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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)

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