Note 16 - Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Beginning balance, loss, net of tax	$ 1,828,539
Ending balance, loss, net of tax	1,857,902
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance, loss, net of tax	(1,545)	$ (5,431)
Net unrealized (losses)/gains arising during the period, pre-tax	(856)	17,863
Net unrealized (losses)/gains arising during the period, tax	(360)	7,509
Net unrealized (losses)/gains arising during the period, net of tax	(496)	10,354
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	466	206
Reclassification adjustment for net losses/(gains) included in net income, tax	196	87
Reclassification adjustment for net losses/(gains) included in net income, net of tax	270	119
Total other comprehensive (loss)/income, pre-tax	(390)	18,069
Total other comprehensive (loss)/income, tax	(164)	7,596
Total other comprehensive (loss)/income, net of tax	(226)	10,473
Ending balance, loss, net of tax	(1,771)	5,042
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Beginning balance, loss, net of tax	(2,170)	(2,995)
Net unrealized (losses)/gains arising during the period, pre-tax	516	(5,383)
Net unrealized (losses)/gains arising during the period, tax	217	(2,263)
Net unrealized (losses)/gains arising during the period, net of tax	299	(3,120)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax
Reclassification adjustment for net losses/(gains) included in net income, tax
Reclassification adjustment for net losses/(gains) included in net income, net of tax
Total other comprehensive (loss)/income, pre-tax	516	(5,383)
Total other comprehensive (loss)/income, tax	217	(2,263)
Total other comprehensive (loss)/income, net of tax	299	(3,120)
Ending balance, loss, net of tax	(1,871)	(6,115)
AOCI Attributable to Parent [Member]
Beginning balance, loss, net of tax	(3,715)	(8,426)
Net unrealized (losses)/gains arising during the period, pre-tax	(340)	12,480
Net unrealized (losses)/gains arising during the period, tax	(143)	5,246
Net unrealized (losses)/gains arising during the period, net of tax	(197)	7,234
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	466	206
Reclassification adjustment for net losses/(gains) included in net income, tax	196	87
Reclassification adjustment for net losses/(gains) included in net income, net of tax	270	119
Total other comprehensive (loss)/income, pre-tax	126	12,686
Total other comprehensive (loss)/income, tax	53	5,333
Total other comprehensive (loss)/income, net of tax	73	7,353
Ending balance, loss, net of tax	$ (3,642)	$ (1,073)