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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassifications out of accumulated other comprehensive income/(loss)        
Total revenues $ 646,055 $ 717,176 $ 1,763,259 $ 1,978,950
Interest expense 19,365 19,229 56,792 57,235
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,324, $3,583, $6,943 and $10,760 for the respective periods 3,641 5,611 10,877 16,850
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods (3,311) (5,091) (9,934) (15,274)
Electric utility        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total revenues 572,253 648,127 1,549,700 1,779,732
Hawaiian Electric Company, Inc. and Subsidiaries        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total revenues 572,253 648,127 1,549,700 1,779,732
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,324, $3,583, $6,943 and $10,760 for the respective periods 3,314 5,095 9,941 15,285
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods (3,311) (5,091) (9,934) (15,274)
Amount reclassified from AOCI        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 157 579 464 1,753
Amount reclassified from AOCI | Hawaiian Electric Company, Inc. and Subsidiaries        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications (170) 4 (166) 11
Amount reclassified from AOCI | Net unrealized gains (losses) on securities        
Reclassifications out of accumulated other comprehensive income/(loss)        
Net realized gains on securities 0 0 (360) 0
Amount reclassified from AOCI | Derivatives qualified as cash flow hedges Interest rate contracts (settled in 2011) | Forward sale contracts | Electric utility        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total revenues (173) 0 (173) 0
Amount reclassified from AOCI | Derivatives qualified as cash flow hedges Interest rate contracts (settled in 2011) | Interest rate contracts        
Reclassifications out of accumulated other comprehensive income/(loss)        
Interest expense 0 59 54 177
Amount reclassified from AOCI | Derivatives qualified as cash flow hedges Interest rate contracts (settled in 2011) | Hawaiian Electric Company, Inc. and Subsidiaries | Forward sale contracts | Electric utility        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total revenues (173) 0 (173) 0
Amount reclassified from AOCI | Retirement benefit plans        
Reclassifications out of accumulated other comprehensive income/(loss)        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,324, $3,583, $6,943 and $10,760 for the respective periods 3,641 5,611 10,877 16,850
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods (3,311) (5,091) (9,934) (15,274)
Amount reclassified from AOCI | Retirement benefit plans | Hawaiian Electric Company, Inc. and Subsidiaries        
Reclassifications out of accumulated other comprehensive income/(loss)        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,324, $3,583, $6,943 and $10,760 for the respective periods 3,314 5,095 9,941 15,285
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods $ (3,311) $ (5,091) $ (9,934) $ (15,274)