Note 7 - Loans and Allowance for Loan Losses (Detail) - The Following Tables Present The Recorded Investment In Nonperforming Loans By Class Of Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Real Estate Construction And Land Development [Member]
Nonaccrual	$ 16,652	$ 30,744
Restructured Loans	8,736	6,207
Loans Past Due 90 Days Or More And Still Accruing	28
Real Estate Mortgage Residential [Member]
Nonaccrual	8,891	14,578
Restructured Loans	717	4,894
Real Estate Mortgage Farmland And Other Commercial Enterprises [Member]
Nonaccrual	16,778	13,831
Restructured Loans	16,996	8,024
Commercial And Industrial [Member]
Nonaccrual	645	386
Lease Financing [Member]
Nonaccrual	162	124
Consumer Secured [Member]
Nonaccrual	21	80
Consumer Unsecured [Member]
Nonaccrual	1	12
Loans Past Due 90 Days Or More And Still Accruing		1
Total [Member]
Nonaccrual	43,150	59,755
Restructured Loans	26,449	19,125
Loans Past Due 90 Days Or More And Still Accruing	$ 28	$ 1