Note 13 - Stockholders' Equity and Earnings Per Share- Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Beginning balance, loss, net of tax	$ 2,446,251	$ 2,418,144	$ 2,294,283
Total other comprehensive (loss)/income, net of tax	(99,230)	(8,375)	3,008
Ending balance, loss, net of tax	2,474,040	2,446,251	2,418,144
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Beginning balance, loss, net of tax	211	12,200
Net unrealized (losses)/gains arising during the period, pre-tax	(149,124)	(16,167)
Net unrealized (losses)/gains arising during the period, tax	(44,081)	(4,779)
Net unrealized (losses)/gains arising during the period, net of tax	(105,043)	(11,388)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	0	853
Reclassification adjustment for net losses/(gains) included in net income, tax	0	252
Reclassification adjustment for net losses/(gains) included in net income, net of tax	0	601
Total other comprehensive (loss)/income, pre-tax	(149,124)	(17,020)
Total other comprehensive (loss)/income, tax	(44,081)	(5,031)
Total other comprehensive (loss)/income, net of tax	(105,043)	(11,989)
Ending balance, loss, net of tax	(104,832)	211	12,200
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Beginning balance, loss, net of tax	(3,276)	(6,890)
Net unrealized (losses)/gains arising during the period, pre-tax	10,864	5,131
Net unrealized (losses)/gains arising during the period, tax	3,211	1,517
Net unrealized (losses)/gains arising during the period, net of tax	7,653	3,614
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	2,612	0
Reclassification adjustment for net losses/(gains) included in net income, tax	772	0
Reclassification adjustment for net losses/(gains) included in net income, net of tax	1,840	0
Total other comprehensive (loss)/income, pre-tax	8,252	5,131
Total other comprehensive (loss)/income, tax	2,439	1,517
Total other comprehensive (loss)/income, net of tax	5,813	3,614
Ending balance, loss, net of tax	2,537	(3,276)	(6,890)
AOCI Attributable to Parent [Member]
Beginning balance, loss, net of tax	(3,065)	5,310	2,302
Net unrealized (losses)/gains arising during the period, pre-tax	(138,260)	(11,036)
Net unrealized (losses)/gains arising during the period, tax	(40,870)	(3,262)
Net unrealized (losses)/gains arising during the period, net of tax	(97,390)	(7,774)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	2,612	853
Reclassification adjustment for net losses/(gains) included in net income, tax	772	252
Reclassification adjustment for net losses/(gains) included in net income, net of tax	1,840	601
Total other comprehensive (loss)/income, pre-tax	(140,872)	(11,889)
Total other comprehensive (loss)/income, tax	(41,642)	(3,514)
Total other comprehensive (loss)/income, net of tax	(99,230)	(8,375)	3,008
Ending balance, loss, net of tax	$ (102,295)	$ (3,065)	$ 5,310