Note 7 - Loans (Details) - Troubled Debt Restructuring by Type of Concession and Type of Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 37,797
Accruing Troubled Debt Restructuring [Member] | Principal Deferral [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	12,047	9,112
Accruing Troubled Debt Restructuring [Member] | Principal Deferral [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	11,708	11,333
Accruing Troubled Debt Restructuring [Member] | Principal Deferral [Member] | Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,513	1,564
Accruing Troubled Debt Restructuring [Member] | Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	26,268	22,009
Accruing Troubled Debt Restructuring [Member] | Rate Reduction [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,594	2,916
Accruing Troubled Debt Restructuring [Member] | Rate Reduction [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	8,330	9,389
Accruing Troubled Debt Restructuring [Member] | Rate Reduction [Member] | Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,021	1,024
Accruing Troubled Debt Restructuring [Member] | Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	10,945	13,329
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,566	2,708
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,817	5,834
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	69,832	70,200
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	3,494	3,517
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	81,709	82,259
Accruing Troubled Debt Restructuring [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	16,207	14,736
Accruing Troubled Debt Restructuring [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,817	5,834
Accruing Troubled Debt Restructuring [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	89,870	90,922
Accruing Troubled Debt Restructuring [Member] | Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	7,028	6,105
Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	118,922	117,597
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	4,174
Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	24,729
Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,403
Residential Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 3,491