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Shareholders' equity
 6 Months Ended
Jun. 30, 2020
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, 2019$2,481  $(1,613) $(20,907) $(20,039) $(1,279) 
Current period other comprehensive income (loss)18,783  (1,982) 1,079  17,880  51  
Balance, June 30, 2020$21,264  $(3,595) $(19,828) $(2,159) $(1,228) 
Balance, December 31, 2018$(24,423) $(436) $(25,751) $(50,610) $99  
Current period other comprehensive income (loss)23,593  (1,063) 410  22,940  47  
Balance, June 30, 2019$(830) $(1,499) $(25,341) $(27,670) $146  

Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCI 
 Three months ended June 30Six months ended June 30Affected line item in the
(in thousands)2020201920202019 Statements of Income / Balance Sheets
HEI consolidated
Net realized gains on securities included in net income$(1,638) $—  $(1,638) $—  Gain on sale of investment securities, net
Retirement benefit plans:     
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost5,690  2,503  11,396  5,006  
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets(5,159) (2,298) (10,317) (4,596) 
See Note 8 for additional details
Total reclassifications$(1,107) $205  $(559) $410   
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  $2,321  $10,368  $4,643  
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets(5,159) (2,298) (10,317) (4,596) 
See Note 8 for additional details
Total reclassifications$25  $23  $51  $47