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Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 990,338 $ 690,618 $ 2,527,153 $ 1,836,745
Total revenues from other sources 51,859 66,286 195,719 243,362
Revenues 1,042,197 756,904 2,722,872 2,080,107
Services/goods transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 12,058 11,186 36,851 34,133
Services/goods transferred over time        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 978,280 679,432 2,490,302 1,802,612
Electric energy sales - residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 306,417 228,878 790,424 606,435
Electric energy sales - commercial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 309,940 217,468 794,238 578,036
Electric energy sales - large light and power        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 351,763 229,129 886,733 607,480
Electric energy sales - other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 5,400 2,779 11,699 7,470
Bank fees        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 12,058 11,186 36,851 34,133
Other sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,760 1,178 7,208 3,191
Regulatory revenue        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources (26,301) (5,717) (24,843) 25,566
Bank interest and dividend income        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 68,417 61,441 191,228 182,127
Other bank noninterest income        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 936 3,581 3,771 14,339
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 8,807 6,981 25,563 21,330
Electric utility        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 973,520 678,254 2,483,094 1,799,421
Total revenues from other sources (17,549) 1,245 542 46,821
Revenues 955,971 679,499 2,483,636 1,846,242
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 973,520 678,254 2,483,094 1,799,421
Electric utility | Electric energy sales - residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 306,417 228,878 790,424 606,435
Electric utility | Electric energy sales - commercial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 309,940 217,468 794,238 578,036
Electric utility | Electric energy sales - large light and power        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 351,763 229,129 886,733 607,480
Electric utility | Electric energy sales - other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 5,400 2,779 11,699 7,470
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 (26,301) (5,717) (24,843) 25,566
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 8,752 6,962 25,385 21,255
Bank        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 12,058 11,186 36,851 34,133
Total revenues from other sources 69,353 65,022 194,999 196,466
Revenues 81,411 76,208 231,850 230,599
Bank | Services/goods transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 12,058 11,186 36,851 34,133
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 12,058 11,186 36,851 34,133
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 68,417 61,441 191,228 182,127
Bank | Other bank noninterest income        
Disaggregation of Revenue [Line Items]        
Total revenues from other sources 936 3,581 3,771 14,339
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 4,760 1,178 7,208 3,191
Total revenues from other sources 55 19 178 75
Revenues 4,815 1,197 7,386 3,266
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 4,760 1,178 7,208 3,191
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 4,760 1,178 7,208 3,191
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 $ 55 $ 19 $ 178 $ 75