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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Federal      
Current $ 61,534 $ 59,873 $ 44,343
Deferred 33,967 43,666 36,664
Deferred tax credits, net (20) 268 318
Federal taxes 95,481 103,807 81,325
State      
Current 10,076 16,473 2,402
Deferred 3,868 3,452 4,768
Deferred tax credits, net (32) (37) 4,526
State taxes 13,912 19,888 11,696
Federal and state taxes 109,393 123,695 93,021
Hawaiian Electric Company, Inc. and Subsidiaries      
Federal      
Current 36,267 952 0
Deferred 35,229 70,513 68,757
Deferred tax credits, net (20) 268 318
Federal taxes 71,476 71,733 69,075
State      
Current 8,947 9,232 (1,048)
Deferred 2,808 3,873 6,869
Deferred tax credits, net (32) (37) 4,526
State taxes 11,723 13,068 10,347
Federal and state taxes $ 83,199 $ 84,801 $ 79,422