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Note 9 - Net Income Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
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) |  | 2017 |  |  | 2016 |
Basic: |  |  |  |  |  |  |  |
Net income |  | $ | 27,017 |  |  | $ | 23,322 |
Average common shares outstanding |  |  | 34,070 |  |  |  | 33,519 |
Basic net income per common share |  | $ | 0.79 |  |  | $ | 0.70 |
Diluted: |  |  |  |  |  |  |  |
Net income |  | $ | 27,017 |  |  | $ | 23,322 |
Average common shares outstanding |  |  | 34,070 |  |  |  | 33,519 |
Adjustment for common share equivalents |  |  | 214 |  |  |  | 585 |
Average common shares outstanding-diluted |  |  | 34,284 |  |  |  | 34,104 |
Diluted net income per common share |  | $ | 0.79 |  |  | $ | 0.68 |
Anti-dilutive shares |  |  | 7 |  |  |  | 5 |

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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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