Note 7 - Loans (Details) - Troubled Debt Restructuring by Type of Concession and Type of Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 43,608	$ 47,731
Accruing Troubled Debt Restructuring [Member] | Principal Deferral [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	4,813	531
Accruing Troubled Debt Restructuring [Member] | Principal Deferral [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	0	0
Accruing Troubled Debt Restructuring [Member] | Principal Deferral [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	12,740	27,003
Accruing Troubled Debt Restructuring [Member] | Principal Deferral [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,573	1,461
Accruing Troubled Debt Restructuring [Member] | Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	19,126	28,995
Accruing Troubled Debt Restructuring [Member] | Rate Reduction [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,943	3,020
Accruing Troubled Debt Restructuring [Member] | Rate Reduction [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	0	0
Accruing Troubled Debt Restructuring [Member] | Rate Reduction [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	9,130	16,656
Accruing Troubled Debt Restructuring [Member] | Rate Reduction [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,588	1,024
Accruing Troubled Debt Restructuring [Member] | Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	13,661	20,700
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,788	413
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,833	5,834
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	70,991	85,783
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	3,541	2,231
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	83,153	94,261
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Forgiveness of Principal [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs		0
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Forgiveness of Principal [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs		0
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Forgiveness of Principal [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs		739
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Forgiveness of Principal [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs		0
Accruing Troubled Debt Restructuring [Member] | Rate Reduction and Forgiveness of Principal [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs		739
Accruing Troubled Debt Restructuring [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	10,544	3,964
Accruing Troubled Debt Restructuring [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,833	5,834
Accruing Troubled Debt Restructuring [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	92,861	130,181
Accruing Troubled Debt Restructuring [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	6,702	4,716
Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	115,940	144,695
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	4,417	2,430
Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	25,500	26,346
Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 9,781	$ 15,324