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Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 690,618 $ 550,412 $ 1,836,745 $ 1,701,967
Total revenues from other sources 66,286 91,015 243,362 225,591
Revenues 756,904 641,427 2,080,107 1,927,558
Services/goods transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,186 9,589 34,133 28,356
Services/goods transferred over time        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 679,432 540,823 1,802,612 1,673,611
Electric energy sales - residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 228,878 191,321 606,435 569,177
Electric energy sales - commercial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 217,468 171,156 578,036 528,135
Electric energy sales - large light and power        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 229,129 176,200 607,480 568,887
Electric energy sales - other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2,779 1,935 7,470 7,172
Bank fees        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,186 9,589 34,133 28,356
Other sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1,178 211 3,191 240
Regulatory revenue        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources (5,717) 15,457 25,566 2,979
Bank interest and dividend income        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 61,441 59,640 182,127 184,444
Other bank noninterest income        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 3,581 9,415 14,339 20,296
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 6,981 6,503 21,330 17,872
Electric utility        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 678,254 540,612 1,799,421 1,673,371
Total revenues from other sources 1,245 21,956 46,821 20,854
Revenues 679,499 562,568 1,846,242 1,694,225
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 678,254 540,612 1,799,421 1,673,371
Electric utility | Electric energy sales - residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 228,878 191,321 606,435 569,177
Electric utility | Electric energy sales - commercial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 217,468 171,156 578,036 528,135
Electric utility | Electric energy sales - large light and power        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 229,129 176,200 607,480 568,887
Electric utility | Electric energy sales - other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2,779 1,935 7,470 7,172
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 (5,717) 15,457 25,566 2,979
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 6,962 6,499 21,255 17,875
Bank        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,186 9,589 34,133 28,356
Total revenues from other sources 65,022 69,055 196,466 204,740
Revenues 76,208 78,644 230,599 233,096
Bank | Services/goods transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,186 9,589 34,133 28,356
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 11,186 9,589 34,133 28,356
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 61,441 59,640 182,127 184,444
Bank | Other bank noninterest income        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 3,581 9,415 14,339 20,296
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 1,178 211 3,191 240
Total revenues from other sources 19 4 75 (3)
Revenues 1,197 215 3,266 237
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 1,178 211 3,191 240
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 1,178 211 3,191 240
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 $ 19 $ 4 $ 75 $ (3)