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Segment financial information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment financial information      
Revenues $ 785,068 $ 642,946  
Income (loss) before income taxes 87,480 80,196  
Income taxes (benefit) 17,840 15,365  
Net income attributable to Hawaiian Electric 69,640 64,831  
Preferred stock dividends of Hawaiian Electric 473 473  
Net income for common stock 69,167 64,358  
Total assets 15,908,429   $ 15,822,637
Revenues from external customers      
Segment financial information      
Revenues 785,068 642,946  
Intersegment revenues (eliminations)      
Segment financial information      
Revenues 0 0  
Electric utility      
Segment financial information      
Revenues 708,792 564,864  
Income (loss) before income taxes 59,446 55,090  
Income taxes (benefit) 12,538 11,233  
Net income attributable to Hawaiian Electric 46,908 43,857  
Preferred stock dividends of Hawaiian Electric 499 499  
Net income for common stock 46,409 43,358  
Total assets 6,535,176   6,491,625
Electric utility | Revenues from external customers      
Segment financial information      
Revenues 708,788 564,855  
Electric utility | Intersegment revenues (eliminations)      
Segment financial information      
Revenues 4 9  
Bank      
Segment financial information      
Revenues 75,115 77,131  
Income (loss) before income taxes 30,215 37,102  
Income taxes (benefit) 6,345 7,546  
Net income attributable to Hawaiian Electric 23,870 29,556  
Preferred stock dividends of Hawaiian Electric 0 0  
Net income for common stock 23,870 29,556  
Total assets 9,252,325   9,181,603
Bank | Revenues from external customers      
Segment financial information      
Revenues 75,115 77,131  
Bank | Intersegment revenues (eliminations)      
Segment financial information      
Revenues 0 0  
Other      
Segment financial information      
Revenues 1,161 951  
Income (loss) before income taxes (2,181) (11,996)  
Income taxes (benefit) (1,043) (3,414)  
Net income attributable to Hawaiian Electric (1,138) (8,582)  
Preferred stock dividends of Hawaiian Electric (26) (26)  
Net income for common stock (1,112) (8,556)  
Total assets 120,928   $ 149,409
Other | Revenues from external customers      
Segment financial information      
Revenues 1,165 960  
Other | Intersegment revenues (eliminations)      
Segment financial information      
Revenues $ (4) $ (9)