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Information by Business Segments - Schedule of Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Operating revenues $ 1,438,936 $ 1,321,891 $ 1,345,622
Resource costs 497,123 398,509 439,817
Other operating expenses 372,052 359,958 383,770
Depreciation and amortization 232,176 224,223 205,994
Income (loss) from operations 228,232 232,700 210,389
Interest expense 106,152 105,061 104,354
Income taxes 12,031 7,051 31,374
Net income (loss) from continuing operations attributable to Avista Corp. shareholders 147,334 129,488 196,979
Capital expenditures 441,209 405,674 443,345
Total Assets 6,853,583 6,402,097 6,082,456
Avista Utilities [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 1,392,999 1,277,468 1,295,873
Alaska Electric Light & Power [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 45,366 42,809 37,265
Operating Segments [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 1,438,365 1,320,277 1,333,138
Resource costs 497,123 398,509 439,817
Other operating expenses 366,125 354,614 364,887
Depreciation and amortization 231,915 223,507 205,365
Income (loss) from operations 233,849 237,146 217,417
Interest expense 105,725 104,723 104,251
Income taxes 8,792 7,932 31,179
Net income (loss) from continuing operations attributable to Avista Corp. shareholders 132,782 132,905 191,435
Capital expenditures 439,939 404,306 442,510
Total Assets 6,723,666 6,304,311 5,984,661
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 1,392,999 1,277,468 1,295,873
Resource costs 493,289 396,543 442,471
Other operating expenses 352,241 341,709 352,170
Depreciation and amortization 221,552 213,701 195,697
Income (loss) from operations 217,663 220,058 200,994
Interest expense 99,629 98,451 97,866
Income taxes 6,029 4,921 28,363
Net income (loss) from continuing operations attributable to Avista Corp. shareholders 125,558 124,810 183,977
Capital expenditures 435,887 397,292 434,077
Total Assets 6,458,244 6,035,340 5,713,268
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 45,366 42,809 37,265
Resource costs 3,834 (1,966) 2,654
Other operating expenses 13,884 12,905 12,717
Depreciation and amortization 10,363 9,806 9,668
Income (loss) from operations 16,186 17,088 16,423
Interest expense 6,096 6,272 6,385
Income taxes 2,763 3,011 2,816
Net income (loss) from continuing operations attributable to Avista Corp. shareholders 7,224 8,095 7,458
Capital expenditures 4,052 7,014 8,433
Total Assets 265,422 268,971 271,393
Other [Member] | Non-Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 571 1,614 12,484
Resource costs 0 0 0
Other operating expenses 5,927 5,344 18,883
Depreciation and amortization 261 716 629
Income (loss) from operations (5,617) (4,446) (7,028)
Interest expense 522 524 1,032
Income taxes 3,239 881 (195)
Net income (loss) from continuing operations attributable to Avista Corp. shareholders 14,552 (3,417) (5,544)
Capital expenditures 1,270 1,368 835
Total Assets 132,158 109,658 113,390
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 0 0 0
Resource costs 0 0 0
Other operating expenses 0 0 0
Depreciation and amortization 0 0 0
Income (loss) from operations 0 0 0
Interest expense (95) (186) (929)
Income taxes 0 0 0
Net income (loss) from continuing operations attributable to Avista Corp. shareholders 0 0 0
Capital expenditures 0 0 0
Total Assets $ (2,241) $ (11,872) $ (15,595)