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Note 11 - Stockholders' Equity and Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | 2020 |  |  | 2019 |
|  | 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 |  |  |  |  |  |  |  |  |  | $ | 5,714 |  |  |  |  |  |  |  |  |  |  | $ | (17,765 | )
Cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  | (3,412 | ) |  |  |  |  |  |  |  |  |  |  | (241 | )
Total |  |  |  |  |  |  |  |  |  | $ | 2,302 |  |  |  |  |  |  |  |  |  |  | $ | (18,006 | )
Net unrealized gains/(losses) arising during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  | $ | 10,903 |  |  | $ | 3,223 |  |  | $ | 7,680 |  |  | $ | 33,543 |  |  | $ | 9,915 |  |  | $ | 23,628 |
Cash flow hedge derivatives |  |  | (4,938 | ) |  |  | (1,460 | ) |  |  | (3,478 | ) |  |  | (4,502 | ) |  |  | (1,331 | ) |  |  | (3,171 | )
Total |  |  | 5,965 |  |  |  | 1,763 |  |  |  | 4,202 |  |  |  | 29,041 |  |  |  | 8,584 |  |  |  | 20,457 |
Reclassification adjustment for net gains in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  | (1,695 | ) |  |  | (501 | ) |  |  | (1,194 | ) |  |  | (211 | ) |  |  | (62 | ) |  |  | (149 | )
Cash flow hedge derivatives |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  |  | (1,695 | ) |  |  | (501 | ) |  |  | (1,194 | ) |  |  | (211 | ) |  |  | (62 | ) |  |  | (149 | )
Total other comprehensive income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  | 9,208 |  |  |  | 2,722 |  |  |  | 6,486 |  |  |  | 33,332 |  |  |  | 9,853 |  |  |  | 23,479 |
Cash flow hedge derivatives |  |  | (4,938 | ) |  |  | (1,460 | ) |  |  | (3,478 | ) |  |  | (4,502 | ) |  |  | (1,331 | ) |  |  | (3,171 | )
Total |  | $ | 4,270 |  |  | $ | 1,262 |  |  | $ | 3,008 |  |  | $ | 28,830 |  |  | $ | 8,522 |  |  | $ | 20,308 |
Ending balance, gain/(loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  | $ | 12,200 |  |  |  |  |  |  |  |  |  |  | $ | 5,714 |
Cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  | (6,890 | ) |  |  |  |  |  |  |  |  |  |  | (3,412 | )
Total |  |  |  |  |  |  |  |  |  | $ | 5,310 |  |  |  |  |  |  |  |  |  |  | $ | 2,302 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  |  |  |  |  |  |  |  |  | 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 |  | $ | 228,860 |  |  |  |  |  |  |  |  |  |  | $ | 279,135 |  |  |  |  |  |  |  |  |  |  | $ | 271,885 |  |  |  |  |  |  |  |  |
Basic EPS, income |  | $ | 228,860 |  |  |  | 79,584,560 |  |  | $ | 2.88 |  |  | $ | 279,135 |  |  |  | 79,999,703 |  |  | $ | 3.49 |  |  | $ | 271,885 |  |  |  | 81,131,269 |  |  | $ | 3.35 |
Effect of dilutive stock options and RSU |  |  |  |  |  |  | 193,287 |  |  |  |  |  |  |  |  |  |  |  | 248,190 |  |  |  |  |  |  |  |  |  |  |  | 476,077 |  |  |  |  |
Diluted EPS, income |  | $ | 228,860 |  |  |  | 79,777,847 |  |  | $ | 2.87 |  |  | $ | 279,135 |  |  |  | 80,247,893 |  |  | $ | 3.48 |  |  | $ | 271,885 |  |  |  | 81,607,346 |  |  | $ | 3.33 |

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