Note 3 - Loans and Allowance for Loan Losses (Detail) - Age Of The Recorded Investment In Loans By Portfolio (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
30-59 Days Past Due	$ 3,200	$ 2,497
60-89 Days Past Due	1,021	4,634
Greater Than 90 Days	17,234	24,217
Total Past Due	21,455	31,348
Current	1,106,274	1,072,130
Loans	1,127,729	1,103,478	1,050,049
Commercial And Industrial [Member]
30-59 Days Past Due	870	2,233
60-89 Days Past Due	645	817
Greater Than 90 Days	510	1,308
Total Past Due	2,025	4,358
Current	393,886	379,547
Loans	395,911	383,905	344,975
Real Estate Mortgage Residential [Member]
30-59 Days Past Due	66
Greater Than 90 Days	142	239
Total Past Due	208	239
Current	37,401	36,667
Loans	37,609	36,906
Real Estate Mortgage Commercial [Member]
30-59 Days Past Due	2,264	114
60-89 Days Past Due	376	3,817
Greater Than 90 Days	12,053	18,141
Total Past Due	14,693	22,072
Current	662,731	643,502
Loans	677,424	665,574
Real Estate Construction Residential [Member]
Greater Than 90 Days	1,426	1,426
Total Past Due	1,426	1,426
Current	1,322	984
Loans	2,748	2,410
Real Estate Construction Commercial [Member]
30-59 Days Past Due		150
Greater Than 90 Days	3,103	3,103
Total Past Due	3,103	3,253
Current	4,261	4,029
Loans	7,364	7,282
Consumer And Other [Member]
Current	6,673	7,401
Loans	$ 6,673	$ 7,401	$ 4,795