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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenue from Contract with Customer [Abstract] |  |
General payment period | 30 days |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 575,465 |
Other revenues | 70,409 |
Total revenues | 645,874 | $ 591,562
Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 12,294 |
Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 563,171 |
Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 178,589 |
Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 188,998 |
Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 192,321 |
Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 3,263 |
Utility fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 797 |
Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,497 |
Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 4,750 |
Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 62,002 |
Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 1,920 |
Other |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 1,737 |
Electric utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 563,968 |
Other revenues | 6,459 |
Total revenues | 570,427 | 518,611
Electric utility | Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 797 |
Electric utility | Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 563,171 |
Electric utility | Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 178,589 |
Electric utility | Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 188,998 |
Electric utility | Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 192,321 |
Electric utility | Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 3,263 |
Electric utility | Utility fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 797 |
Electric utility | Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Electric utility | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 4,750 |
Electric utility | Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 0 |
Electric utility | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 0 |
Electric utility | Other |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 1,709 |
Bank |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,497 |
Other revenues | 63,922 |
Total revenues | 75,419 | 72,856
Bank | Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,497 |
Bank | Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Bank | Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Bank | Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Bank | Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Bank | Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Bank | Utility fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Bank | Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,497 |
Bank | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 0 |
Bank | Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 62,002 |
Bank | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 1,920 |
Bank | Other |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 0 |
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Other revenues | 28 |
Total revenues | 28 | $ 95
Other | Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Other | Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Other | Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Other | Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Other | Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Other | Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Other | Utility fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Other | Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Other | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 0 |
Other | Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 0 |
Other | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | 0 |
Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Other revenues | $ 28 |

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