Note 5 - Loans (Details) - Activity in the Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Sep. 30, 2013	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Loan Losses
(Reversal)/provision for credit losses	$ (3,000)	$ (5,000)	$ (4,000)	$ (3,000)	$ (9,000)	$ 27,000
Transfers from reserve for off-balance sheet credit commitments					706	268
Loans charged off				(20,442)	(32,791)	(77,626)
Recoveries of charged off loans				14,009	18,127	11,407
Reserve for Off-Balance Sheet Credit Commitments [Member]
Allowance for Loan Losses
(Reversal)/provision for credit losses					(706)	(268)
Reserve for Off-Balance Sheet Credit Commitments [Member] | Beginning of Period [Member]
Allowance for Loan Losses
Balance				1,363	2,069	2,337
Reserve for Off-Balance Sheet Credit Commitments [Member] | End of Period [Member]
Allowance for Loan Losses
Balance				1,363	1,363	2,069
Beginning of Period [Member]
Allowance for Loan Losses
Balance				183,322	206,280	245,231
End of Period [Member]
Allowance for Loan Losses
Balance				$ 173,889	$ 183,322	$ 206,280