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Note 13 - Stockholders' Equity and Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | 2015 |  |  | 2014 |
|  | Pre-tax |  |  | Tax expense/ (Benefit) |  |  | Net-of-tax |  |  | Pre-tax |  |  | Tax expense/ (Benefit) |  |  | Net-of-tax |
|  | (In thousands) |
Beginning balance, loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  | $ | (3,172 | ) |  |  |  |  |  |  |  |  |  | $ | (29,729 | )
Cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  | (2,397 | ) |  |  |  |  |  |  |  |  |  |  | - |
Total |  |  |  |  |  |  |  |  |  | $ | (5,569 | ) |  |  |  |  |  |  |  |  |  | $ | (29,729 | )
Net unrealized (losses)/gains arising during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  | $ | (7,247 | ) |  | $ | (3,047 | ) |  | $ | (4,200 | ) |  | $ | 52,573 |  |  | $ | 22,105 |  |  | $ | 30,468 |
Cash flow hedge derivatives |  |  | (1,032 | ) |  |  | (434 | ) |  |  | (598 | ) |  |  | (4,136 | ) |  |  | (1,739 | ) |  |  | (2,397 | )
Total |  |  | (8,279 | ) |  |  | (3,481 | ) |  |  | (4,798 | ) |  |  | 48,437 |  |  |  | 20,366 |  |  |  | 28,071 |
Reclassification adjustment for net losses/(gains) included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  | 3,349 |  |  |  | 1,408 |  |  |  | 1,941 |  |  |  | (6,748 | ) |  |  | (2,837 | ) |  |  | (3,911 | )
Cash flow hedge derivatives |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total |  |  | 3,349 |  |  |  | 1,408 |  |  |  | 1,941 |  |  |  | (6,748 | ) |  |  | (2,837 | ) |  |  | (3,911 | )
Total other comprehensive (loss)/income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  | (3,898 | ) |  |  | (1,639 | ) |  |  | (2,259 | ) |  |  | 45,825 |  |  |  | 19,268 |  |  |  | 26,557 |
Cash flow hedge derivatives |  |  | (1,032 | ) |  |  | (434 | ) |  |  | (598 | ) |  |  | (4,136 | ) |  |  | (1,739 | ) |  |  | (2,397 | )
Total |  | $ | (4,930 | ) |  | $ | (2,073 | ) |  | $ | (2,857 | ) |  | $ | 41,689 |  |  | $ | 17,529 |  |  | $ | 24,160 |
Ending balance, loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for sale |  |  |  |  |  |  |  |  |  | $ | (5,431 | ) |  |  |  |  |  |  |  |  |  | $ | (3,172 | )
Cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  | (2,995 | ) |  |  |  |  |  |  |  |  |  |  | (2,397 | )
Total |  |  |  |  |  |  |  |  |  | $ | (8,426 | ) |  |  |  |  |  |  |  |  |  | $ | (5,569 | )
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  |  |  |  |  |  |  |  |  | Per |  |  |  |  |  |  |  |  |  |  | Per |  |  |  |  |  |  |  |  |  |  | Per |
|  | Income |  |  | Shares |  |  | Share |  |  | Income |  |  | Shares |  |  | Share |  |  | Income |  |  | Shares |  |  | Share |
|  | (Numerator) |  |  | (Denominator) |  |  | Amount |  |  | (Numerator) |  |  | (Denominator) |  |  | Amount |  |  | (Numerator) |  |  | (Denominator) |  |  | Amount |
|  | (In thousands, except shares and per share data) |
Net income |  | $ | 161,109 |  |  |  |  |  |  |  |  |  |  | $ | 137,830 |  |  |  |  |  |  |  |  |  |  | $ | 123,143 |  |  |  |  |  |  |  |  |
Dividends on preferred stock |  |  | - |  |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |  |  |  | (9,685 | ) |  |  |  |  |  |  |  |
Basic EPS, income |  | $ | 161,109 |  |  |  | 80,563,577 |  |  | $ | 2.00 |  |  | $ | 137,830 |  |  |  | 79,661,571 |  |  | $ | 1.73 |  |  | $ | 113,458 |  |  |  | 78,954,898 |  |  | $ | 1.44 |
Effect of dilutive stock options |  |  |  |  |  |  | 731,219 |  |  |  |  |  |  |  |  |  |  |  | 445,324 |  |  |  |  |  |  |  |  |  |  |  | 183,085 |  |  |  |  |
Diluted EPS, income |  | $ | 161,109 |  |  |  | 81,294,796 |  |  | $ | 1.98 |  |  | $ | 137,830 |  |  |  | 80,106,895 |  |  | $ | 1.72 |  |  | $ | 113,458 |  |  |  | 79,137,983 |  |  | $ | 1.43 |

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