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Shareholders' equity (Tables)
 3 Months Ended
Mar. 31, 2016
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 on derivatives
 
Retirement benefit plans
 
AOCI
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

Balance, December 31, 2014
$
462

 
$
(289
)
 
$
(27,551
)
 
$
(27,378
)
 
$
—

 
$
45

 
$
45

Current period other comprehensive income
3,451

 
59

 
548

 
4,058

 
—

 
22

 
22

Balance, March 31, 2015
$
3,913

 
$
(230
)
 
$
(27,003
)
 
$
(23,320
)
 
$
—

 
$
67

 
$
67
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)
 
2016
 
2015
 
 Statement of Income
HEI consolidated
 
 
 
 
 
 
Derivatives qualified as cash flow hedges
 
 

 
 

 
 
Interest rate contracts (settled in 2011)
 
$
54

 
$
59

 
Interest expense
Retirement benefit plan items
 
 

 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
3,537

 
5,459

 
See Note 6 for additional details
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets
 
(3,222
)
 
(4,911
)
 
See Note 6 for additional details
Total reclassifications
 
$
369

 
$
607

 
 
Hawaiian Electric consolidated
 
 
 
 
 
 
Retirement benefit plan items
 
 
 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
$
3,236

 
$
4,933

 
See Note 6 for additional details
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets
 
(3,222
)
 
(4,911
)
 
See Note 6 for additional details
Total reclassifications
 
$
14

 
$
22