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Shareholders' equity (Tables)
 9 Months Ended
Sep. 30, 2019
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 Consolidated
 
Hawaiian Electric Consolidated
 (in thousands)
 Net unrealized gains (losses) on securities
 
 Unrealized gains (losses) on derivatives
 
Retirement benefit plans
 
AOCI
 
AOCI-Retirement benefit plans
Balance, December 31, 2018
$
(24,423
)
 
$
(436
)
 
$
(25,751
)
 
$
(50,610
)
 
$
99

Current period other comprehensive income (loss)
27,368

 
(1,663
)
 
532

 
26,237

 
73

Balance, September 30, 2019
$
2,945

 
$
(2,099
)
 
$
(25,219
)
 
$
(24,373
)
 
$
172

Balance, December 31, 2017
$
(14,951
)
 
$
—

 
$
(26,990
)
 
$
(41,941
)
 
$
(1,219
)
Current period other comprehensive income (loss)
(22,768
)
 
—

 
1,581

 
(21,187
)
 
85

Balance, September 30, 2018
$
(37,719
)
 
$
—

 
$
(25,409
)
 
$
(63,128
)
 
$
(1,134
)
Schedule of reclassifications out of accumulated other comprehensive income/(loss)
Reclassifications out of AOCI were as follows:
 
 
Amount reclassified from AOCI
 
 
 
 
Three months ended September 30
 
Nine months ended September 30
 
Affected line item in the
(in thousands)
 
2019
 
2018
 
2019
 
2018
 
 Statements of Income / Balance Sheets
HEI consolidated
 
 
 
 
 
 
 
 
 
 
Net realized gains on securities included in net income
 
$
(478
)
 
$
—

 
$
(478
)
 
$
—

 
Revenues-bank (gains 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 cost
 
2,615

 
5,259

 
7,621

 
15,755

 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(2,493
)
 
(4,725
)
 
(7,089
)
 
(14,174
)
 
See Note 9 for additional details
Total reclassifications
 
$
(356
)
 
$
534

 
$
54

 
$
1,581

 
 
Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
Retirement benefit plans:
 
 
 
 

 
 
 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
$
2,519

 
$
4,753

 
$
7,162

 
$
14,259

 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(2,493
)
 
(4,725
)
 
(7,089
)
 
(14,174
)
 
See Note 9 for additional details
Total reclassifications
 
$
26

 
$
28

 
$
73

 
$
85