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Note 12 - Stockholders' Equity and Earnings Per Share - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance |  | $ 1,973,304 | $ 1,828,539 | $ 1,747,778
Total other comprehensive (loss)/income, net of tax |  | (6,424) | 1,204 | 4,711
Balance |  | 2,121,866 | 1,973,304 | 1,828,539
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |
Reclassification adjustment for equity securities, before tax | [1] | (12,147) |  |
Reclassification adjustment for net losses/(gains) included in net income, pre-tax |  | (11,263) | 1,843 |
Total other comprehensive (loss)/income, pre-tax |  | (22) | (1,006) |
Securities available-for-sale |  | (11,285) | 837 |
Reclassification adjustment for stranded tax effects of Tax Cuts and Jobs Act, tax |  | 200 |  |
Reclassification adjustment for equity securities, tax |  | (3,591) |  |
Reclassification adjustment for net losses/(gains) included in net income, tax |  | (3,329) | 775 |
Total other comprehensive (loss)/income, tax |  | (7) | (423) |
Securities available-for-sale |  | (3,336) | 352 |
Balance |  | (1,060) | (1,545) |
Reclassification adjustment for stranded tax effects of Tax Cuts and Jobs Act | [2] | (200) |  |
Reclassification adjustment for equity securities, after tax |  | (8,556) |  |
Net unrealized (losses)/gains arising during the period, net of tax |  | 7,934 | (1,068) |
Reclassification adjustment for net losses/(gains) included in net income, net of tax |  | (15) | (583) |
Total other comprehensive (loss)/income, net of tax |  | (7,949) | 485 |
Balance |  | (17,765) | (1,060) | (1,545)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |
Reclassification adjustment for net losses/(gains) included in net income, pre-tax |  | 2,165 | 1,241 |
Total other comprehensive (loss)/income, pre-tax |  |  |  |
Securities available-for-sale |  | 2,165 | 1,241 |
Reclassification adjustment for stranded tax effects of Tax Cuts and Jobs Act, tax |  | 315 |  |
Reclassification adjustment for net losses/(gains) included in net income, tax |  | 640 | 522 |
Total other comprehensive (loss)/income, tax |  |  |  |
Securities available-for-sale |  | 640 | 522 |
Balance |  | (1,451) | (2,170) |
Reclassification adjustment for stranded tax effects of Tax Cuts and Jobs Act | [2] | (315) |  |
Net unrealized (losses)/gains arising during the period, net of tax |  | (1,525) | (719) |
Reclassification adjustment for net losses/(gains) included in net income, net of tax |  |  |  |
Total other comprehensive (loss)/income, net of tax |  | 1,525 | 719 |
Balance |  | (241) | (1,451) | (2,170)
AOCI Attributable to Parent [Member] |  |  |  |
Reclassification adjustment for net losses/(gains) included in net income, pre-tax |  | (9,098) | 3,084 |
Total other comprehensive (loss)/income, pre-tax |  | (22) | (1,006) |
Securities available-for-sale |  | (9,120) | 2,078 |
Reclassification adjustment for stranded tax effects of Tax Cuts and Jobs Act, tax |  | 515 |  |
Reclassification adjustment for net losses/(gains) included in net income, tax |  | (2,689) | 1,297 |
Total other comprehensive (loss)/income, tax |  | (7) | (423) |
Securities available-for-sale |  | (2,696) | 874 |
Balance |  | (2,511) | (3,715) | (8,426)
Reclassification adjustment for stranded tax effects of Tax Cuts and Jobs Act |  | (515) |  |
Net unrealized (losses)/gains arising during the period, net of tax |  | 6,409 | (1,787) |
Reclassification adjustment for net losses/(gains) included in net income, net of tax |  | (15) | (583) |
Total other comprehensive (loss)/income, net of tax |  | (6,424) | 1,204 | 4,711
Balance |  | $ (18,006) | $ (2,511) | $ (3,715)
[1] | This amount was recorded as of January 1, 2018 as a result of the adoption of ASU 2016-1.
[2] | These amounts were recorded as of January 1, 2018 as a result of the adoption of ASU 2018-2.

X
- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings due to the adoption of ASU 2016-01. + References No definition available. + Details
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