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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Summary of earnings per share | Earnings per share consisted of the following components for the periods indicated:
| Three Months Ended |  | Six Months Ended
| June 30 |  | June 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (Dollars in thousands, except per share data)
Net income | $ | 20,563 |  |  | $ | 20,374 |  |  | $ | 41,288 |  |  | $ | 38,985 |
Weighted Average Shares |  |  |
Basic shares | 27,257,799 |  |  | 26,304,129 |  |  | 27,144,350 |  |  | 26,289,726 |
Effect of dilutive securities | 74,497 |  |  | 47,885 |  |  | 78,757 |  |  | 45,679 |
Diluted shares | 27,332,296 |  |  | 26,352,014 |  |  | 27,223,107 |  |  | 26,335,405 |
Net income per share |  |  |  |  |  |  |
Basic EPS | $ | 0.75 |  |  | $ | 0.77 |  |  | $ | 1.52 |  |  | $ | 1.48 |
Effect of dilutive securities | — |  |  | — |  |  | — |  |  | — |
Diluted EPS | $ | 0.75 |  |  | $ | 0.77 |  |  | $ | 1.52 |  |  | $ | 1.48 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | The following table illustrates the options to purchase common stock or shares of performance-based restricted stock that were excluded from the calculation of diluted earnings per share because they were anti-dilutive for the periods indicated:
| Three Months Ended |  | Six Months Ended
| June 30 |  | June 30
| 2017 |  | 2016 |  | 2017 |  | 2016
Stock options | — |  |  | — |  |  | — |  |  | 3,626 |
Performance-based restricted stock | — |  |  | — |  |  | — |  |  | — |

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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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