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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Increase (decrease) in stockholders' equity    
Beginning Balance $ 2,337,502 $ 2,280,260
Net income for common stock 64,358 33,420
Other comprehensive income, net of taxes (44,016) 18,212
Common stock dividends (37,156) (36,019)
Ending Balance 2,321,293 2,276,505
Consolidating adjustments    
Increase (decrease) in stockholders' equity    
Beginning Balance (626,891) (591,969)
Net income for common stock (12,510) (8,804)
Other comprehensive income, net of taxes (1) (1)
Common stock dividends 7,426 7,676
Common stock issuance expenses   1
Ending Balance (631,976) (593,097)
Hawaiian Electric (parent only) | Reportable Legal Entities    
Increase (decrease) in stockholders' equity    
Beginning Balance 2,141,918 2,047,352
Net income for common stock 43,358 23,905
Other comprehensive income, net of taxes 34 26
Common stock dividends (27,925) (26,784)
Ending Balance 2,157,385 2,044,499
Hawaii Electric Light | Reportable Legal Entities    
Increase (decrease) in stockholders' equity    
Beginning Balance 317,451 298,998
Net income for common stock 6,692 6,067
Other comprehensive income, net of taxes 1 1
Common stock dividends (3,650) (4,080)
Ending Balance 320,494 300,986
Maui Electric | Reportable Legal Entities    
Increase (decrease) in stockholders' equity    
Beginning Balance 309,363 292,870
Net income for common stock 5,818 2,737
Other comprehensive income, net of taxes 0 0
Common stock dividends (3,776) (3,596)
Common stock issuance expenses   (1)
Ending Balance 311,405 292,010
Other subsidiaries | Reportable Legal Entities    
Increase (decrease) in stockholders' equity    
Beginning Balance 77 101
Net income for common stock 0 0
Other comprehensive income, net of taxes 0 0
Ending Balance 77 101
Hawaiian Electric Consolidated    
Increase (decrease) in stockholders' equity    
Beginning Balance 2,141,918 2,047,352
Net income for common stock 43,358 23,905
Other comprehensive income, net of taxes 34 26
Common stock dividends (27,925) (26,784)
Common stock issuance expenses   0
Ending Balance $ 2,157,385 $ 2,044,499