Note 8 - Loans and Allowance for Loan Losses (Details) - Individually Impaired Loans By Class Of Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 64,351	$ 68,336
Recorded Investment With No Allowance	23,819	28,221
Recorded Investment With Allowance	37,671	35,668
Total Recorded Investment	61,490	63,889
Allowance for Loan Losses Allocated	5,344	5,143
Real Estate Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	26,194	26,831
Recorded Investment With No Allowance	11,290	12,712
Recorded Investment With Allowance	12,212	11,068
Total Recorded Investment	23,502	23,780
Allowance for Loan Losses Allocated	1,883	2,075
Real Estate Mortgage Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	10,127	7,474
Recorded Investment With No Allowance	2,199	2,215
Recorded Investment With Allowance	7,889	5,259
Total Recorded Investment	10,088	7,474
Allowance for Loan Losses Allocated	1,063	1,069
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	26,822	33,491
Recorded Investment With No Allowance	10,330	13,294
Recorded Investment With Allowance	16,358	18,803
Total Recorded Investment	26,688	32,097
Allowance for Loan Losses Allocated	1,388	1,588
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	976	210
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	979	207
Total Recorded Investment	979	207
Allowance for Loan Losses Allocated	892	198
Consumer Secured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	20	21
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	20	21
Total Recorded Investment	20	21
Allowance for Loan Losses Allocated	16	17
Consumer Unsecured [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	212	309
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	213	310
Total Recorded Investment	213	310
Allowance for Loan Losses Allocated	$ 102	$ 196