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Note 11 - Stockholders' Equity and Earnings Per Share - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Beginning balance, loss, net of tax | $ 2,294,283 | $ 2,121,866 | $ 1,973,304
Total other comprehensive (loss)/income, net of tax | 3,008 | 20,308 | (6,424)
Ending balance, loss, net of tax | 2,418,144 | 2,294,283 | 2,121,866
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |
Beginning balance, loss, net of tax | 5,714 | (17,765) |
Net unrealized (losses)/gains arising during the period, pre-tax | 10,903 | 33,543 |
Net unrealized (losses)/gains arising during the period, tax | 3,223 | 9,915 |
Net unrealized (losses)/gains arising during the period, net of tax | 7,680 | 23,628 |
Reclassification adjustment for net losses/(gains) included in net income, pre-tax | 1,695 | 211 |
Reclassification adjustment for net losses/(gains) included in net income, tax | 501 | 62 |
Reclassification adjustment for net losses/(gains) included in net income, net of tax | 1,194 | 149 |
Total other comprehensive (loss)/income, pre-tax | 9,208 | 33,332 |
Total other comprehensive (loss)/income, tax | 2,722 | 9,853 |
Total other comprehensive (loss)/income, net of tax | 6,486 | 23,479 |
Ending balance, loss, net of tax | 12,200 | 5,714 | (17,765)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |
Beginning balance, loss, net of tax | (3,412) | (241) |
Net unrealized (losses)/gains arising during the period, pre-tax | (4,938) | (4,502) |
Net unrealized (losses)/gains arising during the period, tax | (1,460) | (1,331) |
Net unrealized (losses)/gains arising during the period, net of tax | (3,478) | (3,171) |
Reclassification adjustment for net losses/(gains) included in net income, pre-tax | 0 | 0 |
Reclassification adjustment for net losses/(gains) included in net income, tax | 0 | 0 |
Reclassification adjustment for net losses/(gains) included in net income, net of tax | 0 | 0 |
Total other comprehensive (loss)/income, pre-tax | (4,938) | (4,502) |
Total other comprehensive (loss)/income, tax | (1,460) | (1,331) |
Total other comprehensive (loss)/income, net of tax | (3,478) | (3,171) |
Ending balance, loss, net of tax | (6,890) | (3,412) | (241)
AOCI Attributable to Parent [Member] |  |  |
Beginning balance, loss, net of tax | 2,302 | (18,006) | (2,511)
Net unrealized (losses)/gains arising during the period, pre-tax | 5,965 | 29,041 |
Net unrealized (losses)/gains arising during the period, tax | 1,763 | 8,584 |
Net unrealized (losses)/gains arising during the period, net of tax | 4,202 | 20,457 |
Reclassification adjustment for net losses/(gains) included in net income, pre-tax | 1,695 | 211 |
Reclassification adjustment for net losses/(gains) included in net income, tax | 501 | 62 |
Reclassification adjustment for net losses/(gains) included in net income, net of tax | 1,194 | 149 |
Total other comprehensive (loss)/income, pre-tax | 4,270 | 28,830 |
Total other comprehensive (loss)/income, tax | 1,262 | 8,522 |
Total other comprehensive (loss)/income, net of tax | 3,008 | 20,308 | (6,424)
Ending balance, loss, net of tax | $ 5,310 | $ 2,302 | $ (18,006)

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