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Information by Business Segments - Schedule of Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Operating revenues $ 379,626 $ 359,446 $ 1,234,194 $ 1,200,058  
Resource costs 148,282 147,784 482,454 492,049  
Other operating expenses 103,072 102,742 312,881 305,617  
Depreciation and amortization 66,905 63,516 198,272 188,961  
Income (loss) from operations 38,087 19,402 158,496 126,654  
Interest expense 35,484 29,835 106,765 86,714  
Income tax expense (benefit) (3,786) 157 (16,224) (11,678)  
Net income (loss) 14,716 (5,798) 87,045 77,220  
Capital expenditures 132,531 120,663 359,277 332,065  
Total Assets 7,470,030   7,470,030   $ 7,417,350
Operating Segments [Member] | Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 379,524 359,292 1,233,827 1,199,639  
Resource costs 148,282 147,784 482,454 492,049  
Other operating expenses 102,469 101,701 310,518 300,710  
Depreciation and amortization 66,860 63,484 198,196 188,867  
Income (loss) from operations 38,633 20,321 160,568 131,236  
Interest expense 35,352 29,703 106,374 86,327  
Income tax expense (benefit) (3,809) 218 (15,301) (13,658)  
Net income (loss) 13,786 (5,759) 89,624 69,533  
Capital expenditures 132,531 120,663 359,277 331,309  
Total Assets 7,297,676   7,297,676   7,240,486
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 369,673 349,655 1,198,419 1,167,042  
Resource costs 146,793 146,384 478,947 489,029  
Other operating expenses 98,609 98,062 299,274 289,828  
Depreciation and amortization 64,125 60,780 190,008 180,765  
Income (loss) from operations 37,081 18,660 148,897 121,476  
Interest expense 33,896 28,214 102,014 81,864  
Income tax expense (benefit) (3,845) 197 (17,349) (14,728)  
Net income (loss) 13,498 (5,987) 83,935 65,241  
Capital expenditures 127,666 116,809 347,264 324,123  
Total Assets 7,026,484   7,026,484   6,976,164
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 9,851 9,637 35,408 32,597  
Resource costs 1,489 1,400 3,507 3,020  
Other operating expenses 3,860 3,639 11,244 10,882  
Depreciation and amortization 2,735 2,704 8,188 8,102  
Income (loss) from operations 1,552 1,661 11,671 9,760  
Interest expense 1,456 1,489 4,360 4,463  
Income tax expense (benefit) 36 21 2,048 1,070  
Net income (loss) 288 228 5,689 4,292  
Capital expenditures 4,865 3,854 12,013 7,186  
Total Assets 271,192   271,192   264,322
Other [Member] | Non-Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 102 154 367 419  
Resource costs 0 0 0 0  
Other operating expenses 603 1,041 2,363 4,907  
Depreciation and amortization 45 32 76 94  
Income (loss) from operations (546) (919) (2,072) (4,582)  
Interest expense 538 243 1,333 508  
Income tax expense (benefit) 23 (61) (923) 1,980  
Net income (loss) 930 (39) (2,579) 7,687  
Capital expenditures 0 0 0 756  
Total Assets 190,853   190,853   187,027
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 0 0 0 0  
Resource costs 0 0 0 0  
Other operating expenses 0 0 0 0  
Depreciation and amortization 0 0 0 0  
Income (loss) from operations 0 0 0 0  
Interest expense (406) (111) (942) (121)  
Income tax expense (benefit) 0 0 0 0  
Net income (loss) 0 0 0 0  
Capital expenditures 0 $ 0 0 $ 0  
Total Assets $ (18,499)   $ (18,499)   $ (10,163)