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Segment financial information | 3 Months Ended
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Mar. 31, 2017
Segment Reporting [Abstract] |
Segment financial information | Segment financial information
(in thousands) |  | Electric utility |  | Bank |  | Other |  | Total
Three months ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  | $ | 518,566 |  |  | $ | 72,856 |  |  | $ | 140 |  |  | $ | 591,562 |
Intersegment revenues (eliminations) |  | 45 |  |  | — |  |  | (45 | ) |  | — |
Revenues |  | $ | 518,611 |  |  | $ | 72,856 |  |  | $ | 95 |  |  | $ | 591,562 |
Income (loss) before income taxes |  | $ | 34,722 |  |  | $ | 24,160 |  |  | $ | (7,300 | ) |  | $ | 51,582 |
Income taxes (benefit) |  | 12,758 |  |  | 8,347 |  |  | (4,189 | ) |  | 16,916 |
Net income (loss) |  | 21,964 |  |  | 15,813 |  |  | (3,111 | ) |  | 34,666 |
Preferred stock dividends of subsidiaries |  | 499 |  |  | — |  |  | (26 | ) |  | 473 |
Net income (loss) for common stock |  | $ | 21,465 |  |  | $ | 15,813 |  |  | $ | (3,085 | ) |  | $ | 34,193 |
Total assets (at March 31, 2017) |  | $ | 5,969,042 |  |  | $ | 6,559,646 |  |  | $ | 14,587 |  |  | $ | 12,543,275 |
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 December 31, 2016) |  | $ | 5,975,428 |  |  | $ | 6,421,357 |  |  | $ | 28,721 |  |  | $ | 12,425,506 |
Intercompany electricity sales of the Utilities to the bank and “other” segments are not eliminated because those segments would need to purchase electricity from another source if it were not provided by the Utilities and the profit on such sales is nominal. Bank fees that ASB charges the Utilities and “other” segments are not eliminated because those segments would pay fees to another financial institution if they were to bank with another institution and the profit on such fees is nominal.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8971-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8595-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8538-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8864-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 14: 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 + Details
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