Note 8 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans By Class of Loans, Continued (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Impaired [Line Items]
Average	$ 63,669	$ 71,567	$ 64,865	$ 92,375
Interest Income Recognized	555	735	1,942	2,397
Cash Basis Interest Recognized	536	871	1,906	2,347
Real Estate Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Average	16,815	26,902	17,683	37,921
Interest Income Recognized	128	249	405	630
Cash Basis Interest Recognized	109	204	402	573
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Average	11,799	8,979	13,023	14,744
Interest Income Recognized	94	52	356	308
Cash Basis Interest Recognized	105	44	340	298
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Average	33,925	35,076	33,006	38,967
Interest Income Recognized	329	418	1,137	1,419
Cash Basis Interest Recognized	318	608	1,120	1,437
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Average	1,037	214	966	426
Interest Income Recognized	4	8	37	22
Cash Basis Interest Recognized	4	8	37	22
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Average	18	22	20	66
Interest Income Recognized	0	0	1	5
Cash Basis Interest Recognized	0	0	1	5
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Average	75	374	167	251
Interest Income Recognized	0	8	6	13
Cash Basis Interest Recognized	$ 0	$ 7	$ 6	$ 12