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Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 660,421 | $ 621,587 | $ 1,237,811 | $ 1,197,052
Total revenues | 715,485 | 685,277 | 1,377,100 | 1,331,151
Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,632 | 12,308 | 22,865 | 24,602
Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 648,789 | 609,279 | 1,214,946 | 1,172,450
Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 195,868 | 185,217 | 371,613 | 363,806
Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 217,278 | 206,169 | 404,686 | 395,167
Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 231,869 | 214,676 | 430,795 | 406,997
Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,774 | 3,968 | 7,852 | 8,028
Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,632 | 11,557 | 22,865 | 23,054
Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 55,064 | 63,690 | 139,289 | 134,099
Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (20,360) | (4,643) | (14,153) | 107
Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 66,155 | 63,261 | 134,643 | 125,263
Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,900 | 2,286 | 7,231 | 4,206
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,369 | 2,786 | 11,568 | 4,523
Electric utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 648,789 | 610,030 | 1,214,946 | 1,173,998
Total revenues | 633,784 | 608,126 | 1,212,279 | 1,178,553
Electric utility | Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 751 | 0 | 1,548
Electric utility | Services/goods transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 648,789 | 609,279 | 1,214,946 | 1,172,450
Electric utility | Electric energy sales - residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 195,868 | 185,217 | 371,613 | 363,806
Electric utility | Electric energy sales - commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 217,278 | 206,169 | 404,686 | 395,167
Electric utility | Electric energy sales - large light and power |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 231,869 | 214,676 | 430,795 | 406,997
Electric utility | Electric energy sales - other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,774 | 3,968 | 7,852 | 8,028
Electric utility | Bank fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Electric utility | Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (15,005) | (1,904) | (2,667) | 4,555
Electric utility | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (20,360) | (4,643) | (14,153) | 107
Electric utility | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Electric utility | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Electric utility | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,355 | 2,739 | 11,486 | 4,448
Bank |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,632 | 11,557 | 22,865 | 23,054
Total revenues | 81,687 | 77,104 | 164,739 | 152,523
Bank | Services/goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,632 | 11,557 | 22,865 | 23,054
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 | 11,632 | 11,557 | 22,865 | 23,054
Bank | Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 70,055 | 65,547 | 141,874 | 129,469
Bank | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Bank | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 66,155 | 63,261 | 134,643 | 125,263
Bank | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,900 | 2,286 | 7,231 | 4,206
Bank | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Total revenues | 14 | 47 | 82 | 75
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 | 0 | 0 | 0 | 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 | Revenues from Other Sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14 | 47 | 82 | 75
Other | Regulatory revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Bank interest and dividend income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Other bank noninterest income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 14 | $ 47 | $ 82 | $ 75

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