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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 618,605 | $ 577,390
Total revenues | 677,186 | 661,615
Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,556 | 11,233
Services/goods transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 607,049 | 566,157
Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 190,266 | 175,745
Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 197,105 | 187,408
Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 216,220 | 198,926
Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 3,458 | 4,078
Bank fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,556 | 11,233
Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 58,581 | 84,225
Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | (15,304) | 6,207
Bank interest and dividend income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 64,975 | 68,488
Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 3,207 | 3,331
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 5,703 | 6,199
Electric utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 607,049 | 566,157
Total revenues | 597,442 | 578,495
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 | 607,049 | 566,157
Electric utility | Electric energy sales - residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 190,266 | 175,745
Electric utility | Electric energy sales - commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 197,105 | 187,408
Electric utility | Electric energy sales - large light and power |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 216,220 | 198,926
Electric utility | Electric energy sales - other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 3,458 | 4,078
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 | (9,607) | 12,338
Electric utility | Regulatory revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | (15,304) | 6,207
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 | 5,697 | 6,131
Bank |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,556 | 11,233
Total revenues | 79,738 | 83,052
Bank | Services/goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,556 | 11,233
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 | 11,556 | 11,233
Bank | Revenues from Other Sources |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 68,182 | 71,819
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 | 64,975 | 68,488
Bank | Other bank noninterest income |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 3,207 | 3,331
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 | 6 | 68
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 | 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 | 6 | 68
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 | $ 6 | $ 68

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