Note 5 - Fair Value Measurements (Detail) - Quantitative Information about Unobservable Inputs for Assets Measured on a Nonrecurring Basis Using Level 3 Measurements (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 Impaired Loans [Member]	Sep. 30, 2012 OREO [Member]	Sep. 30, 2012	Dec. 31, 2011
Impaired loans (in Dollars)	$ 19,829		$ 990,603	$ 1,043,824
Impaired loans	Discounted appraisals	Discounted appraisals
Impaired loans	Marketability discount	Marketability discount
Impaired loans	0.30%	0.30%
Impaired loans	12.50%	71.40%
Impaired loans	5.00%	6.80%
OREO (in Dollars)		$ 13,713
OREO	Discounted appraisals	Discounted appraisals
OREO	Marketability discount	Marketability discount
OREO	0.30%	0.30%
OREO	12.50%	71.40%
OREO	5.00%	6.80%