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Shareholders' equity
 9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Shareholders' equity Shareholders' equity
Accumulated other comprehensive income/(loss).  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, 2022$(328,904)$1,991 $(9,115)$(336,028)$2,861 
Current period other comprehensive income (loss)(21,330)(827)161 (21,996)(166)
Balance, September 30, 2023$(350,234)$1,164 $(8,954)$(358,024)$2,695 
Balance, December 31, 2021$(32,037)$(3,638)$(16,858)$(52,533)$(3,280)
Current period other comprehensive income (loss)(308,229)6,561 657 (301,011)210 
Balance, September 30, 2022$(340,266)$2,923 $(16,201)$(353,544)$(3,070)

Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCIAffected line item in the
 Statements of Income / Balance Sheets
Three months ended September 30Nine months ended September 30
(in thousands)2023202220232022
HEI consolidated
Net unrealized gains (losses) on available-for sale investment securities - amortization of unrealized holding losses on held-to-maturity securities$3,699 $— $11,065 $— Bank revenues
Net realized losses (gains) on derivatives qualifying as cash flow hedges(47)53 (143)161 Interest expense
Retirement benefit plans:     
Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost(446)5,606 (1,160)10,229 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets470 (5,303)1,321 (9,572)
See Note 9 for additional details
Total reclassifications$3,676 $356 $11,083 $818  
Hawaiian Electric consolidated
Retirement benefit plans:   
Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost$(547)$5,411 $(1,487)$9,782 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets470 (5,303)1,321 (9,572)
See Note 9 for additional details
Total reclassifications$(77)$108 $(166)$210