Note 5 - Loans (Details) - Allowance for loan losses: (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allowance for loan losses: [Abstract]
Balance	$ 32,355	$ 30,899	$ 31,104	$ 30,344
Provision for loan losses	3,435	5,000	12,935	16,000
Charge-off's	(5,186)	(5,641)	(14,074)	(16,524)
Recoveries	212	429	851	867
Balance	$ 30,816	$ 30,687	$ 30,816	$ 30,687