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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 835,984 | $ 604,827 | $ 1,536,815 | $ 1,146,127
Total revenues from other sources | 59,623 | 75,430 | 143,860 | 177,076
Revenues | 895,607 | 680,257 | 1,680,675 | 1,323,203
Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,797 | 11,569 | 24,793 | 22,947
Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 824,187 | 593,258 | 1,512,022 | 1,123,180
Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 259,433 | 196,318 | 484,007 | 377,557
Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 264,701 | 192,103 | 484,298 | 360,568
Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 293,847 | 201,536 | 534,970 | 378,351
Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,873 | 2,212 | 6,299 | 4,691
Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,797 | 11,569 | 24,793 | 22,947
Other sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,333 | 1,089 | 2,448 | 2,013
Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | (11,428) | 2,854 | 1,458 | 31,283
Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 62,822 | 62,066 | 122,811 | 120,686
Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 705 | 3,625 | 2,835 | 10,758
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 7,524 | 6,885 | 16,756 | 14,349
Electric utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 822,854 | 592,169 | 1,509,574 | 1,121,167
Total revenues from other sources | (3,981) | 9,710 | 18,091 | 45,576
Revenues | 818,873 | 601,879 | 1,527,665 | 1,166,743
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 | 822,854 | 592,169 | 1,509,574 | 1,121,167
Electric utility | Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 259,433 | 196,318 | 484,007 | 377,557
Electric utility | Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 264,701 | 192,103 | 484,298 | 360,568
Electric utility | Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 293,847 | 201,536 | 534,970 | 378,351
Electric utility | Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,873 | 2,212 | 6,299 | 4,691
Electric utility | Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Electric utility | Other sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Electric utility | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | (11,428) | 2,854 | 1,458 | 31,283
Electric utility | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 0 | 0 | 0 | 0
Electric utility | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 0 | 0 | 0 | 0
Electric utility | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 7,447 | 6,856 | 16,633 | 14,293
Bank |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,797 | 11,569 | 24,793 | 22,947
Total revenues from other sources | 63,527 | 65,691 | 125,646 | 131,444
Revenues | 75,324 | 77,260 | 150,439 | 154,391
Bank | Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,797 | 11,569 | 24,793 | 22,947
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 | 11,797 | 11,569 | 24,793 | 22,947
Bank | Other sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Bank | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 0 | 0 | 0 | 0
Bank | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 62,822 | 62,066 | 122,811 | 120,686
Bank | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 705 | 3,625 | 2,835 | 10,758
Bank | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 0 | 0 | 0 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,333 | 1,089 | 2,448 | 2,013
Total revenues from other sources | 77 | 29 | 123 | 56
Revenues | 1,410 | 1,118 | 2,571 | 2,069
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 | 1,333 | 1,089 | 2,448 | 2,013
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 | Other sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,333 | 1,089 | 2,448 | 2,013
Other | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 0 | 0 | 0 | 0
Other | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 0 | 0 | 0 | 0
Other | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 0 | 0 | 0 | 0
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | $ 77 | $ 29 | $ 123 | $ 56

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