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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Basic and diluted earnings per share | Basic and diluted earnings per share has been computed based on the following:
| Three Months ended |  | Six Months ended
(Dollars in thousands, except per share data) | June 30, 2015 |  | June 30, 2014 |  | June 30, 2015 |  | June 30, 2014
Net income available to common stockholders, basic and diluted | $ | 29,335 |  |  | 28,677 |  |  | 57,005 |  |  | 55,407 |
Average outstanding shares - basic | 75,530,591 |  |  | 74,467,576 |  |  | 75,369,366 |  |  | 74,452,568 |
Add: dilutive stock options and awards | 35,064 |  |  | 32,084 |  |  | 38,255 |  |  | 38,891 |
Average outstanding shares - diluted | 75,565,655 |  |  | 74,499,660 |  |  | 75,407,621 |  |  | 74,491,459 |
Basic earnings per share | $ | 0.39 |  |  | 0.38 |  |  | 0.76 |  |  | 0.74 |
Diluted earnings per share | $ | 0.39 |  |  | 0.38 |  |  | 0.76 |  |  | 0.74 |

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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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