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Shareholders' equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 1,534,432 | $ 1,505,876 | $ 1,479,089 | $ 1,085,273 | $ 2,377,380 | $ 2,344,841 | $ 1,479,089 | $ 2,344,841
Current period other comprehensive income (loss) | (734) | (306) | (460) | 39,360 | 1,594 | (9,801) | (1,500) | 31,153
Ending balance | 1,563,836 | 1,534,432 | 1,505,876 | 1,577,041 | 1,085,273 | 2,377,380 | 1,563,836 | 1,577,041
AOCI |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 2,695 | 3,001 | 3,461 | (297,557) | (299,151) | (289,350) | 3,461 | (289,350)
Current period other comprehensive income (loss) | (734) | (306) | (460) | 39,360 | 1,594 | (9,801) |  |
Ending balance | 1,961 | 2,695 | 3,001 | (258,197) | (297,557) | (299,151) | 1,961 | (258,197)
Net unrealized gains (losses) on securities |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 0 |  |  | (282,963) | 0 | (282,963)
Current period other comprehensive income (loss) |  |  |  |  |  |  | 0 | 31,260
Ending balance | 0 |  |  | (251,703) |  |  | 0 | (251,703)
Unrealized gains (losses) on derivatives |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 2,120 |  |  | 1,638 | 2,120 | 1,638
Current period other comprehensive income (loss) |  |  |  |  |  |  | (1,466) | (220)
Ending balance | 654 |  |  | 1,418 |  |  | 654 | 1,418
Retirement benefit plans |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | 1,341 |  |  | (8,025) | 1,341 | (8,025)
Current period other comprehensive income (loss) |  |  |  |  |  |  | (34) | 113
Ending balance | 1,307 |  |  | (7,912) |  |  | 1,307 | (7,912)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 1,521,617 | 1,492,244 | 1,156,955 | 1,192,842 | 2,435,282 | 2,409,110 | 1,156,955 | 2,409,110
Current period other comprehensive income (loss) | (24) | (47) | (47) | 2 | (46) | (49) | (118) | (93)
Ending balance | 1,548,581 | 1,521,617 | 1,492,244 | 1,110,259 | 1,192,842 | 2,435,282 | 1,548,581 | 1,110,259
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 2,692 | 2,739 | 2,786 | 2,754 | 2,800 | 2,849 | 2,786 | 2,849
Current period other comprehensive income (loss) | (24) | (47) | (47) | 2 | (46) | (49) |  |
Ending balance | 2,668 | $ 2,692 | 2,739 | 2,756 | $ 2,754 | 2,800 | 2,668 | 2,756
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 2,786 |  |  | $ 2,849 | 2,786 | 2,849
Current period other comprehensive income (loss) |  |  |  |  |  |  | (118) | (93)
Ending balance | $ 2,668 |  |  | $ 2,756 |  |  | $ 2,668 | $ 2,756

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