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Shareholders' equity (Tables)
 6 Months Ended
Jun. 30, 2017
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
 
Unrealized gains (losses) on derivatives
 
Retirement benefit plans
 
AOCI
Balance, December 31, 2016
$
(7,931
)
 
$
(454
)
 
$
(24,744
)
 
$
(33,129
)
 
$
(454
)
 
$
132

 
$
(322
)
Current period other comprehensive income
2,244

 
454

 
657

 
3,355

 
454

 
45

 
499

Balance, June 30, 2017
$
(5,687
)
 
$
—

 
$
(24,087
)
 
$
(29,774
)
 
$
—

 
$
177

 
$
177

Balance, December 31, 2015
$
(1,872
)
 
$
(54
)
 
$
(24,336
)
 
$
(26,262
)
 
$
—

 
$
925

 
$
925

Current period other comprehensive income
9,984

 
311

 
613

 
10,908

 
257

 
4

 
261

Balance, June 30, 2016
$
8,112

 
$
257

 
$
(23,723
)
 
$
(15,354
)
 
$
257

 
$
929

 
$
1,186
Schedule of reclassifications out of accumulated other comprehensive income/(loss)
Reclassifications out of AOCI were as follows:
 
 
Amount reclassified from AOCI
 
Amount reclassified from AOCI
 
 
 
 
Three months ended June 30
 
Six months ended June 30
 
Affected line item in the
(in thousands)
 
2017
 
2016
 
2017
 
2016
 
 Statements of Income / Balance Sheets
HEI consolidated
 
 
 
 
 
 
 
 
 
 
Net realized gains on securities included in net income
 
$
—

 
$
(360
)
 
$
—

 
$
(360
)
 
Revenues-bank (net gains on sales of securities)
Derivatives qualifying as cash flow hedges:
 
 

 
 

 
 

 
 

 
 
Window forward contracts
 
—

 
—

 
454

 
—

 
Construction in progress-electric utilities (losses on window forward contracts - see Note 3 for additional details)
Interest rate contracts (settled in 2011)
 
—

 
—

 
—

 
54

 
Interest expense
Retirement benefit plans:
 
 

 
 

 
 

 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
3,930

 
3,698

 
7,851

 
7,236

 
See Note 7 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(3,581
)
 
(3,401
)
 
(7,194
)
 
(6,623
)
 
See Note 7 for additional details
Total reclassifications
 
$
349

 
$
(63
)
 
$
1,111

 
$
307

 
 
Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
Derivatives qualifying as cash flow hedges:
 
 
 
 
 
 
 
 
 
 
Window forward contracts
 
$
—

 
$
—

 
$
454

 
$
—

 
Construction in progress (losses on window forward contracts - see Note 3 for additional details)
Retirement benefit plans:
 
 
 
 

 
 
 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
3,621

 
3,391

 
7,239

 
6,627

 
See Note 7 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(3,581
)
 
(3,401
)
 
(7,194
)
 
(6,623
)
 
See Note 7 for additional details
Total reclassifications
 
$
40

 
$
(10
)
 
$
499

 
$
4