Note 7 - Loans (Details) - Troubled Debt Restructuring by Type of Concession and Type of Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 48,524	$ 47,731
Accruing Troubled Debt Restructuring Member | Principal Deferral [Member] | Commercial Loans Member
Financing Receivable, Modifications [Line Items]
Accruing TDRs	473	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	12,800	27,003
Accruing Troubled Debt Restructuring Member | Principal Deferral [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,998	1,461
Accruing Troubled Debt Restructuring Member | Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	15,271	28,995
Accruing Troubled Debt Restructuring Member | Rate Reduction [Member] | Commercial Loans Member
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,969	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	16,143	16,656
Accruing Troubled Debt Restructuring Member | Rate Reduction [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	1,602	1,024
Accruing Troubled Debt Restructuring Member | Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	20,714	20,700
Accruing Troubled Debt Restructuring Member | Rate Reduction and Payment Deferral [Member] | Commercial Loans Member
Financing Receivable, Modifications [Line Items]
Accruing TDRs	2,793	413
Accruing Troubled Debt Restructuring Member | Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,834	5,834
Accruing Troubled Debt Restructuring Member | Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	67,166	85,783
Accruing Troubled Debt Restructuring Member | Rate Reduction and Payment Deferral [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	3,686	2,231
Accruing Troubled Debt Restructuring Member | Rate Reduction and Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	79,479	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	6,235	3,964
Accruing Troubled Debt Restructuring Member | Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	5,834	5,834
Accruing Troubled Debt Restructuring Member | Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	96,109	130,181
Accruing Troubled Debt Restructuring Member | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	7,286	4,716
Accruing Troubled Debt Restructuring Member
Financing Receivable, Modifications [Line Items]
Accruing TDRs	115,464	144,695
Commercial Loans Member
Financing Receivable, Modifications [Line Items]
Accruing TDRs	3,763	2,430
Real Estate Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	25,763	26,346
Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Accruing TDRs	$ 15,223	$ 15,324