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Bank segment - Comprehensive income data (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Condensed Statement of Income Captions [Line Items]        
Net income for common stock $ 46,054 $ 38,661 $ 86,301 $ 72,854
Net unrealized gains (losses) on securities:        
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of tax benefits (taxes) of $1,592, $(1,334), $6,459 and $(1,482), respectively (4,348) 2,021 (17,645) 2,244
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $133, $133, $827 and $537, respectively 5,350 3,930 10,496 7,851
Other comprehensive income (loss), net of taxes (3,825) 2,370 (16,598) 3,355
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 42,229 41,031 69,703 76,209
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits 1,592 (1,334) 6,459 (1,482)
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) (1,862) (2,508) (3,654) (5,010)
American Savings Bank (ASB)        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 20,561 16,733 39,521 32,546
Net unrealized gains (losses) on securities:        
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of tax benefits (taxes) of $1,592, $(1,334), $6,459 and $(1,482), respectively (4,348) 2,021 (17,645) 2,244
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $133, $133, $827 and $537, respectively 366 202 1,588 814
Other comprehensive income (loss), net of taxes (3,982) 2,223 (16,057) 3,058
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 16,579 18,956 23,464 35,604
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits 1,592 (1,334) 6,459 (1,482)
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) $ (133) $ (133) $ (827) $ (537)