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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance | $ 1,828,539 | $ 1,747,778 | $ 1,602,888
Total other comprehensive (loss)/income, net of tax | 1,204 | 4,711 | (2,857)
Balance | 1,973,304 | 1,828,539 | 1,747,778
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |
Net unrealized (losses)/gains arising during the period, pre-tax | 1,843 | 11,603 |
Reclassification adjustment for net losses/(gains) included in net income, pre-tax | (1,006) | (4,898) |
Total other comprehensive (loss)/income, pre-tax | 837 | 6,705 |
Net unrealized (losses)/gains arising during the period, tax | 775 | 4,878 |
Reclassification adjustment for net losses/(gains) included in net income, tax | (423) | (2,059) |
Total other comprehensive (loss)/income, tax | 352 | 2,819 |
Balance | (1,545) | (5,431) |
Net unrealized (losses)/gains arising during the period, net of tax | 1,068 | 6,725 |
Reclassification adjustment for net losses/(gains) included in net income, net of tax | (583) | (2,839) |
Total other comprehensive (loss)/income, net of tax | 485 | 3,886 |
Balance | (1,060) | (1,545) | (5,431)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Net unrealized (losses)/gains arising during the period, pre-tax | 1,241 | 1,423 |
Reclassification adjustment for net losses/(gains) included in net income, pre-tax |  |  |
Total other comprehensive (loss)/income, pre-tax | 1,241 | 1,423 |
Net unrealized (losses)/gains arising during the period, tax | 522 | 598 |
Reclassification adjustment for net losses/(gains) included in net income, tax |  |  |
Total other comprehensive (loss)/income, tax | 522 | 598 |
Balance | (2,170) | (2,995) |
Net unrealized (losses)/gains arising during the period, net of tax | 719 | 825 |
Reclassification adjustment for net losses/(gains) included in net income, net of tax |  |  |
Total other comprehensive (loss)/income, net of tax | 719 | 825 |
Balance | (1,451) | (2,170) | (2,995)
AOCI Attributable to Parent [Member] |  |  |
Net unrealized (losses)/gains arising during the period, pre-tax | 3,084 | 13,026 |
Reclassification adjustment for net losses/(gains) included in net income, pre-tax | (1,006) | (4,898) |
Total other comprehensive (loss)/income, pre-tax | 2,078 | 8,128 |
Net unrealized (losses)/gains arising during the period, tax | 1,297 | 5,476 |
Reclassification adjustment for net losses/(gains) included in net income, tax | (423) | (2,059) |
Total other comprehensive (loss)/income, tax | 874 | 3,417 |
Balance | (3,715) | (8,426) | (5,569)
Net unrealized (losses)/gains arising during the period, net of tax | 1,787 | 7,550 |
Reclassification adjustment for net losses/(gains) included in net income, net of tax | (583) | (2,839) |
Total other comprehensive (loss)/income, net of tax | 1,204 | 4,711 | (2,857)
Balance | $ (2,511) | $ (3,715) | $ (8,426)

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