Note 13 - Stockholders' Equity and Earnings per Share (Details) - Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income [Abstract]
Beginning balance, net of tax	$ 465
Ending balance, net of tax	(29,729)	465
Net unrealized losses arising during the period	(117,515)
Net unrealized losses arising during the period	(49,407)
Net unrealized losses arising during the period	(68,108)
Reclassification adjustment for net securities gains included in net income	27,362
Reclassification adjustment for net securities gains included in net income	11,503
Reclassification adjustment for net securities gains included in net income	15,859	10,448	12,248
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	(52,101)
Total other comprehensive income	(21,907)
Total other comprehensive income	$ (30,194)	$ 9,197	$ (7,710)