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Shareholders' equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 1,085,273 | $ 2,377,380 | $ 2,344,841 | $ 2,249,377 | $ 2,237,955 | $ 2,202,499 | $ 2,344,841 | $ 2,202,499
Current period other comprehensive income (loss) | 39,360 | 1,594 | (9,801) | (34,875) | (7,609) | 20,488 | 31,153 | (21,996)
Ending balance | 1,577,041 | 1,085,273 | 2,377,380 | 2,224,354 | 2,249,377 | 2,237,955 | 1,577,041 | 2,224,354
AOCI |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (297,557) | (299,151) | (289,350) | (323,149) | (315,540) | (336,028) | (289,350) | (336,028)
Current period other comprehensive income (loss) | 39,360 | 1,594 | (9,801) | (34,875) | (7,609) | 20,488 |  |
Ending balance | (258,197) | (297,557) | (299,151) | (358,024) | (323,149) | (315,540) | (258,197) | (358,024)
Net unrealized gains (losses) on securities |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | (282,963) |  |  | (328,904) | (282,963) | (328,904)
Current period other comprehensive income (loss) |  |  |  |  |  |  | 31,260 | (21,330)
Ending balance | (251,703) |  |  | (350,234) |  |  | (251,703) | (350,234)
Unrealized gains (losses) on derivatives |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 1,638 |  |  | 1,991 | 1,638 | 1,991
Current period other comprehensive income (loss) |  |  |  |  |  |  | (220) | (827)
Ending balance | 1,418 |  |  | 1,164 |  |  | 1,418 | 1,164
Retirement benefit plans |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | (8,025) |  |  | (9,115) | (8,025) | (9,115)
Current period other comprehensive income (loss) |  |  |  |  |  |  | 113 | 161
Ending balance | (7,912) |  |  | (8,954) |  |  | (7,912) | (8,954)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 1,192,842 | 2,435,282 | 2,409,110 | 2,371,889 | 2,358,884 | 2,344,170 | 2,409,110 | 2,344,170
Current period other comprehensive income (loss) | 2 | (46) | (49) | (77) | (44) | (45) | (93) | (166)
Ending balance | 1,110,259 | 1,192,842 | 2,435,282 | 2,383,023 | 2,371,889 | 2,358,884 | 1,110,259 | 2,383,023
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 2,754 | 2,800 | 2,849 | 2,772 | 2,816 | 2,861 | 2,849 | 2,861
Current period other comprehensive income (loss) | 2 | (46) | (49) | (77) | (44) | (45) |  |
Ending balance | 2,756 | $ 2,754 | 2,800 | 2,695 | $ 2,772 | 2,816 | 2,756 | 2,695
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 2,849 |  |  | $ 2,861 | 2,849 | 2,861
Current period other comprehensive income (loss) |  |  |  |  |  |  | (93) | (166)
Ending balance | $ 2,756 |  |  | $ 2,695 |  |  | $ 2,756 | $ 2,695

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