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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 532,921 | $ 660,421 | $ 1,151,526 | $ 1,237,811
Total revenues | 608,945 | 715,485 | 1,286,131 | 1,377,100
Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 7,211 | 11,632 | 18,767 | 22,865
Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 525,710 | 648,789 | 1,132,759 | 1,214,946
Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 187,590 | 195,868 | 377,856 | 371,613
Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 159,874 | 217,278 | 356,979 | 404,686
Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 176,467 | 231,869 | 392,687 | 430,795
Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,779 | 3,774 | 5,237 | 7,852
Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 7,211 | 11,632 | 18,767 | 22,865
Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 76,024 | 55,064 | 134,605 | 139,289
Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,826 | (20,360) | (12,478) | (14,153)
Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 59,829 | 66,155 | 124,804 | 134,643
Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,674 | 3,900 | 10,881 | 7,231
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,695 | 5,369 | 11,398 | 11,568
Electric utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 525,710 | 648,789 | 1,132,759 | 1,214,946
Total revenues | 534,215 | 633,784 | 1,131,657 | 1,212,279
Electric utility | Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Electric utility | Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 525,710 | 648,789 | 1,132,759 | 1,214,946
Electric utility | Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 187,590 | 195,868 | 377,856 | 371,613
Electric utility | Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 159,874 | 217,278 | 356,979 | 404,686
Electric utility | Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 176,467 | 231,869 | 392,687 | 430,795
Electric utility | Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,779 | 3,774 | 5,237 | 7,852
Electric utility | Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Electric utility | Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 8,505 | (15,005) | (1,102) | (2,667)
Electric utility | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,826 | (20,360) | (12,478) | (14,153)
Electric utility | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Electric utility | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Electric utility | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,679 | 5,355 | 11,376 | 11,486
Bank |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 7,211 | 11,632 | 18,767 | 22,865
Total revenues | 74,714 | 81,687 | 154,452 | 164,739
Bank | Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 7,211 | 11,632 | 18,767 | 22,865
Bank | Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Bank | Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Bank | Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Bank | Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Bank | Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Bank | Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 7,211 | 11,632 | 18,767 | 22,865
Bank | Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 67,503 | 70,055 | 135,685 | 141,874
Bank | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Bank | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 59,829 | 66,155 | 124,804 | 134,643
Bank | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7,674 | 3,900 | 10,881 | 7,231
Bank | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Total revenues | 16 | 14 | 22 | 82
Other | Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Other | Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 16 | 14 | 22 | 82
Other | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 16 | $ 14 | $ 22 | $ 82

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