Note 7 - Loans (Details) - Impaired Loans and Related Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
With allocated allowance
Allowance	$ 9,609	$ 13,284
Total impaired loans	216,682	263,848
Total impaired loans	188,709	200,780
Total impaired loans	9,609	13,284
Commercial Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	10,725	22,737
Loans with related allowance recorded investment	7,700	13,063
Allowance	2,717	2,519
Total impaired loans	2,717	2,519
Real Estate Construction Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	15,503	28,475
Loans with related allowance recorded investment	15,503	19,323
Allowance	143	3,460
Total impaired loans	143	3,460
Commercial Mortgage Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	33,411	39,223
Loans with related allowance recorded investment	33,149	35,613
Allowance	6,230	6,584
Total impaired loans	6,230	6,584
Residential Mortgage And Equity Lines Member
With allocated allowance
Loans with related allowance unpaid principal balance	14,077	16,535
Loans with related allowance recorded investment	13,675	14,957
Allowance	519	721
Total impaired loans	519	721
With Allocated Allowance Member
With allocated allowance
Loans with related allowance unpaid principal balance	73,716	106,970
Loans with related allowance recorded investment	70,027	82,956
Allowance	9,609	13,284
Total impaired loans	9,609	13,284
Commercial Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	20,298	20,992
Loans with no related allowance recorded investment	19,271	18,905
Real Estate Construction Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	37,494	25,401
Loans with no related allowance recorded investment	16,225	15,097
Commercial Mortgage Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	82,090	105,593
Loans with no related allowance recorded investment	80,102	78,930
Residential Mortgage And Equity Lines Member
With no allocated allowance
Loans with no related allowance unpaid principal balance	3,084	4,892
Loans with no related allowance recorded investment	3,084	4,892
With No Allocated Allowance Member
With no allocated allowance
Loans with no related allowance unpaid principal balance	142,966	156,878
Loans with no related allowance recorded investment	$ 118,682	$ 117,824