Note 3 - Loans (Detail) - Recorded Investment In Loans By Credit Risk Profile (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Grade	$ 1,100,060	$ 1,048,006	$ 1,062,565
Commercial And Industrial [Member] | Pass [Member]
Grade	351,931	310,626
Commercial And Industrial [Member] | Special Mention [Member]
Grade	3,977	10,735
Commercial And Industrial [Member] | Substandard [Member]
Grade	21,401	24,204
Commercial And Industrial [Member]
Grade	377,309	345,565	346,254
Real Estate Mortgage [Member] | Pass [Member]
Grade	610,745	551,496
Real Estate Mortgage [Member] | Special Mention [Member]
Grade	14,679	30,491
Real Estate Mortgage [Member] | Substandard [Member]
Grade	82,697	106,160
Real Estate Mortgage [Member] | Doubtful [Member]
Grade		205
Real Estate Mortgage [Member]
Grade	708,121	688,352	705,757
Real Estate Construction [Member] | Pass [Member]
Grade	2,415	3,078
Real Estate Construction [Member] | Substandard [Member]
Grade	5,492	7,257
Real Estate Construction [Member]
Grade	7,907	10,335	6,925
Consumer And Other [Member] | Pass [Member]
Grade	6,722	3,753
Consumer And Other [Member] | Substandard [Member]
Grade	1	1
Consumer And Other [Member]
Grade	6,723	3,754	3,629
Total Loans [Member] | Pass [Member]
Grade	971,813	868,953
Total Loans [Member] | Special Mention [Member]
Grade	18,656	41,226
Total Loans [Member] | Substandard [Member]
Grade	109,591	137,622
Total Loans [Member] | Doubtful [Member]
Grade		205
Total Loans [Member]
Grade	$ 1,100,060	$ 1,048,006