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Segment financial information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment financial information |  |  |
Total revenues | $ 645,874 | $ 591,562 |
Income (loss) before income taxes | 53,276 | 51,582 |
Income taxes (benefit) | 12,556 | 16,916 |
Net income | 40,720 | 34,666 |
Preferred stock dividends of subsidiaries | 473 | 473 |
Net income for common stock | 40,247 | 34,193 |
Total assets | 12,702,718 |  | $ 12,534,160
Revenues from external customers |  |  |
Segment financial information |  |  |
Total revenues | 645,874 | 591,562 |
Intersegment revenues (eliminations) |  |  |
Segment financial information |  |  |
Total revenues | 0 | 0 |
Electric utility |  |  |
Segment financial information |  |  |
Total revenues | 570,427 | 518,611 |
Income (loss) before income taxes | 37,149 | 34,722 |
Income taxes (benefit) | 9,175 | 12,758 |
Net income | 27,974 | 21,964 |
Preferred stock dividends of subsidiaries | 499 | 499 |
Net income for common stock | 27,475 | 21,465 |
Total assets | 5,710,569 |  | 5,630,613
Electric utility | Revenues from external customers |  |  |
Segment financial information |  |  |
Total revenues | 570,414 | 518,566 |
Electric utility | Intersegment revenues (eliminations) |  |  |
Segment financial information |  |  |
Total revenues | 13 | 45 |
Bank |  |  |
Segment financial information |  |  |
Total revenues | 75,419 | 72,856 |
Income (loss) before income taxes | 24,500 | 24,160 |
Income taxes (benefit) | 5,540 | 8,347 |
Net income | 18,960 | 15,813 |
Preferred stock dividends of subsidiaries | 0 | 0 |
Net income for common stock | 18,960 | 15,813 |
Total assets | 6,889,445 |  | 6,798,659
Bank | Revenues from external customers |  |  |
Segment financial information |  |  |
Total revenues | 75,419 | 72,856 |
Bank | Intersegment revenues (eliminations) |  |  |
Segment financial information |  |  |
Total revenues | 0 | 0 |
Other |  |  |
Segment financial information |  |  |
Total revenues | 28 | 95 |
Income (loss) before income taxes | (8,373) | (7,300) |
Income taxes (benefit) | (2,159) | (4,189) |
Net income | (6,214) | (3,111) |
Preferred stock dividends of subsidiaries | (26) | (26) |
Net income for common stock | (6,188) | (3,085) |
Total assets | 102,704 |  | $ 104,888
Other | Revenues from external customers |  |  |
Segment financial information |  |  |
Total revenues | 41 | 140 |
Other | Intersegment revenues (eliminations) |  |  |
Segment financial information |  |  |
Total revenues | $ (13) | $ (45) |

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