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Note 15 - Net Income per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 2015 |  |  | 2014 |  |  | 2013 |
(dollars and shares in thousands, except per share data) |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 83,566 |  |  | $ | 53,644 |  |  | $ | 46,441 |
Average common shares outstanding |  |  | 32,836 |  |  |  | 26,684 |  |  |  | 25,726 |
Basic net income per common share |  | $ | 2.54 |  |  | $ | 2.01 |  |  | $ | 1.81 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 83,566 |  |  | $ | 53,644 |  |  | $ | 46,441 |
Average common shares outstanding |  |  | 32,836 |  |  |  | 26,684 |  |  |  | 25,726 |
Adjustment for common share equivalents |  |  | 643 |  |  |  | 867 |  |  |  | 633 |
Average common shares outstanding-diluted |  |  | 33,479 |  |  |  | 27,551 |  |  |  | 26,359 |
Diluted net income per common share |  | $ | 2.50 |  |  | $ | 1.95 |  |  | $ | 1.76 |
Anti-dilutive shares |  |  | 5 |  |  |  | 13 |  |  |  | 35 |

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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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