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Note 8 - Net Income Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Nine Months Ended |  |  | Three Months Ended |
|  | September 30, |  |  | September 30, |
(dollars and shares in thousands, except per share data) |  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 39,097 |  |  | $ | 34,579 |  |  | $ | 13,937 |  |  | $ | 11,615 |
Average common shares outstanding |  |  | 25,978 |  |  |  | 25,689 |  |  |  | 26,024 |  |  |  | 25,784 |
Basic net income per common share |  | $ | 1.50 |  |  | $ | 1.35 |  |  | $ | 0.54 |  |  | $ | 0.45 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 39,097 |  |  | $ | 34,579 |  |  | $ | 13,937 |  |  | $ | 11,615 |
Average common shares outstanding |  |  | 25,978 |  |  |  | 25,689 |  |  |  | 26,024 |  |  |  | 25,784 |
Adjustment for common share equivalents |  |  | 640 |  |  |  | 615 |  |  |  | 630 |  |  |  | 642 |
Average common shares outstanding-diluted |  |  | 26,618 |  |  |  | 26,304 |  |  |  | 26,654 |  |  |  | 26,426 |
Diluted net income per common share |  | $ | 1.47 |  |  | $ | 1.31 |  |  | $ | 0.52 |  |  | $ | 0.44 |
Anti-dilutive shares |  |  | 21,000 |  |  |  | 101,466 |  |  |  | 21,000 |  |  |  | 95,966 |

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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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