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Bank segment - Comprehensive income data (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | $ 45,688 | $ 40,247
Net unrealized gains (losses) on available-for-sale investment securities: |  |
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of (taxes) benefits of $(3,455) and $4,867, respectively | 9,439 | (13,297)
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of (taxes) benefits of $(1,166) and $694, respectively | 2,503 | 5,146
Other comprehensive income (loss), net of taxes | 9,241 | (12,773)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 54,929 | 27,474
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits | (3,455) | 4,867
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) | 870 | 1,792
American Savings Bank (ASB) |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 20,839 | 18,960
Net unrealized gains (losses) on available-for-sale investment securities: |  |
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of (taxes) benefits of $(3,455) and $4,867, respectively | 9,439 | (13,297)
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of (taxes) benefits of $(1,166) and $694, respectively | (3,187) | 1,222
Other comprehensive income (loss), net of taxes | 6,252 | (12,075)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 27,091 | 6,885
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits | (3,455) | 4,867
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, taxes (benefits) | $ (1,166) | $ 694

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