Note 10 - Fair Value of Financial Instruments (Detail) - Fair value measured on a non-recurring basis: (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets, carried at fair value on a non-recurring basis	$ 51,785	$ 60,294
Fair Value, Inputs, Level 3 [Member] | Loans Held For Sale [Member]
Assets, carried at fair value on a non-recurring basis	9,907	5,313
Fair Value, Inputs, Level 3 [Member] | Impaired loans [Member]
Assets, carried at fair value on a non-recurring basis	39,689	49,703
Fair Value, Inputs, Level 3 [Member] | Other real estate owned [Member]
Assets, carried at fair value on a non-recurring basis	2,189	5,278
Fair Value, Inputs, Level 3 [Member]
Assets, carried at fair value on a non-recurring basis	51,785	60,294
Loans Held For Sale [Member]
Assets, carried at fair value on a non-recurring basis	9,907	5,313
Impaired loans [Member]
Assets, carried at fair value on a non-recurring basis	39,689	49,703
Other real estate owned [Member]
Assets, carried at fair value on a non-recurring basis	$ 2,189	$ 5,278