Note 16 - Stockholders' Equity (Details) - Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income [Abstract]
Beginning balance, net of tax	$ (29,729)	$ 465
Ending balance, net of tax	(22,090)	23,477
Net unrealized gains arising during the period	19,140	7,947
Net unrealized gains arising during the period	8,047	3,343
Net unrealized gains arising during the period	11,094	4,604
Reclassification adjustment for net securities gains included in net income	(5,960)	(6,292)
Reclassification adjustment for net securities gains included in net income	(2,506)	(2,645)
Reclassification adjustment for net securities gains included in net income	(3,455)	(3,647)
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale		38,052
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale		15,997
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale		22,055
Total other comprehensive income	13,180	39,707
Total other comprehensive income	5,541	16,695
Total other comprehensive income	$ 7,639	$ 23,012