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Note 7 - Net Income Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended March 31, |
(dollars and shares in thousands, except per share data) |  | 2015 |  |  | 2014 |
Basic: |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 19,238 |  |  | $ | 12,358 |
Average common shares outstanding |  |  | 31,083 |  |  |  | 25,928 |
Basic net income per common share |  | $ | 0.62 |  |  | $ | 0.48 |
Diluted: |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 19,238 |  |  | $ | 12,358 |
Average common shares outstanding |  |  | 31,083 |  |  |  | 25,928 |
Adjustment for common share equivalents |  |  | 693 |  |  |  | 647 |
Average common shares outstanding-diluted |  |  | 31,776 |  |  |  | 26,575 |
Diluted net income per common share |  | $ | 0.61 |  |  | $ | 0.47 |
Anti-dilutive shares |  |  | 13,000 |  |  |  | 21,000 |

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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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