Note 5 - Fair Value Measurements (Detail) - Quantitative Information about Unobservable Inputs for Assets Measured on a Nonrecurring Basis Using Level 3 Measurements (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Impaired Loans [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 OREO [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member]
Impaired loans (in Dollars)			$ 27,959		$ 1,009,964	$ 1,043,824
Impaired loans			Discounted appraisals	Discounted appraisals
Impaired loans			Marketability discount	Marketability discount
Impaired loans			0.30%	0.30%
Impaired loans			53.90%	27.40%
Impaired loans			6.60%	8.60%
OREO (in Dollars)	$ 7,553	$ 14,828		$ 7,553	$ 7,553	$ 14,828
OREO			Discounted appraisals	Discounted appraisals
OREO			Marketability discount	Marketability discount
OREO			0.30%	0.30%
OREO			53.90%	27.40%
OREO			6.60%	8.60%