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Bank segment (HEI only) - Statements of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income for common stock | $ 49,573 | $ 65,900 | $ 46,054 | $ 40,247 | $ 32,370 | $ 60,073 | $ 38,661 | $ 34,193 | $ 201,774 | $ 165,297 | $ 248,256
Net unrealized losses on available-for sale investment securities: |  |  |  |  |  |  |  |  |  |  |
Net unrealized losses on available-for sale investment securities arising during the period, net of tax benefits of $3,468, $2,886 and $3,763 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (9,472) | (4,370) | (5,699)
Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil and $238 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 0 | 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 $1,108, $812 and $566 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 21,015 | 15,737 | 14,518
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (8,669) | (1,372) | (6,867)
Comprehensive income attributable to Hawaiian Electric Company, Inc. |  |  |  |  |  |  |  |  | 193,105 | 163,925 | 241,389
American Savings Bank (ASB) |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income for common stock |  |  |  |  |  |  |  |  | 82,509 | 66,997 | 57,279
Net unrealized losses on available-for sale investment securities: |  |  |  |  |  |  |  |  |  |  |
Net unrealized losses on available-for sale investment securities arising during the period, net of tax benefits of $3,468, $2,886 and $3,763 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (9,472) | (4,370) | (5,699)
Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil and $238 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 0 | 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 $1,108, $812 and $566 for 2018, 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 2,353 | 1,231 | 857
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (7,119) | (3,139) | (5,202)
Comprehensive income attributable to Hawaiian Electric Company, Inc. |  |  |  |  |  |  |  |  | $ 75,390 | $ 63,858 | $ 52,077

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