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Note 7 - Loans (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Note 7 - Loans (Details) [Line Items]          
Impaired Financing Receivable, Recorded Investment $ 215,801,000   $ 215,801,000   $ 248,597,000
Percentage Of Charge-Off To Contractual Balances For Impaired Loans 22.20%   22.20%   23.20%
Nonaccrual Loans [Member]
          
Note 7 - Loans (Details) [Line Items]          
Impaired Financing Receivable, Recorded Investment 99,900,000   99,900,000   103,900,000
Accruing Troubled Debt Restructuring [Member]
          
Note 7 - Loans (Details) [Line Items]          
Impaired Financing Receivable, Recorded Investment 115,900,000   115,900,000   144,700,000
Reduction Of Stated Interest Rate Member | Minimum [Member]
          
Note 7 - Loans (Details) [Line Items]          
Troubled Debt Restructurings Length of Modifications 12 months   12 months    
Reduction Of Stated Interest Rate Member | Maximum [Member]
          
Note 7 - Loans (Details) [Line Items]          
Troubled Debt Restructurings Length of Modifications 3 years   3 years    
Land Loan [Member]
          
Note 7 - Loans (Details) [Line Items]          
Financing Receivable Modification Number Of Contracts Defaulted Within 12 Months 2   2    
Financing Receivable Modifications Recorded Investment Defaulted Within 12 Months     1,400,000    
Accruing Troubled Debt Restructuring [Member]
          
Note 7 - Loans (Details) [Line Items]          
Troubled Debt Restructurings, Total 115,900,000   115,900,000   144,700,000
Impaired Financing Receivable, Modifications, Related Allowance 6,300,000   6,300,000   1,100,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 0 (251,000) (78,000) (251,000)  
Non Accruing Troubled Debt Restructuring Member
          
Note 7 - Loans (Details) [Line Items]          
Troubled Debt Restructurings, Total 43,600,000   43,600,000   47,700,000
Impaired Financing Receivable, Modifications, Related Allowance 4,500,000   4,500,000   7,800,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down $ (1,188,000) $ 0 $ (2,121,000) $ (4,285,000)  
Minimum [Member]
          
Note 7 - Loans (Details) [Line Items]          
Period Loan Is In Payment Default     60 days    
Maximum [Member]
          
Note 7 - Loans (Details) [Line Items]          
Period Loan Is In Payment Default     90 days