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Shareholders' equity - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Gain on sale of investment securities, net $ (8,123) $ (528) $ (9,275)
Bank revenues (3,741,985) (2,850,379) (2,579,775)
Interest expense 103,402 94,363 88,694
Hawaiian Electric Company, Inc. and Subsidiaries      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Bank revenues (3,408,587) (2,539,636) (2,265,320)
Net income (loss) (190,924) (179,637) (171,335)
Amount reclassified from AOCI      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) (176,112) (152,442) 61,911
Amount reclassified from AOCI | Hawaiian Electric Company, Inc. and Subsidiaries      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) (181,052) (151,884) 61,410
Amount reclassified from AOCI | Net unrealized gains (losses) on securities      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Gain on sale of investment securities, net 0 (387) (1,638)
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 3,993 0 0
Amount reclassified from AOCI | Net realized losses on derivatives qualifying as cash flow hedges      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Interest expense 172 37 0
Amount reclassified from AOCI | Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) 19,659 19,253 23,689
Amount reclassified from AOCI | Amortization of prior service credit and net losses 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) 18,884 19,461 21,550
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) (199,936) (171,345) 39,860
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) $ (199,936) $ (171,345) $ 39,860