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Information by Business Segments - Schedule of Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Operating revenues $ 1,710,207 $ 1,438,936 $ 1,321,891
Resource costs 735,862 497,123 398,509
Other operating expenses 416,768 372,052 359,958
Depreciation and amortization 253,142 232,176 224,223
Income (loss) from operations 190,242 228,232 232,700
Interest expense 118,692 106,152 105,061
Income taxes (17,191) 12,031 7,051
Net income (loss) 155,176 147,334 129,488
Capital expenditures 452,829 441,209 405,674
Total Assets 7,417,350 6,853,583 6,402,097
Avista Utilities [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 1,663,815 1,392,999 1,277,468
Alaska Electric Light & Power [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 45,704 45,366 42,809
Operating Segments [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 1,709,519 1,438,365 1,320,277
Resource costs 735,862 497,123 398,509
Other operating expenses 405,165 366,125 354,614
Depreciation and amortization 253,017 231,915 223,507
Income (loss) from operations 201,282 233,849 237,146
Interest expense 118,173 105,725 104,723
Income taxes (25,031) 8,792 7,932
Net income (loss) 125,446 132,782 132,905
Capital expenditures 451,995 439,939 404,306
Total Assets 7,240,486 6,723,666 6,304,311
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 1,663,815 1,392,999 1,277,468
Resource costs 732,298 493,289 396,543
Other operating expenses 390,597 352,241 341,709
Depreciation and amortization 242,198 221,552 213,701
Income (loss) from operations 185,582 217,663 220,058
Interest expense 112,213 99,629 98,451
Income taxes (27,368) 6,029 4,921
Net income (loss) 117,901 125,558 124,810
Capital expenditures 443,373 435,887 397,292
Total Assets 6,976,164 6,458,244 6,035,340
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 45,704 45,366 42,809
Resource costs 3,564 3,834 1,966
Other operating expenses 14,568 13,884 12,905
Depreciation and amortization 10,819 10,363 9,806
Income (loss) from operations 15,700 16,186 17,088
Interest expense 5,960 6,096 6,272
Income taxes 2,337 2,763 3,011
Net income (loss) 7,545 7,224 8,095
Capital expenditures 8,622 4,052 7,014
Total Assets 264,322 265,422 268,971
Other [Member] | Non-Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 688 571 1,614
Resource costs 0 0 0
Other operating expenses 11,603 5,927 5,344
Depreciation and amortization 125 261 716
Income (loss) from operations (11,040) (5,617) (4,446)
Interest expense 791 522 524
Income taxes 7,840 3,239 (881)
Net income (loss) 29,730 14,552 (3,417)
Capital expenditures 834 1,270 1,368
Total Assets 187,027 132,158 109,658
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 (272) (95) (186)
Income taxes 0 0 0
Net income (loss) 0 0 0
Capital expenditures 0 0 0
Total Assets $ (10,163) $ (2,241) $ (11,872)