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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Impaired [Line Items]
Average	$ 51,227	$ 63,669	$ 55,365	$ 64,865
Interest Income Recognized	693	555	1,941	1,942
Cash Basis Interest Recognized	686	536	1,893	1,906
Real Estate Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Average	13,157	16,815	14,735	17,683
Interest Income Recognized	46	128	279	405
Cash Basis Interest Recognized	46	109	275	402
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Average	10,651	11,799	11,137	13,023
Interest Income Recognized	150	94	412	356
Cash Basis Interest Recognized	143	105	393	340
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Average	27,014	33,925	29,141	33,006
Interest Income Recognized	495	329	1,240	1,137
Cash Basis Interest Recognized	495	318	1,217	1,120
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Average	375	1,037	290	966
Interest Income Recognized	2	4	6	37
Cash Basis Interest Recognized	2	4	5	37
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Average	0	18	6	20
Interest Income Recognized	0	0	0	1
Cash Basis Interest Recognized	0	0	0	1
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Average	30	75	56	167
Interest Income Recognized	0	0	4	6
Cash Basis Interest Recognized	$ 0	$ 0	$ 3	$ 6