Note 7 - Loans (Details) - Impaired Loans and Related Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
With allocated allowance
Allowance	$ 13,814	$ 13,284
Total impaired loans	215,509	263,848
Total impaired loans	188,347	200,780
Total impaired loans	13,814	13,284
Commercial Loans [Member]
With allocated allowance
Loans with related allowance, unpaid principal balance	8,951	22,737
Loans with related allowance, recorded investment	6,985	13,063
Allowance	2,730	2,519
Total impaired loans	2,730	2,519
Real Estate Construction Loans [Member]
With allocated allowance
Loans with related allowance, unpaid principal balance	15,377	28,475
Loans with related allowance, recorded investment	15,377	19,323
Allowance	2,604	3,460
Total impaired loans	2,604	3,460
Commercial Mortgage Loans [Member]
With allocated allowance
Loans with related allowance, unpaid principal balance	33,749	39,223
Loans with related allowance, recorded investment	32,973	35,613
Allowance	7,999	6,584
Total impaired loans	7,999	6,584
Residential Mortgage And Equity Lines Member
With allocated allowance
Loans with related allowance, unpaid principal balance	13,422	16,535
Loans with related allowance, recorded investment	12,988	14,957
Allowance	481	721
Total impaired loans	481	721
With Allocated Allowance Member
With allocated allowance
Loans with related allowance, unpaid principal balance	71,499	106,970
Loans with related allowance, recorded investment	68,323	82,956
Allowance	13,814	13,284
Total impaired loans	13,814	13,284
Commercial Loans [Member]
With no allocated allowance
Loans with no related allowance, unpaid principal balance	19,792	20,992
Loans with no related allowance, recorded investment	18,764	18,905
Real Estate Construction Loans [Member]
With no allocated allowance
Loans with no related allowance, unpaid principal balance	37,403	25,401
Loans with no related allowance, recorded investment	16,133	15,097
Commercial Mortgage Loans [Member]
With no allocated allowance
Loans with no related allowance, unpaid principal balance	84,274	105,593
Loans with no related allowance, recorded investment	82,586	78,930
Residential Mortgage And Equity Lines Member
With no allocated allowance
Loans with no related allowance, unpaid principal balance	2,541	4,892
Loans with no related allowance, recorded investment	2,541	4,892
With No Allocated Allowance Member
With no allocated allowance
Loans with no related allowance, unpaid principal balance	144,010	156,878
Loans with no related allowance, recorded investment	$ 120,024	$ 117,824