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Bank segment - Comprehensive income data (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | $ 40,247 | $ 34,193
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 $4,867 and $(148), respectively | (13,297) | 223
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 $694 and $404, respectively | 5,146 | 3,921
Other comprehensive income (loss), net of taxes | (12,773) | 985
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 27,474 | 35,178
Net unrealized gains (losses) on securities arising during the period, taxes (benefits) | (4,867) | 148
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) | (1,792) | (2,502)
American Savings Bank (ASB) |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 18,960 | 15,813
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 $4,867 and $(148), respectively | (13,297) | 223
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 $694 and $404, respectively | 1,222 | 612
Other comprehensive income (loss), net of taxes | (12,075) | 835
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 6,885 | 16,648
Net unrealized gains (losses) on securities arising during the period, taxes (benefits) | (4,867) | 148
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) | $ (694) | $ (404)

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