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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 541,300 | $ 618,605
Revenues | 642,946 | 677,186
Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,378 | 11,556
Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 529,922 | 607,049
Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 181,239 | 190,266
Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 168,465 | 197,105
Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 176,815 | 216,220
Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 2,479 | 3,458
Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,378 | 11,556
Other sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 924 |
Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 101,646 | 58,581
Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 28,429 | (15,304)
Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 58,620 | 64,975
Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,133 | 3,207
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,464 | 5,703
Electric utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 528,998 | 607,049
Revenues | 564,864 | 597,442
Electric utility | Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Electric utility | Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 528,998 | 607,049
Electric utility | Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 181,239 | 190,266
Electric utility | Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 168,465 | 197,105
Electric utility | Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 176,815 | 216,220
Electric utility | Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 2,479 | 3,458
Electric utility | Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Electric utility | Other sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Electric utility | Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 35,866 | (9,607)
Electric utility | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 28,429 | (15,304)
Electric utility | Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Electric utility | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Electric utility | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,437 | 5,697
Bank |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,378 | 11,556
Revenues | 77,131 | 79,738
Bank | Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,378 | 11,556
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 | Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,378 | 11,556
Bank | Other sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 |
Bank | Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 65,753 | 68,182
Bank | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Bank | Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 58,620 | 64,975
Bank | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,133 | 3,207
Bank | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 924 | 0
Revenues | 951 | 6
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 | 924 | 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 | Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Other | Other sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 924 |
Other | Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 27 | 6
Other | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Other | Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Other | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 27 | $ 6

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