Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Balance at beginning of year	$ 145,072	$ 144,808	$ 93,869
Balance at end of year	121,962	145,072	144,808
Allowance for loan losses	119,462	142,572	144,808
Reserve for unfunded commitments	2,500	2,500
Total allowance for credit losses	121,962	145,072	144,808
Loans charged-off	(111,576)	(155,330)	(168,038)
Recoveries of loans previously charged-off	7,884	8,245	3,305
Net loans charged-off	(103,692)	(147,085)	(164,733)
Provision for loan losses	$ 80,582	$ 147,349	$ 215,672