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Income taxes - Components of Income Taxes Attributable to Net Income for Common Stock (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Federal      
Federal current taxes $ 59,873 $ 44,343 $ (8,959)
Federal deferred taxes 43,666 36,664 91,412
Deferred tax credits, net 268 318 0
Federal taxes 103,807 81,325 82,453
State      
Current 16,473 2,402 (5,793)
Deferred 3,452 4,768 12,813
Deferred tax credits, net (37) 4,526 6,106
State taxes 19,888 11,696 13,126
Federal and state taxes 123,695 93,021 95,579
Hawaiian Electric Company, Inc. and Subsidiaries      
Federal      
Federal current taxes 952 0 1,108
Federal deferred taxes 70,513 68,757 68,775
Deferred tax credits, net 268 318 0
Federal taxes 71,733 69,075 69,883
State      
Current 9,232 (1,048) (9,436)
Deferred 3,873 6,869 14,172
Deferred tax credits, net (37) 4,526 6,106
State taxes 13,068 10,347 10,842
Federal and state taxes $ 84,801 $ 79,422 $ 80,725