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Net Income Per Common Share | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Net Income Per Common Share |
(8) | 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) |
Three Months Ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 15,630 |  |  |  | 15,581,593 |  |  | $ | 1.01 |
Effect of stock options |  |  | — |  |  |  | 324,531 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 15,630 |  |  |  | 15,906,124 |  |  | $ | 0.98 |
Three Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 18,793 |  |  |  | 15,425,920 |  |  | $ | 1.22 |
Effect of stock options |  |  | — |  |  |  | 369,923 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 18,793 |  |  |  | 15,795,843 |  |  | $ | 1.19 |
Nine Months Ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 50,442 |  |  |  | 15,542,027 |  |  | $ | 3.25 |
Effect of stock options |  |  | — |  |  |  | 329,964 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 50,442 |  |  |  | 15,871,991 |  |  | $ | 3.18 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 48,138 |  |  |  | 15,412,611 |  |  | $ | 3.12 |
Effect of stock options |  |  | — |  |  |  | 361,686 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 48,138 |  |  |  | 15,774,297 |  |  | $ | 3.05 |
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 period because the options’ exercise prices were greater than the average market price of the common shares:
|  | Shares |  |  | Average Exercise Price |
Three Months Ended September 30, 2015 |  |  | 145,261 |  |  | $ | 60.51 |
Three Months Ended September 30, 2014 |  |  | 76,413 |  |  |  | 56.23 |
Nine Months Ended September 30, 2015 |  |  | 165,927 |  |  | $ | 58.33 |
Nine Months Ended September 30, 2014 |  |  | 63,645 |  |  |  | 55.35 |

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