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Revenues (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following tables disaggregate revenues by major source, timing of revenue recognition, and segment:
|  | Year ended December 31, 2021 |  | Year ended December 31, 2020
(in thousands) |  | Electric utility |  | Bank |  | Other |  | Total |  | Electric utility |  | Bank |  | Other |  | Total
Revenues from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric energy sales - residential |  | $ | 830,653 |  |  | $ | — |  |  | $ | — |  |  | $ | 830,653 |  |  | $ | 766,609 |  |  | $ | — |  |  | $ | — |  |  | $ | 766,609 |
Electric energy sales - commercial |  | 791,424 |  |  | — |  |  | — |  |  | 791,424 |  |  | 703,516 |  |  | — |  |  | — |  |  | 703,516 |
Electric energy sales - large light and power |  | 837,834 |  |  | — |  |  | — |  |  | 837,834 |  |  | 751,464 |  |  | — |  |  | — |  |  | 751,464 |
Electric energy sales - other |  | 10,770 |  |  | — |  |  | — |  |  | 10,770 |  |  | 8,054 |  |  | — |  |  | — |  |  | 8,054 |
Bank fees |  | — |  |  | 46,658 |  |  | — |  |  | 46,658 |  |  | — |  |  | 38,887 |  |  | — |  |  | 38,887 |
Other sales |  | — |  |  | — |  |  | 4,086 |  |  | 4,086 |  |  | — |  |  | — |  |  | 921 |  |  | 921 |
Total revenues from contracts with customers |  | 2,470,681 |  |  | 46,658 |  |  | 4,086 |  |  | 2,521,425 |  |  | 2,229,643 |  |  | 38,887 |  |  | 921 |  |  | 2,269,451 |
Revenues from other sources |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory revenue |  | 40,069 |  |  | — |  |  | — |  |  | 40,069 |  |  | 11,869 |  |  | — |  |  | — |  |  | 11,869 |
Bank interest and dividend income |  | — |  |  | 242,266 |  |  | — |  |  | 242,266 |  |  | — |  |  | 244,663 |  |  | — |  |  | 244,663 |
Other bank noninterest income |  | — |  |  | 17,474 |  |  | — |  |  | 17,474 |  |  | — |  |  | 29,961 |  |  | — |  |  | 29,961 |
Other |  | 28,886 |  |  | — |  |  | 259 |  |  | 29,145 |  |  | 23,808 |  |  | — |  |  | 23 |  |  | 23,831 |
Total revenues from other sources |  | 68,955 |  |  | 259,740 |  |  | 259 |  |  | 328,954 |  |  | 35,677 |  |  | 274,624 |  |  | 23 |  |  | 310,324 |
Total revenues |  | $ | 2,539,636 |  |  | $ | 306,398 |  |  | $ | 4,345 |  |  | $ | 2,850,379 |  |  | $ | 2,265,320 |  |  | $ | 313,511 |  |  | $ | 944 |  |  | $ | 2,579,775 |
Timing of revenue recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Services/goods transferred at a point in time |  | $ | — |  |  | $ | 46,658 |  |  | $ | — |  |  | $ | 46,658 |  |  | $ | — |  |  | $ | 38,887 |  |  | $ | — |  |  | $ | 38,887 |
Services/goods transferred over time |  | 2,470,681 |  |  | — |  |  | 4,086 |  |  | 2,474,767 |  |  | 2,229,643 |  |  | — |  |  | 921 |  |  | 2,230,564 |
Total revenues from contracts with customers |  | $ | 2,470,681 |  |  | $ | 46,658 |  |  | $ | 4,086 |  |  | $ | 2,521,425 |  |  | $ | 2,229,643 |  |  | $ | 38,887 |  |  | $ | 921 |  |  | $ | 2,269,451 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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