Note 8 - Loans and Allowance for Loan Losses (Detail) - Individually Impaired Loans By Class of Loans, Continued (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Average	$ 66,362	$ 101,853
Interest Income Recognized	693	876
Cash Basis Interest Recognized	670	713
Real Estate Construction And Land Development [Member]
Average	25,945	35,550
Interest Income Recognized	353	108
Cash Basis Interest Recognized	342	99
Real Estate Mortgage Residential [Member]
Average	8,288	24,133
Interest Income Recognized	85	242
Cash Basis Interest Recognized	80	232
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Average	31,191	41,107
Interest Income Recognized	248	503
Cash Basis Interest Recognized	242	359
Commercial And Industrial [Member]
Average	704	765
Interest Income Recognized	4	14
Cash Basis Interest Recognized	4	14
Consumer Secured [Member]
Average	21	106
Interest Income Recognized		5
Cash Basis Interest Recognized		5
Consumer Unsecured [Member]
Average	213	192
Interest Income Recognized	3	4
Cash Basis Interest Recognized	$ 2	$ 4