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Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 604,827 $ 532,921 $ 1,146,127 $ 1,151,526
Total revenues from other sources 75,430 76,024 177,076 134,605
Revenues 680,257 608,945 1,323,203 1,286,131
Services/goods transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,569 7,211 22,947 18,767
Services/goods transferred over time        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 593,258 525,710 1,123,180 1,132,759
Electric energy sales - residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 196,318 187,590 377,557 377,856
Electric energy sales - commercial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 192,103 159,874 360,568 356,979
Electric energy sales - large light and power        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 201,536 176,467 378,351 392,687
Electric energy sales - other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2,212 1,779 4,691 5,237
Bank fees        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,569 7,211 22,947 18,767
Other sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1,089   2,013  
Regulatory revenue        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 2,854 2,826 31,283 (12,478)
Bank interest and dividend income        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 62,066 59,829 120,686 124,804
Other bank noninterest income        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 3,625 7,674 10,758 10,881
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 6,885 5,695 14,349 11,398
Electric utility        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 592,169 525,710 1,121,167 1,132,759
Total revenues from other sources 9,710 8,505 45,576 (1,102)
Revenues 601,879 534,215 1,166,743 1,131,657
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 592,169 525,710 1,121,167 1,132,759
Electric utility | Electric energy sales - residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 196,318 187,590 377,557 377,856
Electric utility | Electric energy sales - commercial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 192,103 159,874 360,568 356,979
Electric utility | Electric energy sales - large light and power        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 201,536 176,467 378,351 392,687
Electric utility | Electric energy sales - other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2,212 1,779 4,691 5,237
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  
Electric utility | Regulatory revenue        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 2,854 2,826 31,283 (12,478)
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 6,856 5,679 14,293 11,376
Bank        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,569 7,211 22,947 18,767
Total revenues from other sources 65,691 67,503 131,444 135,685
Revenues 77,260 74,714 154,391 154,452
Bank | Services/goods transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,569 7,211 22,947 18,767
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 11,569 7,211 22,947 18,767
Bank | Other sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 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 62,066 59,829 120,686 124,804
Bank | Other bank noninterest income        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 3,625 7,674 10,758 10,881
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 1,089 0 2,013 0
Total revenues from other sources 29 16 56 22
Revenues 1,118 16 2,069 22
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 1,089 0 2,013 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 | Other sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1,089   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 $ 29 $ 16 $ 56 $ 22