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Bank segment - Comprehensive income data (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Condensed Statement of Income Captions [Line Items]        
Net income for common stock $ 38,661 $ 44,128 $ 72,854 $ 76,480
Net unrealized gains (losses) on securities:        
Net unrealized gains on available-for-sale investment securities arising during the period, net of taxes of $1,334, $1,925, $1,482 and $6,830, respectively 2,021 2,916 2,244 10,344
Reclassification adjustment for net realized gains included in net income, net of taxes 0 (360) 0 (360)
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, $140, $537 and $277, respectively 3,930 3,698 7,851 7,236
Other comprehensive income, net of taxes 2,370 2,108 3,355 10,908
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 41,031 46,236 76,209 87,388
Net unrealized gains (losses) on securities arising during the period, taxes (benefits) 1,334 1,925 1,482 6,830
Less: reclassification adjustment to net income - realized gains on available-for-sale investment securities 0 238 0 238
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax benefits (2,508) (2,362) (5,010) (4,619)
American Savings Bank (ASB)        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 16,733 13,285 32,546 25,958
Net unrealized gains (losses) on securities:        
Net unrealized gains on available-for-sale investment securities arising during the period, net of taxes of $1,334, $1,925, $1,482 and $6,830, respectively 2,021 2,915 2,244 10,344
Reclassification adjustment for net realized gains included in net income, net of taxes 0 (360) 0 (360)
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, $140, $537 and $277, respectively 202 211 814 419
Other comprehensive income, net of taxes 2,223 2,766 3,058 10,403
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 18,956 16,051 35,604 36,361
Net unrealized gains (losses) on securities arising during the period, taxes (benefits) 1,334 1,925 1,482 6,830
Less: reclassification adjustment to net income - realized gains on available-for-sale investment securities 0 238 0 238
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax benefits $ (133) $ (140) $ (537) $ (277)