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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |  |
General payment period |  | 30 days
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 710,168 | $ 1,907,220
Total revenues | 768,048 | 2,099,199
Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 12,575 | 37,177
Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 697,593 | 1,870,043
Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 222,196 | 586,002
Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 229,476 | 624,643
Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 242,457 | 649,454
Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 3,464 | 9,944
Utility fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 832 | 2,380
Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,743 | 34,797
Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 57,880 | 191,979
Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | (13,572) | (13,465)
Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 65,185 | 190,448
Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 3,568 | 7,774
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2,699 | 7,222
Electric utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 698,425 | 1,872,423
Total revenues | 687,409 | 1,865,962
Electric utility | Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 832 | 2,380
Electric utility | Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 697,593 | 1,870,043
Electric utility | Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 222,196 | 586,002
Electric utility | Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 229,476 | 624,643
Electric utility | Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 242,457 | 649,454
Electric utility | Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 3,464 | 9,944
Electric utility | Utility fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 832 | 2,380
Electric utility | Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Electric utility | Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | (11,016) | (6,461)
Electric utility | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | (13,572) | (13,465)
Electric utility | Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Electric utility | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Electric utility | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2,556 | 7,004
Bank |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,743 | 34,797
Total revenues | 80,496 | 233,019
Bank | Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,743 | 34,797
Bank | Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Bank | Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Bank | Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Bank | Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Bank | Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Bank | Utility fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Bank | Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,743 | 34,797
Bank | Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 68,753 | 198,222
Bank | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Bank | Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 65,185 | 190,448
Bank | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 3,568 | 7,774
Bank | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Total revenues | 143 | 218
Other | Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Other | Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Other | Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Other | Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Other | Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Other | Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Other | Utility fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Other | Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Other | Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 143 | 218
Other | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Other | Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Other | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 143 | $ 218

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