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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 797,257 | $ 790,988 | $ 1,572,401 | $ 1,613,372
Total revenues from other sources | 100,103 | 104,697 | 222,117 | 210,550
Revenues | 897,360 | 895,685 | 1,794,518 | 1,823,922
Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,723 | 12,281 | 25,238 | 24,303
Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 784,534 | 778,707 | 1,547,163 | 1,589,069
Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 244,539 | 239,867 | 486,061 | 495,417
Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 251,482 | 250,108 | 493,250 | 504,578
Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 280,940 | 279,811 | 552,027 | 570,789
Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,609 | 4,483 | 9,555 | 9,940
Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,723 | 12,281 | 25,238 | 24,303
Other sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,964 | 4,438 | 6,270 | 8,345
Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | (486) | 9,039 | 20,704 | 24,643
Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 86,178 | 81,741 | 174,113 | 161,220
Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 3,042 | 2,863 | 7,736 | 5,219
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 11,369 | 11,054 | 19,564 | 19,468
Electric utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 781,570 | 774,269 | 1,540,893 | 1,580,724
Total revenues from other sources | 10,761 | 19,922 | 40,016 | 43,828
Revenues | 792,331 | 794,191 | 1,580,909 | 1,624,552
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 | 781,570 | 774,269 | 1,540,893 | 1,580,724
Electric utility | Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 244,539 | 239,867 | 486,061 | 495,417
Electric utility | Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 251,482 | 250,108 | 493,250 | 504,578
Electric utility | Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 280,940 | 279,811 | 552,027 | 570,789
Electric utility | Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,609 | 4,483 | 9,555 | 9,940
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 | (486) | 9,039 | 20,704 | 24,643
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 | 11,247 | 10,883 | 19,312 | 19,185
Bank |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,723 | 12,281 | 25,238 | 24,303
Total revenues from other sources | 89,220 | 84,604 | 181,849 | 166,439
Revenues | 101,943 | 96,885 | 207,087 | 190,742
Bank | Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,723 | 12,281 | 25,238 | 24,303
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 | 12,723 | 12,281 | 25,238 | 24,303
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 | 86,178 | 81,741 | 174,113 | 161,220
Bank | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from other sources | 3,042 | 2,863 | 7,736 | 5,219
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 | 2,964 | 4,438 | 6,270 | 8,345
Total revenues from other sources | 122 | 171 | 252 | 283
Revenues | 3,086 | 4,609 | 6,522 | 8,628
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 | 2,964 | 4,438 | 6,270 | 8,345
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 | 2,964 | 4,438 | 6,270 | 8,345
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 | $ 122 | $ 171 | $ 252 | $ 283

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