Note 9 - Other Real Estate Owned (Detail) - OREO Activity (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 From Loans [Member]	Mar. 31, 2012 From Loans [Member]	Dec. 31, 2012 Beginning [Member]	Dec. 31, 2011 Beginning [Member]	Mar. 31, 2013 Ending [Member]	Mar. 31, 2012 Ending [Member]
Beginning balance	$ 52,562				$ 52,562	$ 38,157	$ 49,130	$ 41,750
Transfers from loans			1,374	7,239
Proceeds from sales	(4,067)	(2,895)
Gain (loss) on sales, net	269	(242)
Write downs and other decreases, net	(1,008)	(509)
Ending balance	$ 49,130				$ 52,562	$ 38,157	$ 49,130	$ 41,750