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Note 6 - Loans and Allowance for Credit Losses (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Performing Under Restructured Terms [Member]
Dec. 31, 2013
Performing Under Restructured Terms [Member]
Sep. 30, 2013
Performing Under Restructured Terms [Member]
Jun. 30, 2014
Owner Occupied [Member]
Sold [Member]
Nonperforming Financing Receivable [Member]
Jun. 30, 2014
Commercial Loan [Member]
Sold [Member]
Nonperforming Financing Receivable [Member]
Sep. 30, 2014
Commercial Real Estate Owner Occupied [Member]
Dec. 31, 2013
Commercial Real Estate Owner Occupied [Member]
Sep. 30, 2013
Commercial Real Estate Owner Occupied [Member]
Sep. 30, 2014
Commercial Real Estate and Real Estate Construction Loans [Member]
Sep. 30, 2014
Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member]
Sep. 30, 2014
Commercial Loan [Member]
Dec. 31, 2013
Commercial Loan [Member]
Sep. 30, 2013
Commercial Loan [Member]
Sep. 30, 2014
SBA Loans [Member]
Sep. 30, 2014
Home Equity Line of Credit [Member]
Dec. 31, 2013
Home Equity Line of Credit [Member]
Sep. 30, 2013
Home Equity Line of Credit [Member]
Sep. 30, 2014
Residential Mortgage Loan Long-Term [Member]
Mar. 31, 2014
Commercial Land Acquisition Loans [Member]
Sep. 30, 2014
ADC Loans [Member]
Sep. 30, 2014
Nonaccrual Loans [Member]
Sep. 30, 2014
Nonaccrual Loans Current and in Accordance with Original Terms [Member]
Sep. 30, 2014
Migrated From Nonperforming Loans [Member]
Nonperforming Financing Receivable [Member]
Jun. 30, 2014
Sold [Member]
Nonperforming Financing Receivable [Member]
Sep. 30, 2014
Reclassified to OREO [Member]
Nonperforming Financing Receivable [Member]
Sep. 30, 2014
Paid Off [Member]
Sep. 30, 2014
Construction Loans [Member]
Dec. 31, 2013
Construction Loans [Member]
Sep. 30, 2013
Construction Loans [Member]
Sep. 30, 2014
Nonperforming Financing Receivable [Member]
Sep. 30, 2014
Maximum [Member]
Sep. 30, 2014
Minimum [Member]
Note 6 - Loans and Allowance for Credit Losses (Details) [Line Items]                                                                          
Loans and Leases Receivable, Deferred Income $ 15,200,000 $ 10,900,000 $ 15,200,000 $ 10,900,000 $ 12,700,000                                                                
Servicing Asset at Fair Value, Amount 67,100,000   67,100,000   67,600,000                                                                
Percent Of Loan Portfolio                     11.00%     70.00% 59.00% 23.00%     1.00% 3.00%     4.00%                            
Loan To Value Ratio                                                                       80.00%  
Minimum Debt Service Coverage                                                                       1.15  
Interest Rate Adjustment Frequency     5 years                                                                    
Length Of Loan                               10 years             5 years 24 months               36 months       7 years 5 years
Stress Test Assumption Increase Interest Rates 2.00%   2.00%                                                                    
Amortization Term                                                                       25 years  
Financing Receivable, Net 3,432,548,000   3,432,548,000   2,945,158,000           337,422,000 317,491,000       798,489,000 694,350,000     107,291,000 110,242,000       676,600,000             676,582,000 608,826,000        
Loan Percent 100.00% 100.00% 100.00% 100.00% 100.00%                                       37.00%                        
Impaired Financing Receivable, Recorded Investment 37,220,000 37,524,000 37,220,000 37,524,000 32,646,000           3,502,000 5,452,000 6,426,000     15,431,000 6,779,000 9,607,000   588,000 623,000 511,000                   11,440,000 12,933,000 13,576,000 1,500,000    
Impaired Financing Receivable, Unpaid Principal Balance 39,186,000 37,824,000 39,186,000 37,824,000 32,946,000           3,502,000 5,452,000 6,426,000     16,531,000 6,779,000 9,607,000   588,000 623,000 511,000                   11,931,000 13,233,000 13,876,000 11,100,000    
Financing Receivable, Modifications, Recorded Investment           7,900,000 7,900,000 10,000,000 4,100,000 2,000,000                                   8,300,000 6,100,000   217,000            
Impaired Financing Receivable, Interest Income, Accrual Method                                                     959,000                    
Impaired Financing Receivable, Interest Income, Cash Basis Method                                                   1,500,000                      
Financing Receivable, Modifications, Number of Contracts 1 0 1 0                                               5 2 1              
Real Estate Owned, Transfer to Real Estate Owned                                                                     2,000,000    
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     95,000                                                                    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts         1                                                                
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     $ 2,100,000 $ 6,100,000