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Note 4 - Loans and Allowance for Credit Losses (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Loans and Leases Receivable, Deferred Income $ 12,900,000 $ 8,800,000
Servicing Asset at Fair Value, Amount 67,600,000 41,200,000
Interest Rate Adjustment Frequency 5 years  
Stress Test Assumption Increase Interest Rates 2.00%  
Financing Receivable, Net 2,945,158,000 2,493,095,000
100.00% 100.00%
Impaired Financing Receivable, Recorded Investment 32,646,000 45,997,000
Impaired Financing Receivable, Unpaid Principal Balance 32,946,000 48,322,000
Financing Receivable, Modifications, Recorded Investment   2,600,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 4  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 8,100,000  
Financing Receivable, Modifications, Number of Contracts 9 8
Nonaccrual Loans [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Impaired Financing Receivable, Interest Income, Cash Basis Method 117,000  
Nonaccrual Loans Current and in Accordance with Original Terms [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Impaired Financing Receivable, Interest Income, Accrual Method 1,800,000  
Reclassified to Nonperforming Loans [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 3  
Reclassified to OREO [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 1  
Performing Under Restructured Terms [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Financing Receivable, Modifications, Recorded Investment 7,900,000 15,300,000
Modified in Current Year [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Financing Receivable, Modifications, Recorded Investment 1,200,000  
Financing Receivable, Modifications, Number of Contracts 1 2
Home Equity Line of Credit [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Loans and Leases Receivable, Deferred Income 235,000 301,000
Percent Of Loan Portfolio 4.00%  
Financing Receivable, Net 110,242,000 106,844,000
Impaired Financing Receivable, Recorded Investment 623,000 513,000
Impaired Financing Receivable, Unpaid Principal Balance 623,000 513,000
Commercial Real Estate Owner Occupied [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Percent Of Loan Portfolio 12.00%  
Financing Receivable, Net 317,491,000 297,857,000
Impaired Financing Receivable, Recorded Investment 5,452,000 6,659,000
Impaired Financing Receivable, Unpaid Principal Balance 5,452,000 6,659,000
Financing Receivable, Modifications, Number of Contracts 1 1
Commercial Real Estate and Real Estate Construction Loans [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Percent Of Loan Portfolio 69.00%  
Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Percent Of Loan Portfolio 57.00%  
Commercial Loan [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Percent Of Loan Portfolio 24.00%  
Length Of Loan 10 years  
Financing Receivable, Net 694,350,000 545,070,000
Impaired Financing Receivable, Recorded Investment 6,779,000 9,248,000
Impaired Financing Receivable, Unpaid Principal Balance 6,779,000 9,461,000
Financing Receivable, Modifications, Number of Contracts 3 3
SBA Loans [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Percent Of Loan Portfolio 1.00%  
Residential Mortgage Loan Long-Term [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Percent Of Loan Portfolio 3.00%  
Length Of Loan 10 years  
Commercial Land Acquisition Loans [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Length Of Loan   24 months
ADC Loans [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Financing Receivable, Net 608,800,000  
47.00%  
Construction Loans [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Length Of Loan   36 months
Financing Receivable, Net 608,826,000 562,530,000
Impaired Financing Receivable, Recorded Investment 12,933,000 23,235,000
Impaired Financing Receivable, Unpaid Principal Balance 13,233,000 25,347,000
Nonperforming Financing Receivable [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Impaired Financing Receivable, Recorded Investment 2,000,000  
Impaired Financing Receivable, Unpaid Principal Balance $ 11,500,000  
Maximum [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Loan To Value Ratio 80.00%  
Minimum Debt Service Coverage 1.15%  
Length Of Loan 7 years  
Amortization Term 25 years  
Minimum [Member]
    
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]    
Length Of Loan 5 years