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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)

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