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Segment financial information (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 02, 2018 MWh project MW | Nov. 24, 2017 MW | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) MW | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 2,614,831 |  | $ 2,380,654
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
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 255,629 | 221,998 | 204,746
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 104,216 | 91,128 | 88,558
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | 254,461 | 276,580 | 373,841
Income taxes (benefit) |  |  |  |  |  |  |  |  |  |  | 50,797 | 109,393 | 123,695
Net income (loss) |  |  | 50,046 | 66,371 | 46,527 | 40,720 | 32,843 | 60,544 | 39,134 | 34,666 | 203,664 | 167,187 | 250,146
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  |  |  | 1,890 | 1,890 | 1,890
Net income for common stock |  |  | 49,573 | $ 65,900 | $ 46,054 | $ 40,247 | 32,370 | $ 60,073 | $ 38,661 | $ 34,193 | 201,774 | 165,297 | 248,256
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 537,369 | 495,187 | 330,043
Assets |  |  | 13,104,051 |  |  |  | 12,534,160 |  |  |  | 13,104,051 | 12,534,160 | 11,881,981
Electric utility |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 2,567,531 |  | 2,094,368
Revenues |  |  |  |  |  |  |  |  |  |  | 2,546,525 | 2,257,566 | 2,094,368
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 230,228 | 201,282 | 193,996
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 73,348 | 69,637 | 66,824
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | 180,426 | 205,145 | 229,113
Income taxes (benefit) |  |  |  |  |  |  |  |  |  |  | 34,778 | 83,199 | 84,801
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 145,648 | 121,946 | 144,312
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  |  |  | 1,995 | 1,995 | 1,995
Net income for common stock |  |  |  |  |  |  |  |  |  |  | 143,653 | 119,951 | 142,317
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 445,863 | 441,598 | 320,437
Assets |  |  | 5,967,503 |  |  |  | 5,630,613 |  |  |  | 5,967,503 | 5,630,613 | 5,431,903
Bank |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 47,300 |  | 285,924
Revenues |  |  |  |  |  |  |  |  |  |  | 314,275 | 297,640 | 285,924
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 21,443 | 19,416 | 9,813
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 15,539 | 12,156 | 12,755
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | 106,578 | 98,716 | 87,352
Income taxes (benefit) |  |  |  |  |  |  |  |  |  |  | 24,069 | 31,719 | 30,073
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 82,509 | 66,997 | 57,279
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income for common stock |  |  |  |  |  |  |  |  |  |  | 82,509 | 66,997 | 57,279
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 72,666 | 53,272 | 9,394
Assets |  |  | 7,027,894 |  |  |  | 6,798,659 |  |  |  | 7,027,894 | 6,798,659 | 6,421,357
Other |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 0 |  | 362
Revenues |  |  |  |  |  |  |  |  |  |  | 49 | 419 | 362
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 3,958 | 1,300 | 937
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 15,329 | 9,335 | 8,979
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | (32,543) | (27,281) | 57,376
Income taxes (benefit) |  |  |  |  |  |  |  |  |  |  | (8,050) | (5,525) | 8,821
Net income (loss) |  |  |  |  |  |  |  |  |  |  | (24,493) | (21,756) | 48,555
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  |  |  | (105) | (105) | (105)
Net income for common stock |  |  |  |  |  |  |  |  |  |  | (24,388) | (21,651) | 48,660
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 18,840 | 317 | 212
Assets |  |  | $ 108,654 |  |  |  | $ 104,888 |  |  |  | 108,654 | 104,888 | 28,721
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 2,860,849 | 2,555,625 | 2,380,654
Operating Segments | Electric utility |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 2,546,472 | 2,257,455 | 2,094,224
Operating Segments | Bank |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 314,275 | 297,640 | 285,924
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 102 | 530 | 506
Intersegment eliminations |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment eliminations | Electric utility |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 53 | 111 | 144
Intersegment eliminations | Bank |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment eliminations | Other |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ (53) | $ (111) | $ (144)
Hamakua Energy Partners, L.P. (HEP) |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Power produced by power plants (in megawatts) | MW |  | 60 |  |  |  |  |  |  |  |  | 60 |  |
Mauo, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Segment financial information |  |  |  |  |  |  |  |  |  |  |  |  |
Power produced by power plants (in megawatts) | MW | 8.6 |  |  |  |  |  |  |  |  |  |  |  |
Power storage capacity (in megawatt hours) | MWh | 42.3 |  |  |  |  |  |  |  |  |  |  |  |
Power purchase agreement term | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Power purchase agreement extension term | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Number of project sites expected to be placed in service during 2019 and 2020 | project | 5 |  |  |  |  |  |  |  |  |  |  |  |

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