Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans	$ 227,236	[1],[2]	$ 293,606	[1],[2]
Consumer Loans [Member] | Other Consumer [Member]
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans	872		1,847
Consumer Loans [Member]
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans	872		1,847
Real Estate Loans [Member] | Construction Loans [Member]
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans	18,444		19,172
Real Estate Loans [Member] | Single Family Residential Loans [Member]
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans	73,313		90,795
Real Estate Loans [Member] | Other Commercial Real Estate Loans [Member]
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans	126,022		160,148
Real Estate Loans [Member]
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans	217,779		270,115
Commercial Loans [Member] | Commercial [Member]
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans	8,585		18,950
Commercial Loans [Member] | Agricultural Loans [Member]
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans			2,694
Commercial Loans [Member]
Note 5 - Loans Acquired (Details) - Carrying Value of all Acquired Impaired Loans [Line Items]
Acquired Impaired Loans	$ 8,585		$ 21,644

[1] These loans were not classified as non-performing assets at June 30, 2013 or December 31, 2012, as the loans are accounted for on a pooled basis and the pools are considered to be performing. Therefore, interest income, through accretion of the difference between the carrying amount of the loans and the expected cash flows, is being recognized on all purchased impaired loans. The loans are grouped in pools sharing common risk characteristics and were treated in the aggregate when applying various valuation techniques.

[2] Included in loans acquired were $163.7 million and $210.8 million of loans covered by FDIC loss share agreements at June 30, 2013 and December 31, 2012, respectively.