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Bank segment - Comprehensive income data (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income for common stock | $ 65,900 | $ 60,073 | $ 152,201 | $ 132,927
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 $1,876, $(137), $8,335 and $(1,619), respectively | (5,123) | 208 | (22,768) | 2,452
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 $141, $138, $968 and $675, respectively | 5,259 | 3,942 | 15,755 | 11,793
Other comprehensive income (loss), net of taxes | (4,589) | 554 | (21,187) | 3,909
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 61,311 | 60,627 | 131,014 | 136,836
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits | 1,876 | (137) | 8,335 | (1,619)
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) | (1,832) | (2,516) | (5,486) | (7,526)
American Savings Bank (ASB) |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income for common stock | 21,221 | 17,592 | 60,742 | 50,138
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 $1,876, $(137), $8,335 and $(1,619), respectively | (5,123) | 208 | (22,768) | 2,452
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 $141, $138, $968 and $675, respectively | 382 | 209 | 1,970 | 1,023
Other comprehensive income (loss), net of taxes | (4,741) | 417 | (20,798) | 3,475
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 16,480 | 18,009 | 39,944 | 53,613
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits | 1,876 | (137) | 8,335 | (1,619)
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) | $ (141) | $ (138) | $ (968) | $ (675)

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