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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 550,412 | $ 725,111 | $ 1,701,967 | $ 1,962,922
Revenues | 641,427 | 770,882 | 1,927,558 | 2,147,982
Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,589 | 12,111 | 28,356 | 34,976
Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 540,823 | 713,000 | 1,673,611 | 1,927,946
Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 191,321 | 230,051 | 569,177 | 601,664
Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 171,156 | 230,411 | 528,135 | 635,097
Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 176,200 | 248,457 | 568,887 | 679,252
Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,935 | 4,081 | 7,172 | 11,933
Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,589 | 12,111 | 28,356 | 34,976
Solar energy sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 211 |  | 240 |
Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 91,015 | 45,771 | 225,591 | 185,060
Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,457 | (30,800) | 2,979 | (44,953)
Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 59,640 | 66,859 | 184,444 | 201,502
Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,415 | 3,578 | 20,296 | 10,809
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,503 | 6,134 | 17,872 | 17,702
Electric utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 540,612 | 713,000 | 1,673,371 | 1,927,946
Revenues | 562,568 | 688,330 | 1,694,225 | 1,900,609
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 | 540,612 | 713,000 | 1,673,371 | 1,927,946
Electric utility | Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 191,321 | 230,051 | 569,177 | 601,664
Electric utility | Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 171,156 | 230,411 | 528,135 | 635,097
Electric utility | Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 176,200 | 248,457 | 568,887 | 679,252
Electric utility | Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,935 | 4,081 | 7,172 | 11,933
Electric utility | Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Electric utility | Solar energy sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Electric utility | Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 21,956 | (24,670) | 20,854 | (27,337)
Electric utility | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,457 | (30,800) | 2,979 | (44,953)
Electric utility | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Electric utility | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Electric utility | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,499 | 6,130 | 17,875 | 17,616
Bank |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,589 | 12,111 | 28,356 | 34,976
Revenues | 78,644 | 82,548 | 233,096 | 247,287
Bank | Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,589 | 12,111 | 28,356 | 34,976
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 | 9,589 | 12,111 | 28,356 | 34,976
Bank | Solar energy sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Bank | Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 69,055 | 70,437 | 204,740 | 212,311
Bank | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Bank | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 59,640 | 66,859 | 184,444 | 201,502
Bank | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,415 | 3,578 | 20,296 | 10,809
Bank | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 211 | 0 | 240 | 0
Revenues | 215 | 4 | 237 | 86
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 | 211 | 0 | 240 | 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 | Solar energy sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 211 |  | 240 |
Other | Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4 | 4 | (3) | 86
Other | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Other | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Other | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 4 | $ 4 | $ (3) | $ 86

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