Note 6 - Other Real Estate Owned (Detail) - Activity in the Valuation Allowance for Other Real Estate Losses (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance, beginning of year	$ 26,422	$ 25,310	$ 22,743
Provision for losses	10,668	10,385	20,139
OREO disposal	(17,534)	(9,273)	(17,572)
Balance, end of year	$ 19,556	$ 26,422	$ 25,310