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Segment financial information - Segment Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment financial information      
Revenues $ 897,158 $ 928,237  
Income (loss) before income taxes 54,269 70,304  
Income taxes (benefit) 11,674 15,110  
Net income (loss) 42,595 55,194  
Preferred stock dividends of Hawaiian Electric 473 473  
Net income for common stock 42,122 54,721  
Total assets 16,923,208   $ 17,243,821
Electric utility      
Segment financial information      
Revenues 788,578 830,361  
Income (loss) before income taxes 50,900 61,108  
Income taxes (benefit) 11,180 13,600  
Net income (loss) 39,720 47,508  
Preferred stock dividends of Hawaiian Electric 499 499  
Net income for common stock 39,221 47,009  
Total assets 7,274,862   7,283,554
Bank      
Segment financial information      
Revenues 105,144 93,857  
Income (loss) before income taxes 25,813 23,707  
Income taxes (benefit) 4,879 5,145  
Net income (loss) 20,934 18,562  
Preferred stock dividends of Hawaiian Electric 0 0  
Net income for common stock 20,934 18,562  
Total assets 9,360,229   9,673,192
Other      
Segment financial information      
Revenues 3,436 4,019  
Income (loss) before income taxes (22,444) (14,511)  
Income taxes (benefit) (4,385) (3,635)  
Net income (loss) (18,059) (10,876)  
Preferred stock dividends of Hawaiian Electric (26) (26)  
Net income for common stock (18,033) $ (10,850)  
Total assets $ 288,117   $ 287,075