Note 7 - Loans (Details) - Troubled Debt Restructuring by Type of Concession and Type of Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 43,605	$ 38,769
Principal Deferral [Member] | Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	11,400	9,112
Principal Deferral [Member] | Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	9,750	11,333
Principal Deferral [Member] | Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,494	1,564
Principal Deferral [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	23,644	22,009
Rate Reduction [Member] | Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,576	2,916
Rate Reduction [Member] | Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	8,340	9,389
Rate Reduction [Member] | Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,017	1,024
Rate Reduction [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	10,933	13,329
Rate Reduction and Payment Deferral [Member] | Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,425	2,708
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,799	5,834
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	64,612	70,200
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	3,723	3,517
Rate Reduction and Payment Deferral [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	76,559	82,259
Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	15,401	14,736
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	3,734	4,218
Real Estate Construction Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,799	5,834
Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	24,429	25,272
Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	82,702	90,922
Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	11,523	5,454
Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	7,234	6,105
Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	3,919	3,825
Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 111,136	$ 117,597