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Note 19 - Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Balance |  | $ 2,199,297 | $ 2,064,836 | $ 2,121,866 | $ 1,973,304
Total other comprehensive (loss)/income, net of tax |  | 525 | (862) | 17,173 | (12,198)
Balance |  | 2,245,894 | 2,116,777 | 2,245,894 | 2,116,777
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |
Net unrealized (losses)/gains arising during the period, pre-tax |  | 1,750 | (3,603) | 30,119 | (23,854)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax |  | (121) | (14) | (108) | (14)
Total other comprehensive (loss)/income, pre-tax |  | 1,871 | (3,589) | 30,227 | (23,840)
Net unrealized (losses)/gains arising during the period, tax |  | 517 | (1,065) | 8,903 | (7,051)
Reclassification adjustment for net losses/(gains) included in net income, tax |  | (36) | (4) | (32) | (4)
Total other comprehensive (loss)/income, tax |  | 553 | (1,061) | 8,935 | (7,047)
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, tax | [1] |  |  | 0 | 200
Balance |  | 2,209 | (24,084) | (17,765) | (1,060)
Net unrealized (losses)/gains arising during the period, net of tax |  | 1,233 | (2,538) | 21,216 | (16,803)
Reclassification adjustment for net losses/(gains) included in net income, net of tax |  | (85) | (10) | (76) | (10)
Total other comprehensive (loss)/income, net of tax |  | 1,318 | (2,528) | 21,292 | (16,793)
Balance |  | 3,527 | (26,612) | 3,527 | (26,612)
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, net of tax | [1] |  |  | 0 | (200)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |
Net unrealized (losses)/gains arising during the period, pre-tax |  | (1,126) | 2,365 | (5,848) | 6,523
Reclassification adjustment for net losses/(gains) included in net income, pre-tax |  | 0 | 0 | 0 | 0
Total other comprehensive (loss)/income, pre-tax |  | (1,126) | 2,365 | (5,848) | 6,523
Net unrealized (losses)/gains arising during the period, tax |  | (333) | 699 | (1,729) | 1,928
Reclassification adjustment for net losses/(gains) included in net income, tax |  | 0 | 0 | 0 | 0
Total other comprehensive (loss)/income, tax |  | (333) | 699 | (1,729) | 1,928
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, tax | [1] |  |  | 0 | 315
Balance |  | (3,567) | 1,163 | (241) | (1,451)
Net unrealized (losses)/gains arising during the period, net of tax |  | (793) | 1,666 | (4,119) | 4,595
Reclassification adjustment for net losses/(gains) included in net income, net of tax |  | 0 | 0 | 0 | 0
Total other comprehensive (loss)/income, net of tax |  | (793) | 1,666 | (4,119) | 4,595
Balance |  | (4,360) | 2,829 | (4,360) | 2,829
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, net of tax | [1] |  |  | 0 | (315)
AOCI Attributable to Parent [Member] |  |  |  |  |
Net unrealized (losses)/gains arising during the period, pre-tax |  | 624 | (1,238) | 24,271 | (17,331)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax |  | (121) | (14) | (108) | (14)
Total other comprehensive (loss)/income, pre-tax |  | 745 | (1,224) | 24,379 | (17,317)
Reclassification adjustment for equity securities, pre-tax | [2] |  |  | 0 | (12,151)
Net unrealized (losses)/gains arising during the period, tax |  | 184 | (366) | 7,174 | (5,123)
Reclassification adjustment for net losses/(gains) included in net income, tax |  | (36) | (4) | (32) | (4)
Total other comprehensive (loss)/income, tax |  | 220 | (362) | 7,206 | (5,119)
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, tax | [1] |  |  | 0 | 515
Reclassification adjustment for equity securities, tax | [2] |  |  | 0 | (3,592)
Balance |  | (1,358) | (22,921) | (18,006) | (2,511)
Net unrealized (losses)/gains arising during the period, net of tax |  | 440 | (872) | 17,097 | (12,208)
Reclassification adjustment for net losses/(gains) included in net income, net of tax |  | (85) | (10) | (76) | (10)
Total other comprehensive (loss)/income, net of tax |  | 525 | (862) | 17,173 | (12,198)
Balance |  | $ (833) | $ (23,783) | (833) | (23,783)
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, net of tax | [1] |  |  | 0 | (515)
Reclassification adjustment for equity securities, net of tax | [2] |  |  | $ 0 | $ (8,559)
[1] | These amounts were recorded as of January 1, 2018 as a result of the adoption of ASU 2018-2.
[2] | This amount was recorded as of January 1, 2018 as a result of the adoption of ASU 2016-1.

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