Note 4 - Loans and Allowance for Loan Losses (Detail) - Loans for which a payment default occurred, and that has been modified as a TDR within 12 months or less of the payment default, excluding loans acquired (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Real estate:
Number of Loans	2	1	2	6
Recorded Balance at September 30	$ 7	$ 724	$ 7	$ 4,092
Charge-offs	125	556	125	559
Transfers to OREO			4,321	18,247
Loans For Which a Payment Default Occured and Had Been Modified as a TDR Within 12 Months Or Less of the Payment Default [Member]
Real estate:
Transfers to OREO	473		473
Other Commercial Real Estate Loans [Member]
Real estate:
Number of Loans	1	1	1	5
Recorded Balance at September 30		724		4,057
Charge-offs		556		556
Real Estate Loans [Member]
Real estate:
Number of Loans	1	1	1	5
Recorded Balance at September 30		724		4,057
Charge-offs		556		556
Other Commercial Loans [Member]
Real estate:
Number of Loans	1		1	1
Recorded Balance at September 30	7		7	35
Charge-offs	125		125	3
Commercial Loans [Member]
Real estate:
Number of Loans	1		1	1
Recorded Balance at September 30	7		7	35
Charge-offs	$ 125		$ 125	$ 3