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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |
Beginning Balance | $ 2,291,398 |  | $ 2,280,260 | $ 2,208,586 | $ 2,183,515 | $ 2,162,280 | $ 2,280,260 | $ 2,162,280
Net income for common stock | 65,032 | $ 48,887 | 33,420 | 63,419 | 42,512 | 45,688 | 147,339 | 151,619
Other comprehensive income, net of taxes | 1,440 | (332) | 18,212 | 3,297 | 13,699 | 9,241 | 19,320 | 26,237
Common stock dividends | (36,030) | (36,017) | (36,019) | (34,871) | (34,860) | (34,860) |  |
Ending Balance | 2,323,231 | 2,291,398 |  | 2,242,689 | 2,208,586 | 2,183,515 | 2,323,231 | 2,242,689
Consolidating adjustments |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |
Beginning Balance |  |  | (591,969) |  |  | (576,838) | (591,969) | (576,838)
Net income for common stock | (14,912) |  |  | (11,048) |  |  | (37,492) | (30,983)
Other comprehensive income, net of taxes | (1) |  |  | 0 |  |  | (2) | (2)
Common stock dividends |  |  |  |  |  |  | 23,028 | 18,936
Dissolution of subsidiary |  |  |  |  |  |  | 24 |
Common stock issuance expenses |  |  |  |  |  |  |  | 1
Ending Balance | (606,411) |  |  | (588,886) |  |  | (606,411) | (588,886)
Hawaiian Electric (parent only) | Reportable Legal Entities |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |
Beginning Balance |  |  | 2,047,352 |  |  | 1,957,641 | 2,047,352 | 1,957,641
Net income for common stock | 60,065 |  |  | 46,779 |  |  | 126,299 | 111,479
Other comprehensive income, net of taxes | 48 |  |  | 26 |  |  | 99 | 73
Common stock dividends |  |  |  |  |  |  | (80,352) | (75,939)
Ending Balance | 2,093,398 |  |  | 1,993,254 |  |  | 2,093,398 | 1,993,254
HELCO | Reportable Legal Entities |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |
Beginning Balance |  |  | 298,998 |  |  | 295,874 | 298,998 | 295,874
Net income for common stock | 8,060 |  |  | 5,269 |  |  | 21,306 | 15,104
Other comprehensive income, net of taxes | (2) |  |  | 0 |  |  | 2 | 2
Common stock dividends |  |  |  |  |  |  | (12,240) | (7,635)
Ending Balance | 308,066 |  |  | 303,345 |  |  | 308,066 | 303,345
Maui Electric | Reportable Legal Entities |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |
Beginning Balance |  |  | 292,870 |  |  | 280,863 | 292,870 | 280,863
Net income for common stock | 6,852 |  |  | 5,779 |  |  | 16,186 | 15,879
Other comprehensive income, net of taxes | 3 |  |  | 0 |  |  | 0 | 0
Common stock dividends |  |  |  |  |  |  | (10,788) | (11,301)
Common stock issuance expenses |  |  |  |  |  |  |  | (1)
Ending Balance | 298,268 |  |  | 285,440 |  |  | 298,268 | 285,440
Other subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |
Beginning Balance |  |  | 101 |  |  | 101 | 101 | 101
Net income for common stock | 0 |  |  | 0 |  |  | 0 | 0
Other comprehensive income, net of taxes | 0 |  |  | 0 |  |  | 0 | 0
Dissolution of subsidiary |  |  |  |  |  |  | (24) |
Ending Balance | 77 |  |  | 101 |  |  | 77 | 101
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |
Beginning Balance | 2,060,069 | 2,044,499 | 2,047,352 | 1,971,762 | 1,964,478 | 1,957,641 | 2,047,352 | 1,957,641
Net income for common stock | 60,065 | 42,329 | 23,905 | 46,779 | 32,574 | 32,126 | 126,299 | 111,479
Other comprehensive income, net of taxes | 48 | 25 | 26 | 26 | 23 | 24 | 99 | 73
Common stock dividends | (26,784) | (26,784) | (26,784) | (25,313) | (25,313) | (25,313) | (80,352) | (75,939)
Dissolution of subsidiary |  |  |  |  |  |  | 0 |
Common stock issuance expenses |  |  |  |  |  |  |  | 0
Ending Balance | $ 2,093,398 | $ 2,060,069 | $ 2,044,499 | $ 1,993,254 | $ 1,971,762 | $ 1,964,478 | $ 2,093,398 | $ 1,993,254

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