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Note 6 - Loans and Allowance for Credit Losses (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Loans and Leases Receivable, Deferred Income $ 14,500,000   $ 9,900,000 $ 14,500,000 $ 9,900,000 $ 12,700,000
Servicing Asset at Fair Value, Amount 76,100,000     76,100,000   67,600,000
Interest Rate Adjustment Frequency       5 years    
Stress Test Assumption Increase Interest Rates 2.00%     2.00%    
Financing Receivable, Net 3,279,429,000     3,279,429,000   2,945,158,000
Loan Percent 100.00%   100.00% 100.00% 100.00% 100.00%
Impaired Financing Receivable, Recorded Investment 30,413,000   38,302,000 30,413,000 38,302,000 32,646,000
Impaired Financing Receivable, Unpaid Principal Balance 32,986,000   38,302,000 32,986,000 38,302,000 32,946,000
Financing Receivable, Modifications, Number of Contracts 0   0 0 0  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down       95,000    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts       0 1  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   495,000        
Performing Under Restructured Terms [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Financing Receivable, Modifications, Recorded Investment 7,900,000   14,800,000 7,900,000 14,800,000 7,900,000
Owner Occupied [Member] | Sold [Member] | Nonperforming Financing Receivable [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Financing Receivable, Modifications, Recorded Investment 4,100,000     4,100,000    
Commercial Loan [Member] | Sold [Member] | Nonperforming Financing Receivable [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Financing Receivable, Modifications, Recorded Investment 2,000,000     2,000,000    
Commercial Real Estate Owner Occupied [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Percent Of Loan Portfolio 11.00%     11.00%    
Financing Receivable, Net 330,073,000     330,073,000   317,491,000
Impaired Financing Receivable, Recorded Investment 3,230,000   6,438,000 3,230,000 6,438,000 5,452,000
Impaired Financing Receivable, Unpaid Principal Balance 3,230,000   6,438,000 3,230,000 6,438,000 5,452,000
Commercial Real Estate and Real Estate Construction Loans [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Percent Of Loan Portfolio 71.00%     71.00%    
Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Percent Of Loan Portfolio 60.00%     60.00%    
Commercial Loan [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Percent Of Loan Portfolio 22.00%     22.00%    
Length Of Loan       10 years    
Financing Receivable, Net 726,611,000     726,611,000   694,350,000
Impaired Financing Receivable, Recorded Investment 8,671,000   10,760,000 8,671,000 10,760,000 6,779,000
Impaired Financing Receivable, Unpaid Principal Balance 9,771,000   10,760,000 9,771,000 10,760,000 6,779,000
SBA Loans [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Percent Of Loan Portfolio 1.00%     1.00%    
Home Equity Line of Credit [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Percent Of Loan Portfolio 3.00%     3.00%    
Financing Receivable, Net 108,931,000     108,931,000   110,242,000
Impaired Financing Receivable, Recorded Investment 403,000   411,000 403,000 411,000 623,000
Impaired Financing Receivable, Unpaid Principal Balance 403,000   411,000 403,000 411,000 623,000
Residential Mortgage Loan Long-Term [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Percent Of Loan Portfolio 4.00%     4.00%    
Length Of Loan       5 years    
Commercial Land Acquisition Loans [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Length Of Loan   24 months        
ADC Loans [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Financing Receivable, Net 680,600,000     680,600,000    
Loan Percent 54.00%     54.00%    
Nonaccrual Loans [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Impaired Financing Receivable, Interest Income, Cash Basis Method       479,000    
Nonaccrual Loans Current and in Accordance with Original Terms [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Impaired Financing Receivable, Interest Income, Accrual Method       850,000    
Migrated From Nonperforming Loans [Member] | Nonperforming Financing Receivable [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Financing Receivable, Modifications, Recorded Investment 8,300,000     8,300,000    
Financing Receivable, Modifications, Number of Contracts       5    
Sold [Member] | Nonperforming Financing Receivable [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Financing Receivable, Modifications, Recorded Investment 6,100,000     6,100,000    
Financing Receivable, Modifications, Number of Contracts 2          
Reclassified to OREO [Member] | Nonperforming Financing Receivable [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Financing Receivable, Modifications, Number of Contracts       1    
Paid Off [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Financing Receivable, Modifications, Recorded Investment 217,000     217,000    
Construction Loans [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Length Of Loan       36 months    
Financing Receivable, Net 680,632,000     680,632,000   608,826,000
Impaired Financing Receivable, Recorded Investment 11,418,000   14,489,000 11,418,000 14,489,000 12,933,000
Impaired Financing Receivable, Unpaid Principal Balance 12,516,000   14,489,000 12,516,000 14,489,000 13,233,000
Nonperforming Financing Receivable [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Impaired Financing Receivable, Recorded Investment 1,800,000     1,800,000    
Impaired Financing Receivable, Unpaid Principal Balance 11,400,000     11,400,000    
Real Estate Owned, Transfer to Real Estate Owned       $ 2,000,000    
Maximum [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Loan To Value Ratio 80.00%     80.00%    
Minimum Debt Service Coverage 1.15     1.15    
Length Of Loan       7 years    
Amortization Term       25 years    
Minimum [Member]
            
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]            
Length Of Loan       5 years