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Shareholders' equity (Tables)
 9 Months Ended
Sep. 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
2,452

 
454

 
1,003

 
3,909

 
454

 
67

 
521

Balance, September 30, 2017
$
(5,479
)
 
$
—

 
$
(23,741
)
 
$
(29,220
)
 
$
—

 
$
199

 
$
199

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

 
$
925

 
$
925

Current period other comprehensive income
7,837

 
459

 
943

 
9,239

 
405

 
7

 
412

Balance, September 30, 2016
$
5,965

 
$
405

 
$
(23,393
)
 
$
(17,023
)
 
$
405

 
$
932

 
$
1,337
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)
 
2017
 
2016
 
2017
 
2016
 
 Statements of Income / Balance Sheets
HEI consolidated
 
 
 
 
 
 
 
 
 
 
Net realized gains on securities included in net income
 
$
—

 
$
—

 
$
—

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

 
 

 
 

 
 

 
 
Window forward contracts
 
—

 
(173
)
 
454

 
(173
)
 
Property, plant and equipment-electric utilities
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
 
3,942

 
3,641

 
11,793

 
10,877

 
See Note 7 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(3,596
)
 
(3,311
)
 
(10,790
)
 
(9,934
)
 
See Note 7 for additional details
Total reclassifications
 
$
346

 
$
157

 
$
1,457

 
$
464

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

 
$
(173
)
 
$
454

 
$
(173
)
 
Construction in progress
Retirement benefit plans:
 
 
 
 

 
 
 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
3,618

 
3,314

 
10,857

 
9,941

 
See Note 7 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(3,596
)
 
(3,311
)
 
(10,790
)
 
(9,934
)
 
See Note 7 for additional details
Total reclassifications
 
$
22

 
$
(170
)
 
$
521

 
$
(166
)