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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financing Receivable, Impaired [Line Items]
Average	$ 53,119	$ 64,594	$ 57,468	$ 65,473
Interest Income Recognized	629	694	1,248	1,387
Cash Basis Interest Recognized	608	700	1,207	1,370
Real Estate Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Average	15,452	24,159	15,537	25,047
Interest Income Recognized	120	338	233	691
Cash Basis Interest Recognized	118	347	229	689
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Average	11,059	10,836	11,384	9,569
Interest Income Recognized	147	87	262	172
Cash Basis Interest Recognized	141	83	250	163
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Average	26,295	28,209	30,222	29,692
Interest Income Recognized	359	236	745	484
Cash Basis Interest Recognized	346	236	722	478
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Average	245	1,154	247	930
Interest Income Recognized	3	29	4	33
Cash Basis Interest Recognized	3	29	3	33
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Average	0	21	9	21
Interest Income Recognized	0	1	0	1
Cash Basis Interest Recognized	0	1	0	1
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Average	68	215	69	214
Interest Income Recognized	0	3	4	6
Cash Basis Interest Recognized	$ 0	$ 4	$ 3	$ 6