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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Federal      
Current $ 23,207 $ 28,736 $ 42,903
Deferred (4,215) (4,353) (6,099)
Deferred tax credits, net 10,979 13,410 (12)
Federal taxes 29,971 37,793 36,792
State      
Current 8,430 10,472 17,361
Deferred 2,509 (10,732) (3,269)
Deferred tax credits, net 0 14,104 (87)
State taxes 10,939 13,844 14,005
Total 40,910 51,637 50,797
Hawaiian Electric Company, Inc. and Subsidiaries      
Federal      
Current 31,950 21,751 29,649
Deferred (5,408) (7,793) (5,245)
Deferred tax credits, net 1,549 13,155 (12)
Federal taxes 28,091 27,113 24,392
State      
Current 3,768 5,579 13,210
Deferred 8,559 (8,491) (2,737)
Deferred tax credits, net 0 14,104 (87)
State taxes 12,327 11,192 10,386
Total $ 40,418 $ 38,305 $ 34,778