Note 7 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans By Class of Loans, Continued (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Impaired [Line Items]
Average	$ 61,866	$ 66,362
Interest Income Recognized	619	693
Cash Basis Interest Recognized	599	670
Real Estate Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Average	15,623	25,945
Interest Income Recognized	113	353
Cash Basis Interest Recognized	111	342
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Average	11,713	8,288
Interest Income Recognized	115	85
Cash Basis Interest Recognized	109	80
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Average	34,193	31,191
Interest Income Recognized	386	248
Cash Basis Interest Recognized	376	242
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Average	249	704
Interest Income Recognized	1	4
Cash Basis Interest Recognized	0	4
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Average	18	21
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Average	70	213
Interest Income Recognized	4	3
Cash Basis Interest Recognized	$ 3	$ 2