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Shareholders' equity - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Gain on sale of investment securities, net | $ (528) | $ (9,275) | $ (653)
Interest expense | 94,363 | 88,694 | 90,899
Net income (loss) | (248,056) | (199,714) | (219,772)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income (loss) | (179,637) | (171,335) | (158,835)
Amount reclassified from AOCI |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income (loss) | (152,442) | 61,911 | (6,548)
Amount reclassified from AOCI | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income (loss) | (151,884) | 61,410 | (6,627)
Amount reclassified from AOCI | Net unrealized gains (losses) on securities |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Gain on sale of investment securities, net | (387) | (1,638) | (478)
Amount reclassified from AOCI | Net realized losses on derivatives qualifying as cash flow hedges |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | 37 | 0 | 0
Amount reclassified from AOCI | Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income (loss) | 19,253 | 23,689 | 10,107
Amount reclassified from AOCI | Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income (loss) | 19,461 | 21,550 | 9,550
Amount reclassified from AOCI | Impact of D&Os of the PUC included in regulatory assets |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income (loss) | (171,345) | 39,860 | (16,177)
Amount reclassified from AOCI | Impact of D&Os of the PUC included in regulatory assets | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income (loss) | $ (171,345) | $ 39,860 | $ (16,177)

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