Note 7 - Loans (Details) - Impaired Loans and Related Allowance For Credit Losses (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
With allocated allowance
Allowance	$ 12,779	$ 12,183
Total impaired loans	276,596	323,786
Total impaired loans	211,077	248,597
Total impaired loans	12,779	12,183
Commercial Loans Member
With allocated allowance
Loans with related allowance unpaid principal balance	11,602	7,804
Loans with related allowance recorded investment	6,928	4,959
Allowance	1,568	1,467
Total impaired loans	1,568	1,467
Real Estate Construction Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	27,789	54,718
Loans with related allowance recorded investment	18,636	34,856
Allowance	4,995	8,158
Total impaired loans	4,995	8,158
Commercial Mortgage Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	36,808	14,163
Loans with related allowance recorded investment	32,777	12,928
Allowance	5,342	1,336
Total impaired loans	5,342	1,336
Residential Mortgage And Equity Lines Member
With allocated allowance
Loans with related allowance unpaid principal balance	15,948	14,264
Loans with related allowance recorded investment	13,941	12,428
Allowance	874	1,222
Total impaired loans	874	1,222
With Allocated Allowance Member
With allocated allowance
Loans with related allowance unpaid principal balance	92,147	90,949
Loans with related allowance recorded investment	72,282	65,171
Allowance	12,779	12,183
Total impaired loans	12,779	12,183
Commercial Loans Member
With no allocated allowance
Loans with no related allowance unpaid principal balance	17,027	29,359
Loans with no related allowance recorded investment	13,335	18,963
Real Estate Construction Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	28,983	9,304
Loans with no related allowance recorded investment	16,652	7,277
Commercial Mortgage Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	134,815	189,871
Loans with no related allowance recorded investment	105,193	152,957
Residential Mortgage And Equity Lines Member
With no allocated allowance
Loans with no related allowance unpaid principal balance	3,624	4,303
Loans with no related allowance recorded investment	3,615	4,229
With No Allocated Allowance Member
With no allocated allowance
Loans with no related allowance unpaid principal balance	184,449	232,837
Loans with no related allowance recorded investment	$ 138,795	$ 183,426