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Shareholders' equity (Tables)
 12 Months Ended
Dec. 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 losses on derivatives
 
 Retirement benefit plans
 
AOCI
Balance, December 31, 2013
$
(3,663
)
 
$
(525
)
 
$
(12,562
)
 
$
(16,750
)
 
$
—

 
$
608

 
$
608

Current period other comprehensive income (loss)
4,125

 
236

 
(14,989
)
 
(10,628
)
 
—

 
(563
)
 
(563
)
Balance, December 31, 2014
462

 
(289
)
 
(27,551
)
 
(27,378
)
 
—

 
45

 
45

Current period other comprehensive income (loss)
(2,334
)
 
235

 
3,215

 
1,116

 
—

 
880

 
880

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

 
925

 
925

Current period other comprehensive loss
(6,059
)
 
(400
)
 
(408
)
 
(6,867
)
 
(454
)
 
(793
)
 
(1,247
)
Balance, December 31, 2016
$
(7,931
)
 
$
(454
)
 
$
(24,744
)
 
$
(33,129
)
 
$
(454
)
 
$
132

 
(322
)
Reclassification Out of Accumulated Other Comprehensive Income
Reclassifications out of AOCI were as follows:
 
 
Amount reclassified from AOCI
 
 
Years ended December 31
 
2016
 
2015
 
2014
 
Affected line item in the Statement of Income
(in thousands)
 
 
 
 
 
 
 
 
HEI consolidated
 
 
 
 
 
 
 
 
Net realized gains on securities
 
$
(360
)
 
$
—

 
$
(1,715
)
 
Revenues-bank (net gains on sales of securities)
Derivatives qualified as cash flow hedges
 
 
 
 

 
 

 
 
Window forward contracts
 
(173
)
 
—

 
—

 
Revenues-electric utilities (gains on window forward contracts–see Note 4 for additional details)
Interest rate contracts (settled in 2011)
 
54

 
235

 
236

 
Interest expense
Retirement benefit plan items
 
 

 
 

 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
14,518

 
22,465

 
11,344

 
See Note 10 for additional details
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets
 
28,584

 
(25,139
)
 
207,833

 
See Note 10 for additional details
Total reclassifications
 
$
42,623

 
$
(2,439
)
 
$
217,698

 
 
Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
Derivatives qualified as cash flow hedges
 
 
 
 
 
 
 
 
Window forward contracts
 
(173
)
 
—

 
—

 
Revenues (gains on window forward contracts–see Note 4 for additional details)
Retirement benefit plan items
 
 

 
 

 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
$
13,254

 
$
20,381

 
$
10,212

 
See Note 10 for additional details
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets
 
28,584

 
(25,139
)
 
207,833

 
See Note 10 for additional details
Total reclassifications
 
$
41,665

 
$
(4,758
)
 
$
218,045