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Note 12 - Stockholders' Equity and Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | 201 7 |  |  | 201 6 |
|  | Pre-ta x |  |  | Tax expense/ (Benefit ) |  |  | Net-of-ta x |  |  | Pre-ta x |  |  | Tax expense/ (Benefit ) |  |  | Net-of-ta x |
Beginning balance, loss, net of ta x |  | (In thousands ) |
Securities available-for-sal e |  |  |  |  |  |  |  |  |  | $ | (1,545 | ) |  |  |  |  |  |  |  |  |  | $ | (5,431 | )
Cash flow hedge derivative s |  |  |  |  |  |  |  |  |  |  | (2,170 | ) |  |  |  |  |  |  |  |  |  |  | (2,995 | )
Tota l |  |  |  |  |  |  |  |  |  | $ | (3,715 | ) |  |  |  |  |  |  |  |  |  | $ | (8,426 | )
Net unrealized gains arising during the perio d |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sal e |  | $ | 1,843 |  |  | $ | 775 |  |  | $ | 1,068 |  |  | $ | 11,603 |  |  | $ | 4,878 |  |  | $ | 6,725 |
Cash flow hedge derivative s |  |  | 1,241 |  |  |  | 522 |  |  |  | 719 |  |  |  | 1,423 |  |  |  | 598 |  |  |  | 825 |
Tota l |  |  | 3,084 |  |  |  | 1,297 |  |  |  | 1,787 |  |  |  | 13,026 |  |  |  | 5,476 |  |  |  | 7,550 |
Reclassification adjustment for net gains included in net incom e |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sal e |  |  | (1,006 | ) |  |  | (423 | ) |  |  | (583 | ) |  |  | (4,898 | ) |  |  | (2,059 | ) |  |  | (2,839 | )
Cash flow hedge derivative s |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Tota l |  |  | (1,006 | ) |  |  | (423 | ) |  |  | (583 | ) |  |  | (4,898 | ) |  |  | (2,059 | ) |  |  | (2,839 | )
Total other comprehensive incom e |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sal e |  |  | 837 |  |  |  | 352 |  |  |  | 485 |  |  |  | 6,705 |  |  |  | 2,819 |  |  |  | 3,886 |
Cash flow hedge derivative s |  |  | 1,241 |  |  |  | 522 |  |  |  | 719 |  |  |  | 1,423 |  |  |  | 598 |  |  |  | 825 |
Tota l |  | $ | 2,078 |  |  | $ | 874 |  |  | $ | 1,204 |  |  | $ | 8,128 |  |  | $ | 3,417 |  |  | $ | 4,711 |
Ending balance, loss, net of ta x |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for sal e |  |  |  |  |  |  |  |  |  | $ | (1,060 | ) |  |  |  |  |  |  |  |  |  | $ | (1,545 | )
Cash flow hedge derivative s |  |  |  |  |  |  |  |  |  |  | (1,451 | ) |  |  |  |  |  |  |  |  |  |  | (2,170 | )
Tota l |  |  |  |  |  |  |  |  |  | $ | (2,511 | ) |  |  |  |  |  |  |  |  |  | $ | (3,715 | )
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
|  |  |  |  |  |  |  |  |  | Pe r |  |  |  |  |  |  |  |  |  |  | Pe r |  |  |  |  |  |  |  |  |  |  | Pe r |
|  | Incom e |  |  | Share s |  |  | Shar e |  |  | Incom e |  |  | Share s |  |  | Shar e |  |  | Incom e |  |  | Share s |  |  | Shar e |
|  | (Numerator ) |  |  | (Denominator ) |  |  | Amoun t |  |  | (Numerator ) |  |  | (Denominator ) |  |  | Amoun t |  |  | (Numerator ) |  |  | (Denominator ) |  |  | Amoun t |
|  | (In thousands, except shares and per share data ) |
Net incom e |  | $ | 176,042 |  |  |  |  |  |  |  |  |  |  | $ | 175,099 |  |  |  |  |  |  |  |  |  |  | $ | 161,109 |  |  |  |  |  |  |  |  |
Basic EPS, incom e |  | $ | 176,042 |  |  |  | 80,262,782 |  |  | $ | 2.19 |  |  | $ | 175,099 |  |  |  | 79,153,762 |  |  | $ | 2.21 |  |  | $ | 161,109 |  |  |  | 80,563,577 |  |  | $ | 2.00 |
Effect of dilutive stock option s |  |  |  |  |  |  | 741,768 |  |  |  |  |  |  |  |  |  |  |  | 775,500 |  |  |  |  |  |  |  |  |  |  |  | 731,219 |  |  |  |  |
Diluted EPS, incom e |  | $ | 176,042 |  |  |  | 81,004,550 |  |  | $ | 2.17 |  |  | $ | 175,099 |  |  |  | 79,929,262 |  |  | $ | 2.19 |  |  | $ | 161,109 |  |  |  | 81,294,796 |  |  | $ | 1.98 |

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