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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassifications out of accumulated other comprehensive income/(loss)        
Gain on sale of investment securities, net $ 0 $ 0 $ (528) $ (9,275)
Interest expense 23,477 22,086 70,530 66,474
Total reclassifications (63,886) (65,503) (193,062) (148,756)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 63 603 72 44
Hawaiian Electric Company, Inc. and Subsidiaries        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications (50,840) (60,563) (137,097) (127,795)
Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 106 48 175 99
Net realized gains on securities included in net income | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Gain on sale of investment securities, net 0 0 (387) (1,638)
Net realized losses on derivatives qualifying as cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Interest expense 9 0 9 0
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 2,853 6,324 14,871 17,720
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost | Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 2,905 5,769 14,596 16,137
Impact of D&Os of the PUC included in regulatory assets | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications (2,799) (5,721) (14,421) (16,038)
Impact of D&Os of the PUC included in regulatory assets | Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications $ (2,799) $ (5,721) $ (14,421) $ (16,038)