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Segment financial information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Segment financial information |  |  |
Total revenues | $ 591,562 | $ 550,960 |
Income (loss) before income taxes | 51,582 | 51,126 |
Income taxes (benefit) | 16,916 | 18,301 |
Net income | 34,666 | 32,825 |
Preferred stock dividends of subsidiaries | 473 | 473 |
Net income for common stock | 34,193 | 32,352 |
Total assets | 12,543,275 |  | $ 12,425,506
Electric utility |  |  |
Segment financial information |  |  |
Total revenues | 518,611 | 482,052 |
Income (loss) before income taxes | 34,722 | 40,419 |
Income taxes (benefit) | 12,758 | 14,553 |
Net income | 21,964 | 25,866 |
Preferred stock dividends of subsidiaries | 499 | 499 |
Net income for common stock | 21,465 | 25,367 |
Total assets | 5,969,042 |  | 5,975,428
Bank |  |  |
Segment financial information |  |  |
Total revenues | 72,856 | 68,840 |
Income (loss) before income taxes | 24,160 | 19,594 |
Income taxes (benefit) | 8,347 | 6,921 |
Net income | 15,813 | 12,673 |
Preferred stock dividends of subsidiaries | 0 | 0 |
Net income for common stock | 15,813 | 12,673 |
Total assets | 6,559,646 |  | 6,421,357
Other |  |  |
Segment financial information |  |  |
Total revenues | 95 | 68 |
Income (loss) before income taxes | (7,300) | (8,887) |
Income taxes (benefit) | (4,189) | (3,173) |
Net income | (3,111) | (5,714) |
Preferred stock dividends of subsidiaries | (26) | (26) |
Net income for common stock | (3,085) | (5,688) |
Total assets | 14,587 |  | $ 28,721
Revenues from external customers |  |  |
Segment financial information |  |  |
Total revenues | 591,562 | 550,960 |
Revenues from external customers | Electric utility |  |  |
Segment financial information |  |  |
Total revenues | 518,566 | 482,045 |
Revenues from external customers | Bank |  |  |
Segment financial information |  |  |
Total revenues | 72,856 | 68,840 |
Revenues from external customers | Other |  |  |
Segment financial information |  |  |
Total revenues | 140 | 75 |
Intersegment revenues (eliminations) |  |  |
Segment financial information |  |  |
Total revenues | 0 | 0 |
Intersegment revenues (eliminations) | Electric utility |  |  |
Segment financial information |  |  |
Total revenues | 45 | 7 |
Intersegment revenues (eliminations) | Bank |  |  |
Segment financial information |  |  |
Total revenues | 0 | 0 |
Intersegment revenues (eliminations) | Other |  |  |
Segment financial information |  |  |
Total revenues | $ (45) | $ (7) |

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