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Shareholders' equity - Schedule of Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Loss (gain) on sale of investment securities, net and equity-method investment $ 15,609 $ (8,123) $ (528)
Bank revenues (3,682,166) (3,741,985) (2,850,379)
Interest expense 125,532 103,402 94,363
Hawaiian Electric Company, Inc. and Subsidiaries      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Bank revenues (3,269,521) (3,408,587) (2,539,636)
Net income (loss) (195,947) (190,924) (179,637)
Amount reclassified from AOCI      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) 15,402 (176,112) (152,442)
Amount reclassified from AOCI | Hawaiian Electric Company, Inc. and Subsidiaries      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) (10,187) (181,052) (151,884)
Amount reclassified from AOCI | Net unrealized gains (losses) on securities      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Loss (gain) on sale of investment securities, net and equity-method investment 10,954 0 (387)
Amount reclassified from AOCI | Amortization of unrealized holding losses on held-to-maturity securities      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Bank revenues 14,398 3,993 0
Amount reclassified from AOCI | Net realized losses (gains) on derivatives qualifying as cash flow hedges      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Interest expense (186) 172 37
Amount reclassified from AOCI | Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) (1,560) 19,659 19,253
Amount reclassified from AOCI | Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost | Hawaiian Electric Company, Inc. and Subsidiaries      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) (1,983) 18,884 19,461
Amount reclassified from AOCI | Impact of D&Os of the PUC included in regulatory assets      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) (8,204) (199,936) (171,345)
Amount reclassified from AOCI | Impact of D&Os of the PUC included in regulatory assets | Hawaiian Electric Company, Inc. and Subsidiaries      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) $ (8,204) $ (199,936) $ (171,345)