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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Basic and diluted earnings per share |
| Three Months ended
(Dollars in thousands, except per share data) | March 31, 2013 |  | March 31, 2012
Net income available to common stockholders, basic and diluted | $ | 20,768 |  |  | 16,333 |
Average outstanding shares - basic | 71,965,665 |  |  | 71,915,073 |
Add: dilutive stock options and awards | 47,512 |  |  | 57 |
Average outstanding shares - diluted | 72,013,177 |  |  | 71,915,130 |
Basic earnings per share | $ | 0.29 |  |  | 0.23 |
Diluted earnings per share | $ | 0.29 |  |  | 0.23 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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