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Revenues (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following tables disaggregates revenues by major source, timing of revenue recognition, and segment:
Three months ended March 31, 2018 |  | Electric utility |  | Bank |  | Other |  | Total
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |
Electric energy sales - residential |  | $ | 178,589 |  |  | $ | — |  |  | $ | — |  |  | $ | 178,589 |
Electric energy sales - commercial |  | 188,998 |  |  | — |  |  | — |  |  | 188,998 |
Electric energy sales - large light and power |  | 192,321 |  |  | — |  |  | — |  |  | 192,321 |
Electric energy sales - other |  | 3,263 |  |  | — |  |  | — |  |  | 3,263 |
Utility fees |  | 797 |  |  | — |  |  | — |  |  | 797 |
Bank fees |  | — |  |  | 11,497 |  |  | — |  |  | 11,497 |
Total revenues from contracts with customers |  | 563,968 |  |  | 11,497 |  |  | — |  |  | 575,465 |
Revenues from other sources |  |  |  |  |  |  |  |
Regulatory revenue |  | 4,750 |  |  | — |  |  | — |  |  | 4,750 |
Bank interest and dividend income |  | — |  |  | 62,002 |  |  | — |  |  | 62,002 |
Other bank noninterest income |  | — |  |  | 1,920 |  |  | — |  |  | 1,920 |
Other |  | 1,709 |  |  | — |  |  | 28 |  |  | 1,737 |
Total revenues from other sources |  | 6,459 |  |  | 63,922 |  |  | 28 |  |  | 70,409 |
Total revenues |  | $ | 570,427 |  |  | $ | 75,419 |  |  | $ | 28 |  |  | $ | 645,874 |
Timing of revenue recognition |  |  |  |  |  |  |  |
Services/goods transferred at a point in time |  | $ | 797 |  |  | $ | 11,497 |  |  | $ | — |  |  | $ | 12,294 |
Services/goods transferred over time |  | 563,171 |  |  | — |  |  | — |  |  | 563,171 |
Total revenues from contracts with customers |  | $ | 563,968 |  |  | $ | 11,497 |  |  | $ | — |  |  | $ | 575,465 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References No definition available. + Details
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- Definition Revenue from Contract with Customer [Abstract] + References No definition available. + Details
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