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Note 12 - Stockholders' Equity and Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | 2018 |  |  | 2017 |
|  | Pre-tax |  |  | Tax expense/ (benefit) |  |  | Net-of-tax |  |  | Pre-tax |  |  | Tax expense/ (benefit) |  |  | Net-of-tax |
Beginning balance, loss, net of tax |  | (In thousands) |
Securities available-for-sale |  |  |  |  |  |  |  |  |  | $ | (1,060 | ) |  |  |  |  |  |  |  |  |  | $ | (1,545 | )
Cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  | (1,451 | ) |  |  |  |  |  |  |  |  |  |  | (2,170 | )
Total |  |  |  |  |  |  |  |  |  | $ | (2,511 | ) |  |  |  |  |  |  |  |  |  | $ | (3,715 | )
Reclassification adjustment for stranded tax effects of Tax Cuts and Jobs Act (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  | - |  |  |  | 200 |  |  |  | (200 | ) |  |  | - |  |  |  | - |  |  |  | - |
Cash flow hedge derivatives |  |  | - |  |  |  | 315 |  |  |  | (315 | ) |  |  | - |  |  |  | - |  |  |  | - |
Total |  |  | - |  |  |  | 515 |  |  |  | (515 | ) |  |  | - |  |  |  | - |  |  |  | - |
Reclassification adjustment for equity securities (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  | (12,147 | ) |  |  | (3,591 | ) |  |  | (8,556 | ) |  |  | - |  |  |  | - |  |  |  | - |
Net unrealized (losses)/gains arising during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  | $ | (11,263 | ) |  | $ | (3,329 | ) |  | $ | (7,934 | ) |  | $ | 1,843 |  |  | $ | 775 |  |  | $ | 1,068 |
Cash flow hedge derivatives |  |  | 2,165 |  |  |  | 640 |  |  |  | 1,525 |  |  |  | 1,241 |  |  |  | 522 |  |  |  | 719 |
Total |  |  | (9,098 | ) |  |  | (2,689 | ) |  |  | (6,409 | ) |  |  | 3,084 |  |  |  | 1,297 |  |  |  | 1,787 |
Reclassification adjustment for net gains in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  | (22 | ) |  |  | (7 | ) |  |  | (15 | ) |  |  | (1,006 | ) |  |  | (423 | ) |  |  | (583 | )
Cash flow hedge derivatives |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total |  |  | (22 | ) |  |  | (7 | ) |  |  | (15 | ) |  |  | (1,006 | ) |  |  | (423 | ) |  |  | (583 | )
Total other comprehensive (loss)/income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  | (11,285 | ) |  |  | (3,336 | ) |  |  | (7,949 | ) |  |  | 837 |  |  |  | 352 |  |  |  | 485 |
Cash flow hedge derivatives |  |  | 2,165 |  |  |  | 640 |  |  |  | 1,525 |  |  |  | 1,241 |  |  |  | 522 |  |  |  | 719 |
Total |  | $ | (9,120 | ) |  | $ | (2,696 | ) |  | $ | (6,424 | ) |  | $ | 2,078 |  |  | $ | 874 |  |  | $ | 1,204 |
Ending balance, (loss)/gain, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  | $ | (17,765 | ) |  |  |  |  |  |  |  |  |  | $ | (1,060 | )
Cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  | (241 | ) |  |  |  |  |  |  |  |  |  |  | (1,451 | )
Total |  |  |  |  |  |  |  |  |  | $ | (18,006 | ) |  |  |  |  |  |  |  |  |  | $ | (2,511 | )
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  |  |  |  |  |  |  |  |  | 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 |  | $ | 271,885 |  |  |  |  |  |  |  |  |  |  | $ | 176,042 |  |  |  |  |  |  |  |  |  |  | $ | 175,099 |  |  |  |  |  |  |  |  |
Basic EPS, income |  | $ | 271,885 |  |  |  | 81,131,269 |  |  | $ | 3.35 |  |  | $ | 176,042 |  |  |  | 80,262,782 |  |  | $ | 2.19 |  |  | $ | 175,099 |  |  |  | 79,153,762 |  |  | $ | 2.21 |
Effect of dilutive stock options |  |  |  |  |  |  | 476,077 |  |  |  |  |  |  |  |  |  |  |  | 741,768 |  |  |  |  |  |  |  |  |  |  |  | 775,500 |  |  |  |  |
Diluted EPS, income |  | $ | 271,885 |  |  |  | 81,607,346 |  |  | $ | 3.33 |  |  | $ | 176,042 |  |  |  | 81,004,550 |  |  | $ | 2.17 |  |  | $ | 175,099 |  |  |  | 79,929,262 |  |  | $ | 2.19 |

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