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Shareholders' equity - Reclassification Out Of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Revenues $ 658,597 $ 673,185 $ 632,281 $ 591,562 $ 617,395 $ 646,055 $ 566,244 $ 550,960 $ 2,555,625 $ 2,380,654 $ 2,602,982
Total reclassifications                 (62,533) 42,623 (2,439)
Hawaiian Electric Company, Inc. and Subsidiaries                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Revenues $ 583,311 $ 598,769 $ 556,875 $ 518,611 $ 544,668 $ 572,253 $ 495,395 $ 482,052 2,257,566 2,094,368 2,335,166
Total reclassifications                 (63,793) 41,665 (4,758)
Bank                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Revenues                 297,640 285,924 267,733
Electric utility                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Revenues                 2,257,566 2,094,368 2,335,166
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Total reclassifications                 15,737 14,518 22,465
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                 14,477 13,254 20,381
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                 (78,724) 28,584 (25,139)
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                 (78,724) 28,584 (25,139)
Amount reclassified from AOCI | Net unrealized gains (losses) on securities | Bank                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Revenues                 0 360 0
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                 454 (173) 0
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 54 235
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                 $ 454 $ (173) $ 0