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Shareholders' equity (Tables)
3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows:
HEI ConsolidatedHawaiian Electric Consolidated
 (in thousands) Net unrealized gains (losses) on securities Unrealized gains (losses) on derivativesRetirement benefit plansAOCIAOCI-Retirement benefit plans
Balance, December 31, 2023$(282,963)$1,638 $(8,025)$(289,350)$2,849 
Current period other comprehensive income (loss)(10,503)692 10 (9,801)(49)
Balance, March 31, 2024$(293,466)$2,330 $(8,015)$(299,151)$2,800 
Balance, December 31, 2022$(328,904)$1,991 $(9,115)$(336,028)$2,861 
Current period other comprehensive income (loss)20,282 138 68 20,488 (45)
Balance, March 31, 2023$(308,622)$2,129 $(9,047)$(315,540)$2,816 
Schedule of Reclassification out of AOCI
Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCIAffected line item in the
 Statements of Income / Balance Sheets
Three months ended March 31
(in thousands)20242023
HEI consolidated
Amortization of unrealized holding losses on held-to-maturity securities
$3,086 $3,677 Bank revenues
Net realized gains on derivatives qualifying as cash flow hedges
(48)(48)Interest expense
Retirement benefit plans:   
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost
(449)(357)
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets459 425 
See Note 9 for additional details
Total reclassifications$3,048 $3,697  
Hawaiian Electric consolidated
Retirement benefit plans:  
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost
$(508)$(470)
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets459 425 
See Note 9 for additional details
Total reclassifications$(49)$(45)