Note 8 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans By Class Of Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 65,252	$ 68,336
Recorded Investment With No Allowance	26,152	28,221
Recorded Investment With Allowance	36,129	35,668
Total Recorded Investment	62,281	63,889
Allowance for Loan Losses Allocated	4,994	5,143
Real Estate Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	18,422	26,831
Recorded Investment With No Allowance	10,952	12,712
Recorded Investment With Allowance	4,701	11,068
Total Recorded Investment	15,653	23,780
Allowance for Loan Losses Allocated	921	2,075
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	12,554	7,474
Recorded Investment With No Allowance	2,626	2,215
Recorded Investment With Allowance	9,805	5,259
Total Recorded Investment	12,431	7,474
Allowance for Loan Losses Allocated	1,557	1,069
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	33,285	33,491
Recorded Investment With No Allowance	12,574	13,294
Recorded Investment With Allowance	20,628	18,803
Total Recorded Investment	33,202	32,097
Allowance for Loan Losses Allocated	1,617	1,588
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	911	210
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	915	207
Total Recorded Investment	915	207
Allowance for Loan Losses Allocated	823	198
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	19	21
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	19	21
Total Recorded Investment	19	21
Allowance for Loan Losses Allocated	15	17
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	61	309
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	61	310
Total Recorded Investment	61	310
Allowance for Loan Losses Allocated	$ 61	$ 196