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Segment financial information (Tables) | 6 Months Ended
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Jun. 30, 2023
Segment Reporting [Abstract] |
Schedule of Segment Financial Information |
(in thousands) |  | Electric utility |  | Bank |  | Other |  | Total
Three months ended June 30, 2023 |  |  |  |  |  |  |  |
Revenues |  | $ | 794,191 |  |  | $ | 96,885 |  |  | $ | 4,609 |  |  | $ | 895,685 |
Income (loss) before income taxes |  | $ | 58,868 |  |  | $ | 25,055 |  |  | $ | (14,556) |  |  | $ | 69,367 |
Income taxes (benefit) |  | 13,070 |  |  | 4,851 |  |  | (3,637) |  |  | 14,284 |
Net income (loss) |  | 45,798 |  |  | 20,204 |  |  | (10,919) |  |  | 55,083 |
Preferred stock dividends of subsidiaries |  | 499 |  |  | — |  |  | (26) |  |  | 473 |
Net income (loss) for common stock |  | $ | 45,299 |  |  | $ | 20,204 |  |  | $ | (10,893) |  |  | $ | 54,610 |
Six months ended June 30, 2023 |  |  |  |  |  |  |  |
Revenues |  | $ | 1,624,552 |  |  | $ | 190,742 |  |  | $ | 8,628 |  |  | $ | 1,823,922 |
Income (loss) before income taxes |  | $ | 119,976 |  |  | $ | 48,762 |  |  | $ | (29,067) |  |  | $ | 139,671 |
Income taxes (benefit) |  | 26,670 |  |  | 9,996 |  |  | (7,272) |  |  | 29,394 |
Net income (loss) |  | 93,306 |  |  | 38,766 |  |  | (21,795) |  |  | 110,277 |
Preferred stock dividends of subsidiaries |  | 998 |  |  | — |  |  | (52) |  |  | 946 |
Net income (loss) for common stock |  | $ | 92,308 |  |  | $ | 38,766 |  |  | $ | (21,743) |  |  | $ | 109,331 |
Total assets (at June 30, 2023) |  | $ | 6,761,593 |  |  | $ | 9,620,691 |  |  | $ | 137,025 |  |  | $ | 16,519,309 |
Three months ended June 30, 2022 |  |  |  |  |  |  |  |
Revenues |  | $ | 818,873 |  |  | $ | 75,324 |  |  | $ | 1,410 |  |  | $ | 895,607 |
Income (loss) before income taxes |  | $ | 56,613 |  |  | $ | 22,109 |  |  | $ | (12,505) |  |  | $ | 66,217 |
Income taxes (benefit) |  | 11,979 |  |  | 4,643 |  |  | (3,419) |  |  | 13,203 |
Net income (loss) |  | 44,634 |  |  | 17,466 |  |  | (9,086) |  |  | 53,014 |
Preferred stock dividends of subsidiaries |  | 499 |  |  | — |  |  | (26) |  |  | 473 |
Net income (loss) for common stock |  | $ | 44,135 |  |  | $ | 17,466 |  |  | $ | (9,060) |  |  | $ | 52,541 |
Six months ended June 30, 2022 |  |  |  |  |  |  |  |
Revenues from external customers and other sources |  | $ | 1,527,661 |  |  | $ | 150,439 |  |  | $ | 2,575 |  |  | $ | 1,680,675 |
Intersegment revenues (eliminations) |  | 4 |  |  | — |  |  | (4) |  |  | — |
Revenues |  | $ | 1,527,665 |  |  | $ | 150,439 |  |  | $ | 2,571 |  |  | $ | 1,680,675 |
Income (loss) before income taxes |  | $ | 116,059 |  |  | $ | 52,324 |  |  | $ | (14,686) |  |  | $ | 153,697 |
Income taxes (benefit) |  | 24,517 |  |  | 10,988 |  |  | (4,462) |  |  | 31,043 |
Net income (loss) |  | 91,542 |  |  | 41,336 |  |  | (10,224) |  |  | 122,654 |
Preferred stock dividends of subsidiaries |  | 998 |  |  | — |  |  | (52) |  |  | 946 |
Net income (loss) for common stock |  | $ | 90,544 |  |  | $ | 41,336 |  |  | $ | (10,172) |  |  | $ | 121,708 |
Total assets (at December 31, 2022) |  | $ | 6,597,467 |  |  | $ | 9,545,970 |  |  | $ | 140,807 |  |  | $ | 16,284,244 |

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