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Net Income Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Common Share Based on Weighted-average Shares Outstanding | Basic and diluted net income per common share based on weighted-average shares outstanding are calculated as follows:
|  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
|  | (Dollars in thousands, except per share data) |
Three Months Ended September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 17,982 |  |  |  | 15,631,094 |  |  | $ | 1.15 |
Dilutive effect of stock options |  |  | — |  |  |  | 291,115 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 17,982 |  |  |  | 15,922,209 |  |  | $ | 1.13 |
Three Months Ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 15,630 |  |  |  | 15,581,593 |  |  | $ | 1.01 |
Dilutive 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 |
Nine Months Ended September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 52,054 |  |  |  | 15,571,990 |  |  | $ | 3.34 |
Dilutive effect of stock options |  |  | — |  |  |  | 290,790 |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders plus assumed exercises of stock options |  | $ | 52,054 |  |  |  | 15,862,780 |  |  | $ | 3.28 |
Nine Months Ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders |  | $ | 50,442 |  |  |  | 15,542,027 |  |  | $ | 3.25 |
Dilutive 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 |
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 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, 2016 |  |  | 141,565 |  |  | $ | 60.63 |
Three Months Ended September 30, 2015 |  |  | 145,261 |  |  |  | 60.51 |
Nine Months Ended September 30, 2016 |  |  | 183,314 |  |  |  | 59.74 |
Nine Months Ended September 30, 2015 |  |  | 165,927 |  |  |  | 58.33 |

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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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