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Bank segment - Comprehensive income data (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Condensed Statement of Income Captions [Line Items]        
Net income $ 127,613 $ 51,144 $ 205,039 $ 118,974
Net unrealized gains (losses) on securities:        
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of (taxes) benefits of $1,417, $(2,543), $(5,413) and $(2,382) for the respective periods (2,147) 3,851 8,197 3,608
Less: reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil, $238 and nil for the respective periods 0 0 (360) 0
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $144, $249, $421 and $763 for the respective periods 3,641 5,611 10,877 16,850
Other comprehensive income (loss), net of taxes (1,669) 4,430 9,239 5,361
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 125,473 55,103 212,861 122,918
Net unrealized gains (losses) on securities arising during the period, taxes (1,417) 2,543 5,413 2,382
Reclassification adjustment for net realized gain included in net income, taxes 0 0 238 0
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits (2,324) (3,583) (6,943) (10,760)
American Savings Bank (ASB)        
Condensed Statement of Income Captions [Line Items]        
Net income 15,104 13,451 41,062 39,777
Net unrealized gains (losses) on securities:        
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of (taxes) benefits of $1,417, $(2,543), $(5,413) and $(2,382) for the respective periods (2,147) 3,851 8,197 3,608
Less: reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil, $238 and nil for the respective periods 0 0 (360) 0
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $144, $249, $421 and $763 for the respective periods 219 376 638 1,155
Other comprehensive income (loss), net of taxes (1,928) 4,227 8,475 4,763
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 13,176 17,678 49,537 44,540
Net unrealized gains (losses) on securities arising during the period, taxes 1,417 (2,543) (5,413) (2,382)
Reclassification adjustment for net realized gain included in net income, taxes 0 0 238 0
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits $ 144 $ 249 $ 421 $ 763