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Shareholders' equity
 6 Months Ended
Jun. 30, 2022
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, 2021$(32,037)$(3,638)$(16,858)$(52,533)$(3,280)
Current period other comprehensive income (loss)(209,264)3,911 354 (204,999)102 
Balance, June 30, 2022$(241,301)$273 $(16,504)$(257,532)$(3,178)
Balance, December 31, 2020$19,986 $(3,363)$(17,887)$(1,264)$(2,919)
Current period other comprehensive income (loss)(28,801)861 396 (27,544)69 
Balance, June 30, 2021$(8,815)$(2,502)$(17,491)$(28,808)$(2,850)

Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCIAffected line item in the
 Statements of Income / Balance Sheets
Three months ended June 30Six months ended June 30
(in thousands)2022202120222021
HEI consolidated
Net realized gains on securities included in net income$— $— $— $(387)Gain on sale of investment securities, net
Net realized losses on derivatives qualifying as cash flow hedges53 — 108 — Interest expense
Retirement benefit plans:     
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost122 6,008 4,623 12,018 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets56 (5,811)(4,269)(11,622)
See Note 9 for additional details
Total reclassifications$231 $197 $462 $9  
Hawaiian Electric consolidated
Retirement benefit plans:   
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost$(5)$5,846 $4,371 $11,691 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets56 (5,811)(4,269)(11,622)
See Note 9 for additional details
Total reclassifications$51 $35 $102 $69