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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Revenues | $ (642,946) | $ (677,186)
Total reclassifications | (188) | 548
Bank |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Revenues | (77,131) | (79,738)
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Revenues | (564,864) | (597,442)
Total reclassifications | 34 | 26
Net realized gains on securities included in net income | Reclassification out of Accumulated Other Comprehensive Income | Bank |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Revenues | (387) | 0
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | 6,010 | 5,706
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | 5,845 | 5,184
Impact of D&Os of the PUC included in regulatory assets |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | (5,811) | (5,158)
Impact of D&Os of the PUC included in regulatory assets | Hawaiian Electric Company, Inc. and Subsidiaries |  |
Reclassifications out of accumulated other comprehensive income/(loss) |  |
Total reclassifications | $ (5,811) | $ (5,158)

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