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Shareholders' equity (Tables)
3 Months Ended
Mar. 31, 2020
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, 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) $(1,253) 
Balance, December 31, 2018$(24,423) $(436) $(25,751) $(50,610) $99  
Current period other comprehensive income (loss)9,439  (403) 205  9,241  24  
Balance, March 31, 2019$(14,984) $(839) $(25,546) $(41,369) $123  
Schedule of reclassifications out of accumulated other comprehensive income/(loss)
Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCI 
 Three months ended March 31Affected line item in the
(in thousands)20202019 Statements of Income / Balance Sheets
HEI consolidated
Retirement benefit plans:   
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost$5,706  $2,503  
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets(5,158) (2,298) 
See Note 8 for additional details
Total reclassifications$548  $205   
Hawaiian Electric consolidated
Retirement benefit plans:  
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost$5,184  $2,322  
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets(5,158) (2,298) 
See Note 8 for additional details
Total reclassifications$26  $24