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Segment financial information (Tables) | 3 Months Ended
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Mar. 31, 2016
Segment Reporting [Abstract] |
Schedule of segment financial information |
(in thousands) |  | Electric utility |  | Bank |  | Other |  | Total
Three months ended March 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  | $ | 482,045 |  |  | $ | 68,840 |  |  | $ | 75 |  |  | $ | 550,960 |
Intersegment revenues (eliminations) |  | 7 |  |  | — |  |  | (7 | ) |  | — |
Revenues |  | 482,052 |  |  | 68,840 |  |  | 68 |  |  | 550,960 |
Income (loss) before income taxes |  | 40,419 |  |  | 19,594 |  |  | (8,887 | ) |  | 51,126 |
Income taxes (benefit) |  | 14,553 |  |  | 6,921 |  |  | (3,173 | ) |  | 18,301 |
Net income (loss) |  | 25,866 |  |  | 12,673 |  |  | (5,714 | ) |  | 32,825 |
Preferred stock dividends of subsidiaries |  | 499 |  |  | — |  |  | (26 | ) |  | 473 |
Net income (loss) for common stock |  | 25,367 |  |  | 12,673 |  |  | (5,688 | ) |  | 32,352 |
Total assets (at March 31, 2016) |  | 5,662,371 |  |  | 6,140,514 |  |  | 67,621 |  |  | 11,870,506 |
Three months ended March 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  | $ | 573,431 |  |  | $ | 64,348 |  |  | $ | 83 |  |  | $ | 637,862 |
Intersegment revenues (eliminations) |  | 11 |  |  | — |  |  | (11 | ) |  | — |
Revenues |  | 573,442 |  |  | 64,348 |  |  | 72 |  |  | 637,862 |
Income (loss) before income taxes |  | 43,223 |  |  | 20,631 |  |  | (11,536 | ) |  | 52,318 |
Income taxes (benefit) |  | 15,850 |  |  | 7,156 |  |  | (3,027 | ) |  | 19,979 |
Net income (loss) |  | 27,373 |  |  | 13,475 |  |  | (8,509 | ) |  | 32,339 |
Preferred stock dividends of subsidiaries |  | 499 |  |  | — |  |  | (26 | ) |  | 473 |
Net income (loss) for common stock |  | 26,874 |  |  | 13,475 |  |  | (8,483 | ) |  | 31,866 |
Total assets (at December 31, 2015)* |  | 5,672,210 |  |  | 6,014,755 |  |  | 95,053 |  |  | 11,782,018 |
* See Note 11 for the impact to prior period financial information of the adoption of Accounting Standards Update (ASU) No. 2015-03.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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