Note 3 - Loans (Detail) - Allowance for loan losses: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for credit losses - balance	$ 30,344	$ 27,699	$ 20,324
Provision for loan losses	21,000	21,500	21,000
Charge-offs	(21,269)	(19,450)	(14,595)
Recoveries	1,029	595	970
Allowance for credit losses - balance	$ 31,104	$ 30,344	$ 27,699