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Shareholders' equity (Tables)
3 Months Ended
Mar. 31, 2021
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, 2020$19,986 $(3,363)$(17,887)$(1,264)$(2,919)
Current period other comprehensive income (loss)(45,777)1,562 199 (44,016)34 
Balance, March 31, 2021$(25,791)$(1,801)$(17,688)$(45,280)$(2,885)
Balance, December 31, 2019$2,481 $(1,613)$(20,907)$(20,039)$(1,279)
Current period other comprehensive income (loss)19,448 (1,784)548 18,212 26 
Balance, March 31, 2020$21,929 $(3,397)$(20,359)$(1,827)$(1,253)
Schedule of reclassifications out of accumulated other comprehensive income/(loss)
Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCIAffected line item in the
 Statements of Income / Balance Sheets
Three months ended March 3120212020
(in thousands)
HEI consolidated
Net realized gains on securities included in net income$(387)$— Gain on sale of investment securities, net
Retirement benefit plans:   
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost6,010 5,706 
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets(5,811)(5,158)
See Note 8 for additional details
Total reclassifications$(188)$548  
Hawaiian Electric consolidated
Retirement benefit plans:  
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost$5,845 $5,184 
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets(5,811)(5,158)
See Note 8 for additional details
Total reclassifications$34 $26