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Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs $ 48,524 $ 47,731
Interest Deferral [Member] | Commercial Loans Member
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 0 0
Interest Deferral [Member] | Real Estate Construction Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 0 0
Interest Deferral [Member] | Commercial Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 1,514 1,685
Interest Deferral [Member] | Residential Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 258 275
Interest Deferral [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 1,772 1,960
Principal Deferral [Member] | Commercial Loans Member
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 2,330 912
Principal Deferral [Member] | Real Estate Construction Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 16,388 16,767
Principal Deferral [Member] | Commercial Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 1,840 2,817
Principal Deferral [Member] | Residential Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 2,483 2,010
Principal Deferral [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 23,041 22,506
Rate Reduction and Forgiveness of Principal [Member] | Commercial Loans Member
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 1,433 1,518
Rate Reduction and Forgiveness of Principal [Member] | Real Estate Construction Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 0 0
Rate Reduction and Forgiveness of Principal [Member] | Commercial Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 0 0
Rate Reduction and Forgiveness of Principal [Member] | Residential Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 0 0
Rate Reduction and Forgiveness of Principal [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 1,433 1,518
Rate Reduction and Payment Deferral [Member] | Commercial Loans Member
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 0 0
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 9,375 0
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 11,869 5,076
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 1,034 760
Rate Reduction and Payment Deferral [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 22,278 5,836
Rate Reduction [Member] | Commercial Loans Member
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs   0
Rate Reduction [Member] | Real Estate Construction Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs   9,579
Rate Reduction [Member] | Commercial Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs   5,746
Rate Reduction [Member] | Residential Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs   586
Rate Reduction [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs   15,911
Commercial Loans Member
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 3,763 2,430
Real Estate Construction Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 25,763 26,346
Commercial Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs 15,223 15,324
Residential Mortgage Loans [Member]
    
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items]    
Non-accrual TDRs $ 3,775 $ 3,631