Note 9 - Fair Value Measurements (Detail) - Assets measured at fair value on a nonrecurring basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value	$ 22,202	$ 26,428
Total Losses	(2,268)	(4,972)
Non-Covered Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	5,869	6,618
Non-Covered Other Real Estate Owned [Member]
Fair Value	5,869	6,618
Total Losses	(446)	(1,360)
Covered Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	8,055	7,929
Covered Other Real Estate Owned [Member]
Fair Value	8,055	7,929
Total Losses	(146)	(371)
Originated Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	2,628	3,097
Originated Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value	990	2,100
Originated Impaired Loans [Member]
Fair Value	3,618	5,197
Total Losses	(1,676)	(3,158)
Purchased Covered Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	200	2,224
Purchased Covered Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value	4,460	4,460
Purchased Covered Impaired Loans [Member]
Fair Value	4,660	6,684
Total Losses		(83)
Fair Value, Inputs, Level 2 [Member]
Fair Value	16,752	19,868
Fair Value, Inputs, Level 3 [Member]
Fair Value	$ 5,450	$ 6,560