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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Basic and diluted earnings per share |
| Three Months ended |  | Nine Months ended
(Dollars in thousands, except per share data) | September 30, 2013 |  | September 30, 2012 |  | September 30, 2013 |  | September 30, 2012
Net income available to common stockholders, basic and diluted | $ | 25,628 |  |  | 19,444 |  |  | 69,098 |  |  | 54,758 |
Average outstanding shares - basic | 73,945,523 |  |  | 71,933,141 |  |  | 72,804,321 |  |  | 71,925,664 |
Add: dilutive stock options and awards | 76,348 |  |  | 40,844 |  |  | 65,154 |  |  | 97 |
Average outstanding shares - diluted | 74,021,871 |  |  | 71,973,985 |  |  | 72,869,475 |  |  | 71,925,761 |
Basic earnings per share | $ | 0.35 |  |  | 0.27 |  |  | 0.95 |  |  | 0.76 |
Diluted earnings per share | $ | 0.35 |  |  | 0.27 |  |  | 0.95 |  |  | 0.76 |

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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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