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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Increase (decrease) in stockholders' equity            
Beginning Balance $ 2,183,515 $ 2,162,280 $ 2,091,777 $ 2,097,386 $ 2,162,280 $ 2,097,386
Net income for common stock 42,512 45,688 46,054 40,247 88,200 86,301
Other comprehensive income, net of taxes 13,699 9,241 (3,825) (12,773) 22,940 (16,598)
Common stock dividends (34,860) (34,860) (33,740) (33,741)    
Ending Balance 2,208,586 2,183,515 2,103,018 2,091,777 2,208,586 2,103,018
Consolidating adjustments            
Increase (decrease) in stockholders' equity            
Beginning Balance (582,374) (576,838) (559,511) (557,013) (576,838) (557,013)
Net income for common stock (8,086) (11,849) (9,080) (9,325) (19,935) (18,405)
Other comprehensive income, net of taxes (1) (1) (1) 0 (2) (1)
Common stock dividends 6,312 6,312 6,827 6,827    
Common stock issuance expenses   2 1 0    
Ending Balance (584,149) (582,374) (561,764) (559,511) (584,149) (561,764)
Hawaiian Electric (parent only) | Reportable Legal Entities            
Increase (decrease) in stockholders' equity            
Beginning Balance 1,964,478 1,957,641 1,846,955 1,845,283 1,957,641 1,845,283
Net income for common stock 32,574 32,126 31,169 27,475 64,700 58,644
Other comprehensive income, net of taxes 23 24 26 31 47 57
Common stock dividends (25,313) (25,313) (25,826) (25,826)    
Common stock issuance expenses   0 0 (8)    
Ending Balance 1,971,762 1,964,478 1,852,324 1,846,955 1,971,762 1,852,324
HELCO | Reportable Legal Entities            
Increase (decrease) in stockholders' equity            
Beginning Balance 298,497 295,874 288,927 286,647 295,874 286,647
Net income for common stock 4,666 5,169 3,763 6,101 9,835 9,864
Other comprehensive income, net of taxes 1 1 1 0 2 1
Common stock dividends (2,545) (2,545) (3,823) (3,821)    
Common stock issuance expenses   (2) (3) 0    
Ending Balance 300,619 298,497 288,865 288,927 300,619 288,865
Maui Electric | Reportable Legal Entities            
Increase (decrease) in stockholders' equity            
Beginning Balance 283,776 280,863 270,483 270,265 280,863 270,265
Net income for common stock 3,420 6,680 5,317 3,224 10,100 8,541
Other comprehensive income, net of taxes 0 0 0 0 0 0
Common stock dividends (3,767) (3,767) (3,004) (3,006)    
Common stock issuance expenses   0 2 0    
Ending Balance 283,429 283,776 272,798 270,483 283,429 272,798
Other subsidiaries | Reportable Legal Entities            
Increase (decrease) in stockholders' equity            
Beginning Balance 101 101 101 101 101 101
Net income for common stock 0 0 0 0 0 0
Other comprehensive income, net of taxes 0 0 0 0 0 0
Common stock dividends 0 0 0 0    
Common stock issuance expenses   0 0 0    
Ending Balance 101 101 101 101 101 101
Hawaiian Electric Company, Inc. and Subsidiaries            
Increase (decrease) in stockholders' equity            
Beginning Balance 1,964,478 1,957,641 1,846,955 1,845,283 1,957,641 1,845,283
Net income for common stock 32,574 32,126 31,169 27,475 64,700 58,644
Other comprehensive income, net of taxes 23 24 26 31 47 57
Common stock dividends (25,313) (25,313) (25,826) (25,826)    
Common stock issuance expenses   0 0 (8)    
Ending Balance $ 1,971,762 $ 1,964,478 $ 1,852,324 $ 1,846,955 $ 1,971,762 $ 1,852,324