Note 7 - Loans (Details) - Impaired Loans and Related Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
With allocated allowance
Allowance	$ 14,495	$ 13,284
Total impaired loans	222,684	263,848
Total impaired loans	189,311	200,780
Total impaired loans	14,495	13,284
Commercial Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	14,001	20,992
Loans with no related allowance recorded investment	11,914	18,905
Real Estate Construction Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	25,157	25,401
Loans with no related allowance recorded investment	14,854	15,097
Commercial Mortgage Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	73,274	105,593
Loans with no related allowance recorded investment	71,934	78,930
Residential Mortgage And Equity Lines Member
With no allocated allowance
Loans with no related allowance unpaid principal balance	4,876	4,892
Loans with no related allowance recorded investment	4,876	4,892
With No Allocated Allowance Member
With no allocated allowance
Loans with no related allowance unpaid principal balance	117,308	156,878
Loans with no related allowance recorded investment	103,578	117,824
Commercial Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	27,772	22,737
Loans with related allowance recorded investment	18,099	13,063
Allowance	4,663	2,519
Total impaired loans	4,663	2,519
Real Estate Construction Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	28,158	28,475
Loans with related allowance recorded investment	19,005	19,323
Allowance	3,129	3,460
Total impaired loans	3,129	3,460
Commercial Mortgage Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	35,363	39,223
Loans with related allowance recorded investment	34,979	35,613
Allowance	6,165	6,584
Total impaired loans	6,165	6,584
Residential Mortgage And Equity Lines Member
With allocated allowance
Loans with related allowance unpaid principal balance	14,083	16,535
Loans with related allowance recorded investment	13,650	14,957
Allowance	538	721
Total impaired loans	538	721
With Allocated Allowance Member
With allocated allowance
Loans with related allowance unpaid principal balance	105,376	106,970
Loans with related allowance recorded investment	85,733	82,956
Allowance	14,495	13,284
Total impaired loans	$ 14,495	$ 13,284