Note 6 - Fair Value Measurements (Detail) - Carrying Amount of Assets Measured at Fair Value on a Nonrecurring Basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Real Estate Construction And Land Development OREO [Member] \| Fair Value, Inputs, Level 3 [Member]
OREO
Fair Value	$ 8,922	$ 15,873
Real Estate Construction And Land Development OREO [Member]
OREO
Fair Value	8,922	15,873
Residential Real Estate OREO [Member] \| Fair Value, Inputs, Level 3 [Member]
OREO
Fair Value	682	1,483
Residential Real Estate OREO [Member]
OREO
Fair Value	682	1,483
Farmland and Other Commercial Enterprises OREO [Member] \| Fair Value, Inputs, Level 3 [Member]
OREO
Fair Value	5,086	3,826
Farmland and Other Commercial Enterprises OREO [Member]
OREO
Fair Value	5,086	3,826
Total [Member] \| Fair Value, Inputs, Level 3 [Member]
OREO
Fair Value	14,690	21,182
Total [Member]
OREO
Fair Value	14,690	21,182
Real Estate Mortgage Residential [Member] \| Fair Value, Inputs, Level 3 [Member]
Impaired Loans
Fair Value	286	2,273
Real Estate Mortgage Residential [Member]
Impaired Loans
Fair Value	286	2,273
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member] \| Fair Value, Inputs, Level 3 [Member]
Impaired Loans
Fair Value	705	3,523
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Impaired Loans
Fair Value	705	3,523
Commercial And Industrial [Member] \| Fair Value, Inputs, Level 3 [Member]
Impaired Loans
Fair Value	20	9
Commercial And Industrial [Member]
Impaired Loans
Fair Value	20	9
Total [Member] \| Fair Value, Inputs, Level 3 [Member]
Impaired Loans
Fair Value	1,011	23,843
Total [Member]
Impaired Loans
Fair Value	1,011	23,843
Real Estate Construction And Land Development [Member] \| Fair Value, Inputs, Level 3 [Member]
Impaired Loans
Fair Value		17,921
Real Estate Construction And Land Development [Member]
Impaired Loans
Fair Value		17,921
Consumer Secured [Member] \| Fair Value, Inputs, Level 3 [Member]
Impaired Loans
Fair Value		4
Consumer Secured [Member]
Impaired Loans
Fair Value		4
Consumer Unsecured [Member] \| Fair Value, Inputs, Level 3 [Member]
Impaired Loans
Fair Value		113
Consumer Unsecured [Member]
Impaired Loans
Fair Value		113
Fair Value, Inputs, Level 3 [Member]
Impaired Loans
Fair Value	$ 994,841	$ 979,301

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.

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