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Net Income Per Common Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Net Income Per Common Share |
(16) | 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 |
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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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