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Revenues (Tables) | 6 Months Ended
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Jun. 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 June 30, 2018 |  | Six months ended June 30, 2018
|  | Electric utility |  | Bank |  | Other |  | Total |  | Electric utility |  | Bank |  | Other |  | Total
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric energy sales - residential |  | $ | 185,217 |  |  | $ | — |  |  | $ | — |  |  | $ | 185,217 |  |  | $ | 363,806 |  |  | $ | — |  |  | $ | — |  |  | $ | 363,806 |
Electric energy sales - commercial |  | 206,169 |  |  | — |  |  | — |  |  | 206,169 |  |  | 395,167 |  |  | — |  |  | — |  |  | 395,167 |
Electric energy sales - large light and power |  | 214,676 |  |  | — |  |  | — |  |  | 214,676 |  |  | 406,997 |  |  | — |  |  | — |  |  | 406,997 |
Electric energy sales - other |  | 3,217 |  |  | — |  |  | — |  |  | 3,217 |  |  | 6,480 |  |  | — |  |  | — |  |  | 6,480 |
Utility fees |  | 751 |  |  | — |  |  | — |  |  | 751 |  |  | 1,548 |  |  | — |  |  | — |  |  | 1,548 |
Bank fees |  | — |  |  | 11,557 |  |  | — |  |  | 11,557 |  |  | — |  |  | 23,054 |  |  | — |  |  | 23,054 |
Total revenues from contracts with customers |  | 610,030 |  |  | 11,557 |  |  | — |  |  | 621,587 |  |  | 1,173,998 |  |  | 23,054 |  |  | — |  |  | 1,197,052 |
Revenues from other sources |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory revenue |  | (4,643 | ) |  | — |  |  | — |  |  | (4,643 | ) |  | 107 |  |  | — |  |  | — |  |  | 107 |
Bank interest and dividend income |  | — |  |  | 63,261 |  |  | — |  |  | 63,261 |  |  | — |  |  | 125,263 |  |  | — |  |  | 125,263 |
Other bank noninterest income |  | — |  |  | 2,286 |  |  | — |  |  | 2,286 |  |  | — |  |  | 4,206 |  |  | — |  |  | 4,206 |
Other |  | 2,739 |  |  | — |  |  | 47 |  |  | 2,786 |  |  | 4,448 |  |  | — |  |  | 75 |  |  | 4,523 |
Total revenues from other sources |  | (1,904 | ) |  | 65,547 |  |  | 47 |  |  | 63,690 |  |  | 4,555 |  |  | 129,469 |  |  | 75 |  |  | 134,099 |
Total revenues |  | $ | 608,126 |  |  | $ | 77,104 |  |  | $ | 47 |  |  | $ | 685,277 |  |  | $ | 1,178,553 |  |  | $ | 152,523 |  |  | $ | 75 |  |  | $ | 1,331,151 |
Timing of revenue recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Services/goods transferred at a point in time |  | $ | 751 |  |  | $ | 11,557 |  |  | $ | — |  |  | $ | 12,308 |  |  | $ | 1,548 |  |  | $ | 23,054 |  |  | $ | — |  |  | $ | 24,602 |
Services/goods transferred over time |  | 609,279 |  |  | — |  |  | — |  |  | 609,279 |  |  | 1,172,450 |  |  | — |  |  | — |  |  | 1,172,450 |
Total revenues from contracts with customers |  | $ | 610,030 |  |  | $ | 11,557 |  |  | $ | — |  |  | $ | 621,587 |  |  | $ | 1,173,998 |  |  | $ | 23,054 |  |  | $ | — |  |  | $ | 1,197,052 |

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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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