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Bank segment - Comprehensive income data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Condensed Statement of Income Captions [Line Items]    
Net income for common stock $ 34,193 $ 32,352
Net unrealized gains (losses) on securities:    
Net unrealized gains on available-for-sale investment securities arising during the period, net of taxes of $148 and $4,905, respectively 223 7,428
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 $404 and $137, respectively 3,921 3,538
Other comprehensive income, net of taxes 985 8,800
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 35,178 41,152
Net unrealized gains (losses) on securities arising during the period, taxes (benefits) 148 4,905
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 2,502 2,257
American Savings Bank (ASB)    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 15,813 12,673
Net unrealized gains (losses) on securities:    
Net unrealized gains on available-for-sale investment securities arising during the period, net of taxes of $148 and $4,905, respectively 223 7,429
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 $404 and $137, respectively 612 208
Other comprehensive income, net of taxes 835 7,637
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 16,648 20,310
Net unrealized gains (losses) on securities arising during the period, taxes (benefits) 148 4,905
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits $ 404 $ 137