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Shareholders' equity - Reclassification Out Of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 761,650 | $ 768,048 | $ 685,277 | $ 645,874 | $ 658,597 | $ 673,185 | $ 632,281 | $ 591,562 | $ 2,860,849 | $ 2,555,625 | $ 2,380,654
Total reclassifications |  |  |  |  |  |  |  |  | 29,340 | (62,533) | 42,623
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 680,563 | $ 687,409 | $ 608,126 | $ 570,427 | $ 583,311 | $ 598,769 | $ 556,875 | $ 518,611 | 2,546,525 | 2,257,566 |
Total reclassifications |  |  |  |  |  |  |  |  | 27,337 | (63,793) | 41,665
Bank |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 314,275 | 297,640 | 285,924
Electric utility |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,546,525 | 2,257,566 | 2,094,368
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 21,015 | 15,737 | 14,518
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 19,012 | 14,477 | 13,254
Accumulated Defined Benefit Plans Adjustment, Impact Of Decision And Orders Of The Public Utility Commission Included In Regulatory Assets |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 8,325 | (78,724) | 28,584
Accumulated Defined Benefit Plans Adjustment, Impact Of Decision And Orders Of The Public Utility Commission Included In Regulatory Assets | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 8,325 | (78,724) | 28,584
Amount reclassified from AOCI | Net unrealized gains (losses) on securities | Bank |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 360
Amount reclassified from AOCI | Unrealized gains (losses) on derivatives | Window forward contracts | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 0 | 454 | (173)
Amount reclassified from AOCI | Unrealized gains (losses) on derivatives | Interest rate contracts |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 0 | 0 | 54
Amount reclassified from AOCI | Unrealized gains (losses) on derivatives | Electric utility | Window forward contracts |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | $ 0 | $ 454 | $ (173)

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