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Note 1 - Basis of Presentation (Tables) | 9 Months Ended
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Sep. 30, 2017
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands, except per share data) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Net income available to common shareholders |  | $ | 28,852 |  |  | $ | 23,429 |  |  | $ | 74,037 |  |  | $ | 69,819 |
Average common shares outstanding |  |  | 32,214 |  |  |  | 30,621 |  |  |  | 31,797 |  |  |  | 30,434 |
Average potential dilutive common shares |  |  | 210 |  |  |  | 223 |  |  |  | 210 |  |  |  | 223 |
Average diluted common shares |  |  | 32,424 |  |  |  | 30,844 |  |  |  | 32,007 |  |  |  | 30,657 |
Basic earnings per share |  | $ | 0.90 |  |  | $ | 0.77 |  |  | $ | 2.33 |  |  | $ | 2.29 |
Diluted earnings per share (1) |  | $ | 0.89 |  |  | $ | 0.76 |  |  | $ | 2.31 |  |  | $ | 2.28 |

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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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