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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Federal      
Federal current taxes $ 44,343 $ (8,959) $ (295)
Federal deferred taxes 36,664 91,412 73,473
Deferred tax credits, net 318 0 224
Federal taxes 81,325 82,453 73,402
State      
Current 2,402 (5,793) (630)
Deferred 4,768 12,813 6,672
Deferred tax credits, net 4,526 6,106 6,793
State taxes 11,696 13,126 12,835
Federal and state taxes 93,021 95,579 86,237
Hawaiian Electric Company, Inc. and Subsidiaries      
Federal      
Federal current taxes 0 1,108 1,313
Federal deferred taxes 68,757 68,775 58,024
Deferred tax credits, net 318 0 224
Federal taxes 69,075 69,883 59,561
State      
Current (1,048) (9,436) (3,720)
Deferred 6,869 14,172 6,483
Deferred tax credits, net 4,526 6,106 6,793
State taxes 10,347 10,842 9,556
Federal and state taxes $ 79,422 $ 80,725 $ 69,117