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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information |
|  | Year Ended December 31, 2018 |
(in thousands, except per share amounts) |  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |
Operating revenues |  | $ | 639,077 |  |  | $ | 625,590 |  |  | $ | 617,050 |  |  | $ | 666,791 |
Interest income |  |  | 137,734 |  |  |  | 154,421 |  |  |  | 169,760 |  |  |  | 184,534 |
Total revenues |  |  | 776,811 |  |  |  | 780,011 |  |  |  | 786,810 |  |  |  | 851,325 |
Interest expense |  |  | 26,453 |  |  |  | 37,279 |  |  |  | 48,468 |  |  |  | 57,876 |
Net revenues |  |  | 750,358 |  |  |  | 742,732 |  |  |  | 738,342 |  |  |  | 793,449 |
Total non-interest expenses |  |  | 630,804 |  |  |  | 624,385 |  |  |  | 597,812 |  |  |  | 637,518 |
Income before income tax expense |  |  | 119,554 |  |  |  | 118,347 |  |  |  | 140,530 |  |  |  | 155,931 |
Provision for income taxes |  |  | 30,793 |  |  |  | 31,060 |  |  |  | 36,672 |  |  |  | 41,869 |
Net income |  |  | 88,761 |  |  |  | 87,287 |  |  |  | 103,858 |  |  |  | 114,062 |
Preferred dividends |  |  | 2,344 |  |  |  | 2,344 |  |  |  | 2,343 |  |  |  | 2,344 |
Net income available to common shareholders |  | $ | 86,417 |  |  | $ | 84,943 |  |  | $ | 101,515 |  |  | $ | 111,718 |
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.20 |  |  | $ | 1.18 |  |  | $ | 1.41 |  |  | $ | 1.56 |
Diluted |  | $ | 1.06 |  |  | $ | 1.04 |  |  | $ | 1.25 |  |  | $ | 1.38 |
Weighted-average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 71,999 |  |  |  | 71,692 |  |  |  | 71,919 |  |  |  | 71,666 |
Diluted |  |  | 81,789 |  |  |  | 81,299 |  |  |  | 81,484 |  |  |  | 80,706 |
Cash dividends declared per common share |  | $ | 0.12 |  |  | $ | 0.12 |  |  | $ | 0.12 |  |  | $ | 0.12 |
|  | Year Ended December 31, 2017 |
(in thousands, except per share amounts) |  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |
Operating revenues |  | $ | 590,474 |  |  | $ | 633,340 |  |  | $ | 620,932 |  |  | $ | 697,335 |
Interest income |  |  | 100,953 |  |  |  | 108,951 |  |  |  | 117,862 |  |  |  | 126,615 |
Total revenues |  |  | 691,427 |  |  |  | 742,291 |  |  |  | 738,794 |  |  |  | 823,950 |
Interest expense |  |  | 15,896 |  |  |  | 16,644 |  |  |  | 17,625 |  |  |  | 19,865 |
Net revenues |  |  | 675,531 |  |  |  | 725,647 |  |  |  | 721,169 |  |  |  | 804,085 |
Total non-interest expenses |  |  | 596,512 |  |  |  | 642,449 |  |  |  | 613,030 |  |  |  | 804,905 |
Income before income tax expense |  |  | 79,019 |  |  |  | 83,198 |  |  |  | 108,139 |  |  |  | (820 | )
Provision for income taxes |  |  | 13,507 |  |  |  | 30,387 |  |  |  | 41,603 |  |  |  | 1,168 |
Net income |  |  | 65,512 |  |  |  | 52,811 |  |  |  | 66,536 |  |  |  | (1,988 | )
Preferred dividends |  |  | 2,344 |  |  |  | 2,344 |  |  |  | 2,343 |  |  |  | 2,344 |
Net income available to common shareholders |  | $ | 63,168 |  |  | $ | 50,467 |  |  | $ | 64,193 |  |  | $ | (4,332 | )
Earnings per common share (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.92 |  |  | $ | 0.74 |  |  | $ | 0.94 |  |  | $ | (0.06 | )
Diluted |  | $ | 0.78 |  |  | $ | 0.63 |  |  | $ | 0.79 |  |  | $ | (0.06 | )
Weighted-average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 68,386 |  |  |  | 68,556 |  |  |  | 68,522 |  |  |  | 68,782 |
Diluted |  |  | 80,695 |  |  |  | 80,021 |  |  |  | 80,881 |  |  |  | 68,782 |
Cash dividends declared per common share |  | $ | — |  |  | $ | — |  |  | $ | 0.10 |  |  | $ | 0.10 |
| (1) | Earnings per share for the three months ended December 31, 2017 is calculated using the basic weighted average number of common shares outstanding, not fully dilutive shares, as they are anti-dilutive in periods a loss is incurred.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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