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Information by Business Segments - Schedule of Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Operating revenues $ 412,870 $ 390,230  
Resource costs 134,579 129,547  
Other operating expenses 88,739 95,856  
Depreciation and amortization 55,348 51,656  
Income (loss) from operations 101,895 82,193  
Interest expense 26,413 26,617  
Income taxes 12,164 8,532  
Net income (loss) 68,017 48,424  
Capital expenditures 97,231 95,635  
Total Assets 6,399,496   $ 6,402,097
Operating Segments [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 412,681 389,407  
Resource costs 134,579 129,547  
Other operating expenses 87,555 94,496  
Depreciation and amortization 55,221 51,421  
Income (loss) from operations 103,017 82,780  
Interest expense 26,325 26,572  
Income taxes 12,051 8,705  
Net income (loss) 67,534 49,374  
Capital expenditures 97,203 95,526  
Total Assets 6,302,056   6,304,311
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 399,860 377,205  
Resource costs 133,840 129,557  
Other operating expenses 84,599 91,279  
Depreciation and amortization 52,724 48,974  
Income (loss) from operations 96,693 76,534  
Interest expense 24,800 24,983  
Income taxes 10,718 7,404  
Net income (loss) 64,058 45,979  
Capital expenditures 96,394 94,056  
Total Assets 6,031,502   6,035,340
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 12,821 12,202  
Resource costs 739 (10)  
Other operating expenses 2,956 3,217  
Depreciation and amortization 2,497 2,447  
Income (loss) from operations 6,324 6,246  
Interest expense 1,525 1,589  
Income taxes 1,333 1,301  
Net income (loss) 3,476 3,395  
Capital expenditures 809 1,470  
Total Assets 270,554   268,971
Other [Member] | Non-Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 189 823  
Resource costs 0 0  
Other operating expenses 1,184 1,360  
Depreciation and amortization 127 235  
Income (loss) from operations (1,122) (587)  
Interest expense 129 131  
Income taxes 113 (173)  
Net income (loss) 483 (950)  
Capital expenditures 28 109  
Total Assets 110,117   109,658
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 (41) (86)  
Income taxes 0 0  
Net income (loss) 0 0  
Capital expenditures 0 $ 0  
Total Assets $ (12,677)   $ (11,872)