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Shareholders' equity - Accumulated other comprehensive income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |
Beginning Balance | $ 2,183,515 | $ 2,162,280 | $ 2,091,777 | $ 2,097,386 | $ 2,162,280 | $ 2,097,386
Current period other comprehensive income (loss) | 13,699 | 9,241 | (3,825) | (12,773) | 22,940 | (16,598)
Ending Balance | 2,208,586 | 2,183,515 | 2,103,018 | 2,091,777 | 2,208,586 | 2,103,018
AOCI |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |
Beginning Balance | (41,369) | (50,610) | (54,714) | (41,941) | (50,610) | (41,941)
Current period other comprehensive income (loss) | 13,699 | 9,241 | (3,825) | (12,773) | 22,940 | (16,598)
Ending Balance | (27,670) | (41,369) | (58,539) | (54,714) | (27,670) | (58,539)
Net unrealized gains (losses) on securities |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |
Beginning Balance |  | (24,423) |  | (14,951) | (24,423) | (14,951)
Current period other comprehensive income (loss) |  |  |  |  | 23,593 | (17,645)
Ending Balance | (830) |  | (32,596) |  | (830) | (32,596)
Unrealized gains (losses) on derivatives |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |
Beginning Balance |  | (436) |  | 0 | (436) | 0
Current period other comprehensive income (loss) |  |  |  |  | (1,063) | 0
Ending Balance | (1,499) |  | 0 |  | (1,499) | 0
Retirement benefit plans |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |
Beginning Balance |  | (25,751) |  | (26,990) | (25,751) | (26,990)
Current period other comprehensive income (loss) |  |  |  |  | 410 | 1,047
Ending Balance | (25,341) |  | (25,943) |  | (25,341) | (25,943)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |
Beginning Balance | 1,964,478 | 1,957,641 | 1,846,955 | 1,845,283 | 1,957,641 | 1,845,283
Current period other comprehensive income (loss) | 23 | 24 | 26 | 31 | 47 | 57
Ending Balance | 1,971,762 | 1,964,478 | 1,852,324 | 1,846,955 | 1,971,762 | 1,852,324
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |
Beginning Balance | 123 | 99 | (1,188) | (1,219) | 99 | (1,219)
Current period other comprehensive income (loss) | 23 | 24 | 26 | 31 |  |
Ending Balance | 146 | 123 | (1,162) | (1,188) | 146 | (1,162)
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |
Beginning Balance |  | $ 99 |  | $ (1,219) | 99 | (1,219)
Current period other comprehensive income (loss) |  |  |  |  | 47 | 57
Ending Balance | $ 146 |  | $ (1,162) |  | $ 146 | $ (1,162)

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