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Shareholders' equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 2,344,841 | $ 2,202,499
Current period other comprehensive income (loss) | (9,801) | 20,488
Ending balance | 2,377,380 | 2,237,955
AOCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (289,350) | (336,028)
Current period other comprehensive income (loss) | (9,801) | 20,488
Ending balance | (299,151) | (315,540)
Net unrealized gains (losses) on securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (282,963) | (328,904)
Current period other comprehensive income (loss) | (10,503) | 20,282
Ending balance | (293,466) | (308,622)
Unrealized gains (losses) on derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 1,638 | 1,991
Current period other comprehensive income (loss) | 692 | 138
Ending balance | 2,330 | 2,129
Retirement benefit plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (8,025) | (9,115)
Current period other comprehensive income (loss) | 10 | 68
Ending balance | (8,015) | (9,047)
Hawaiian Electric Company, Inc. and Subsidiaries |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 2,409,110 | 2,344,170
Current period other comprehensive income (loss) | (49) | (45)
Ending balance | 2,435,282 | 2,358,884
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 2,849 | 2,861
Current period other comprehensive income (loss) | (49) | (45)
Ending balance | 2,800 | 2,816
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 2,849 | 2,861
Current period other comprehensive income (loss) | (49) | (45)
Ending balance | $ 2,800 | $ 2,816

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