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Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Common Share | Basic and diluted net income per common share are calculated as follows:
|  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
|  | (Dollars in thousands, except per share data) |
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 86,439 |  |  |  | 31,813,572 |  |  | $ | 2.72 |
Effect of stock options |  |  | — |  |  |  | 754,533 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 86,439 |  |  |  | 32,568,105 |  |  | $ | 2.65 |
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 70,674 |  |  |  | 31,230,340 |  |  | $ | 2.27 |
Effect of stock options |  |  | — |  |  |  | 592,184 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 70,674 |  |  |  | 31,822,524 |  |  | $ | 2.22 |
Year Ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 66,170 |  |  |  | 31,118,118 |  |  | $ | 2.13 |
Effect of stock options |  |  | — |  |  |  | 654,372 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 66,170 |  |  |  | 31,772,490 |  |  | $ | 2.09 |
Average Exercise Price of Options Excluded from Computation of Diluted Net Income Per Common Share | The following table shows the number and average exercise price of options that were excluded from the computation of diluted net income per common share for each year because the options’ exercise prices were greater than the average market price of the common shares.
|  | Shares |  |  | Average Exercise Price |
December 31, 2017 |  |  | 55,337 |  |  | $ | 46.86 |
December 31, 2016 |  |  | 294,438 |  |  |  | 30.25 |
December 31, 2015 |  |  | 355,436 |  |  |  | 29.24 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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