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Shareholders' equity (Tables)
 3 Months Ended
Mar. 31, 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
223

 
454

 
308

 
985

 
454

 
5

 
459

Balance, March 31, 2017
$
(7,708
)
 
$
—

 
$
(24,436
)
 
$
(32,144
)
 
$
—

 
$
137

 
$
137

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

 
$
925

 
$
925

Current period other comprehensive income
7,428

 
1,056

 
316

 
8,800

 
1,002

 
14

 
1,016

Balance, March 31, 2016
$
5,556

 
$
1,002

 
$
(24,020
)
 
$
(17,462
)
 
$
1,002

 
$
939

 
$
1,941
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 31
 
Affected line item in the
(in thousands)
 
2017
 
2016
 
 Statement of Income
HEI consolidated
 
 
 
 
 
 
Derivatives qualifying as cash flow hedges
 
 

 
 

 
 
Window forward contracts
 
$
454

 
$
—

 
Revenue-electric utilities (losses on window forward contracts - see Note 4 for additional details)
Interest rate contracts (settled in 2011)
 
$
—

 
$
54

 
Interest expense
Retirement benefit plan items
 
 

 
 

 
 
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
3,921

 
3,537

 
See Note 6 for additional details
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets
 
(3,613
)
 
(3,222
)
 
See Note 6 for additional details
Total reclassifications
 
$
762

 
$
369

 
 
Hawaiian Electric consolidated
 
 
 
 
 
 
Derivatives qualifying as cash flow hedges
 
 
 
 
 
 
Window forward contracts
 
$
454

 
$
—

 
Revenue (losses on window forward contracts - see Note 4 for additional details)
Retirement benefit plan items
 
 
 
 

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

 
3,236

 
See Note 6 for additional details
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets
 
(3,613
)
 
(3,222
)
 
See Note 6 for additional details
Total reclassifications
 
$
459

 
$
14