Note 18 - Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Beginning balance, loss, net of tax	$ 2,474,040	$ 2,446,251
Total other comprehensive (loss)/income, net of tax	11,218	(42,912)
Ending balance, loss, net of tax	2,542,339	2,422,230
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Beginning balance, loss, net of tax	(104,832)	211
Net unrealized (losses)/gains arising during the period, pre-tax	13,552	(65,256)
Net unrealized (losses)/gains arising during the period, tax	4,006	(19,290)
Net unrealized (losses)/gains arising during the period, net of tax	9,546	(45,966)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	(3,000)	0
Reclassification adjustment for net losses/(gains) included in net income, tax	(887)	0
Reclassification adjustment for net losses/(gains) included in net income, net of tax	(2,113)	0
Total other comprehensive (loss)/income, pre-tax	16,552	(65,256)
Total other comprehensive (loss)/income, tax	4,893	(19,290)
Total other comprehensive (loss)/income, net of tax	11,659	(45,966)
Ending balance, loss, net of tax	(93,173)	(45,755)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Beginning balance, loss, net of tax	2,537	(3,276)
Net unrealized (losses)/gains arising during the period, pre-tax	(626)	4,336
Net unrealized (losses)/gains arising during the period, tax	(185)	1,282
Net unrealized (losses)/gains arising during the period, net of tax	(441)	3,054
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	(626)	4,336
Total other comprehensive (loss)/income, tax	(185)	1,282
Total other comprehensive (loss)/income, net of tax	(441)	3,054
Ending balance, loss, net of tax	2,096	(222)
AOCI Attributable to Parent [Member]
Beginning balance, loss, net of tax	(102,295)	(3,065)
Net unrealized (losses)/gains arising during the period, pre-tax	12,926	(60,920)
Net unrealized (losses)/gains arising during the period, tax	3,821	(18,008)
Net unrealized (losses)/gains arising during the period, net of tax	9,105	(42,912)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	(3,000)	0
Reclassification adjustment for net losses/(gains) included in net income, tax	(887)	0
Reclassification adjustment for net losses/(gains) included in net income, net of tax	(2,113)	0
Total other comprehensive (loss)/income, pre-tax	15,926	(60,920)
Total other comprehensive (loss)/income, tax	4,708	(18,008)
Total other comprehensive (loss)/income, net of tax	11,218	(42,912)
Ending balance, loss, net of tax	$ (91,077)	$ (45,977)