Note 7 - Loans (Details) - Accruing Troubled Debt Restructurings (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Accuring TDRs	$ 34,162	$ 38,769
Principal Deferral [Member] | Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	13,006	9,112
Principal Deferral [Member] | Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	19,116	11,333
Principal Deferral [Member] | Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	3,557	1,564
Principal Deferral [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	35,679	22,009
Rate Reduction [Member] | Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	1,558	2,916
Rate Reduction [Member] | Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	8,317	9,389
Rate Reduction [Member] | Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	1,013	1,024
Rate Reduction [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	10,888	13,329
Rate Reduction and Forgiveness of Principal [Member] | Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	216
Rate Reduction and Forgiveness of Principal [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	216
Rate Reduction and Payment Deferral [Member] | Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	2,333	2,708
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	5,782	5,834
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	64,296	70,200
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	3,895	3,517
Rate Reduction and Payment Deferral [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	76,306	82,259
Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	16,897	14,736
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	3,654	4,218
Real Estate Construction Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	5,782	5,834
Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	24,228	25,272
Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	91,729	90,922
Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	4,754	5,454
Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	8,681	6,105
Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	1,526	3,825
Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accuring TDRs	$ 123,089	$ 117,597