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Note 15 - Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
(dollars and shares in thousands, except per share data) |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 97,707 |  |  | $ | 83,566 |  |  | $ | 53,644 |
Average common shares outstanding |  |  | 33,587 |  |  |  | 32,836 |  |  |  | 26,684 |
Basic net income per common share |  | $ | 2.91 |  |  | $ | 2.54 |  |  | $ | 2.01 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 97,707 |  |  | $ | 83,566 |  |  | $ | 53,644 |
Average common shares outstanding |  |  | 33,587 |  |  |  | 32,836 |  |  |  | 26,684 |
Adjustment for common share equivalents |  |  | 594 |  |  |  | 643 |  |  |  | 867 |
Average common shares outstanding-diluted |  |  | 34,181 |  |  |  | 33,479 |  |  |  | 27,551 |
Diluted net income per common share |  | $ | 2.86 |  |  | $ | 2.50 |  |  | $ | 1.95 |
Anti-dilutive shares |  |  | 7 |  |  |  | 5 |  |  |  | 13 |

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