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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