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Revenues (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2018 |  | Nine months ended September 30, 2018
|  | Electric utility |  | Bank |  | Other |  | Total |  | Electric utility |  | Bank |  | Other |  | Total
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric energy sales - residential |  | $ | 222,196 |  |  | $ | — |  |  | $ | — |  |  | $ | 222,196 |  |  | $ | 586,002 |  |  | $ | — |  |  | $ | — |  |  | $ | 586,002 |
Electric energy sales - commercial |  | 229,476 |  |  | — |  |  | — |  |  | 229,476 |  |  | 624,643 |  |  | — |  |  | — |  |  | 624,643 |
Electric energy sales - large light and power |  | 242,457 |  |  | — |  |  | — |  |  | 242,457 |  |  | 649,454 |  |  | — |  |  | — |  |  | 649,454 |
Electric energy sales - other |  | 3,464 |  |  | — |  |  | — |  |  | 3,464 |  |  | 9,944 |  |  | — |  |  | — |  |  | 9,944 |
Utility fees |  | 832 |  |  | — |  |  | — |  |  | 832 |  |  | 2,380 |  |  | — |  |  | — |  |  | 2,380 |
Bank fees |  | — |  |  | 11,743 |  |  | — |  |  | 11,743 |  |  | — |  |  | 34,797 |  |  | — |  |  | 34,797 |
Total revenues from contracts with customers |  | 698,425 |  |  | 11,743 |  |  | — |  |  | 710,168 |  |  | 1,872,423 |  |  | 34,797 |  |  | — |  |  | 1,907,220 |
Revenues from other sources |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory revenue |  | (13,572 | ) |  | — |  |  | — |  |  | (13,572 | ) |  | (13,465 | ) |  | — |  |  | — |  |  | (13,465 | )
Bank interest and dividend income |  | — |  |  | 65,185 |  |  | — |  |  | 65,185 |  |  | — |  |  | 190,448 |  |  | — |  |  | 190,448 |
Other bank noninterest income |  | — |  |  | 3,568 |  |  | — |  |  | 3,568 |  |  | — |  |  | 7,774 |  |  | — |  |  | 7,774 |
Other |  | 2,556 |  |  | — |  |  | 143 |  |  | 2,699 |  |  | 7,004 |  |  | — |  |  | 218 |  |  | 7,222 |
Total revenues from other sources |  | (11,016 | ) |  | 68,753 |  |  | 143 |  |  | 57,880 |  |  | (6,461 | ) |  | 198,222 |  |  | 218 |  |  | 191,979 |
Total revenues |  | $ | 687,409 |  |  | $ | 80,496 |  |  | $ | 143 |  |  | $ | 768,048 |  |  | $ | 1,865,962 |  |  | $ | 233,019 |  |  | $ | 218 |  |  | $ | 2,099,199 |
Timing of revenue recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Services/goods transferred at a point in time |  | $ | 832 |  |  | $ | 11,743 |  |  | $ | — |  |  | $ | 12,575 |  |  | $ | 2,380 |  |  | $ | 34,797 |  |  | $ | — |  |  | $ | 37,177 |
Services/goods transferred over time |  | 697,593 |  |  | — |  |  | — |  |  | 697,593 |  |  | 1,870,043 |  |  | — |  |  | — |  |  | 1,870,043 |
Total revenues from contracts with customers |  | $ | 698,425 |  |  | $ | 11,743 |  |  | $ | — |  |  | $ | 710,168 |  |  | $ | 1,872,423 |  |  | $ | 34,797 |  |  | $ | — |  |  | $ | 1,907,220 |

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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