Note 7 - Loans (Details) - Impaired Loans and Related Allowance For Credit Losses (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
With allocated allowance
Allowance	$ 23,362	$ 12,183
Total impaired loans	277,280	323,786
Total impaired loans	215,801	248,597
Total impaired loans	23,362	12,183
Commercial Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	20,896	29,359
Loans with no related allowance recorded investment	17,699	18,963
Real Estate Construction Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	25,438	9,304
Loans with no related allowance recorded investment	15,135	7,277
Commercial Mortgage Loans [Member]
With no allocated allowance
Loans with no related allowance unpaid principal balance	125,489	189,871
Loans with no related allowance recorded investment	94,167	152,957
Residential Mortgage And Equity Lines Member
With no allocated allowance
Loans with no related allowance unpaid principal balance	2,978	4,303
Loans with no related allowance recorded investment	2,969	4,229
With No Allocated Allowance Member
With no allocated allowance
Loans with no related allowance unpaid principal balance	174,801	232,837
Loans with no related allowance recorded investment	129,970	183,426
Commercial Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	22,099	7,804
Loans with related allowance recorded investment	17,352	4,959
Allowance	10,849	1,467
Total impaired loans	10,849	1,467
Real Estate Construction Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	28,847	54,718
Loans with related allowance recorded investment	19,694	34,856
Allowance	5,691	8,158
Total impaired loans	5,691	8,158
Commercial Mortgage Loans [Member]
With allocated allowance
Loans with related allowance unpaid principal balance	35,582	14,163
Loans with related allowance recorded investment	34,688	12,928
Allowance	6,129	1,336
Total impaired loans	6,129	1,336
Residential Mortgage And Equity Lines Member
With allocated allowance
Loans with related allowance unpaid principal balance	15,951	14,264
Loans with related allowance recorded investment	14,097	12,428
Allowance	693	1,222
Total impaired loans	693	1,222
With Allocated Allowance Member
With allocated allowance
Loans with related allowance unpaid principal balance	102,479	90,949
Loans with related allowance recorded investment	85,831	65,171
Allowance	23,362	12,183
Total impaired loans	$ 23,362	$ 12,183