income (loss) from operations 6,958 6,058  
Interest expense 1,452 1,487  
Income taxes 1,539 1,260  
Net income (loss) 4,042 3,293  
Capital expenditures 2,726 523  
Total Assets 268,746   264,322
Other [Member] | Non-Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 126 120  
Resource costs 0 0  
Other operating expenses 1,011 956  
Depreciation and amortization 31 32  
Income (loss) from operations (916) (868)  
Interest expense 347 128  
Income taxes 219 264  
Net income (loss) 824 994  
Capital expenditures 3 414  
Total Assets 188,075   187,027
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 0 0  
Resource costs 0 0  
Other operating expenses 0 0  
Depreciation and amortization 0 0  
Income (loss) from operations 0 0  
Interest expense (218) (3)  
Income taxes 0 0  
Net income (loss) 0 0  
Capital expenditures 0 $ 0  
Total Assets $ (15,459)   $ (10,163)