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Note 4 - Loans and Allowance for Loan Losses (Details Textual)
 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loans and Leases Receivable, Gross   $ 5,630,000,000 $ 4,920,000,000  
Impaired Financing Receivable, Recorded Investment   43,696,000 18,190,000  
Impaired Financing Receivable, Related Allowance   680,000 2,831,000  
Impaired Financing Receivable, Interest Income, Accrual Method $ 1,200,000 1,593,000 1,200,000 $ 800,000
Impaired Financing Receivable, Average Recorded Investment 16,675,000 $ 35,978,000 $ 16,700,000 17,500,000
Financing Receivable, Modifications, Number of Contracts   70 18  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 13,907,000 $ 2,636,000  
Loans and Leases Receivable, Allowance, Covered   402,000 $ 113,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0  
Mortgage Loans in Process of Foreclosure, Amount   1,714,000 $ 1,064,000  
Real Estate Acquired Through Foreclosure   26,895,000 44,820,000  
Loans and Leases Receivable Classified   47,800,000 49,900,000  
Covered Purchased Impaired Loans Allowance       954,000
Provision for Loan Losses Net of FDIC Loss Share Adjustments       400,000
Non Covered Impaired Loans Allowance Reclassified   954,000 954,000 954,000
Provision for Loan and Lease Losses   20,065,000 9,022,000 7,245,000
Loans and Leases Receivable, Allowance   36,286,000 31,351,000  
Risk Ratings 6,7, and 8 [Member]        
Loans and Leases Receivable Classified   166,000,000 153,700,000  
Substandard [Member]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   17,800,000 23,500,000  
OREO Secured by Residential Real Estate Properties [Member]        
Real Estate Acquired Through Foreclosure   5,094,000 5,916,000  
Consumer Portfolio Segment [Member]        
Loans and Leases Receivable, Gross   488,563,000 385,668,000  
Impaired Financing Receivable, Recorded Investment   2,173,000 921,000  
Impaired Financing Receivable, Related Allowance   1,000 $ 92,000  
Impaired Financing Receivable, Interest Income, Accrual Method 70,000 67,000    
Impaired Financing Receivable, Average Recorded Investment 973,000 $ 1,412,000    
Financing Receivable, Modifications, Number of Contracts   2 1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 50,000 $ 13,000  
Consumer Portfolio Segment [Member] | Consumer Loans [Member]        
Loans and Leases Receivable, Allowance, Covered   $ 39,000    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   1    
Commercial Real Estate Portfolio Segment [Member]        
Loans and Leases Receivable, Gross   $ 3,028,079,000 2,204,992,000  
Impaired Financing Receivable, Recorded Investment   30,001,000 15,017,000  
Impaired Financing Receivable, Related Allowance   417,000 $ 2,307,000  
Impaired Financing Receivable, Interest Income, Accrual Method 987,000 1,274,000    
Impaired Financing Receivable, Average Recorded Investment 13,712,000 $ 28,854,000    
Financing Receivable, Modifications, Number of Contracts   51 12  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 11,861,000 $ 2,276,000  
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]        
Loans and Leases Receivable, Gross   904,245,000 696,180,000  
Impaired Financing Receivable, Recorded Investment   12,383,000 5,647,000  
Impaired Financing Receivable, Related Allowance   162,000 $ 1,034,000  
Impaired Financing Receivable, Interest Income, Accrual Method 370,000 419,000    
Impaired Financing Receivable, Average Recorded Investment $ 5,148,000 $ 9,486,000    
Financing Receivable, Modifications, Number of Contracts   23 11  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 1,570,000 $ 1,179,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   1    
Financing Receivable, Modifications, Subsequent Default, Charge Off   $ 31,000    
Real Estate Owned, Transfer to Real Estate Owned   $ 69,000    
Restructured Loan [Member]        
Financing Receivable, Modifications, Number of Contracts   15    
Proceeds from Collection of Loans Receivable   $ 3,700,000    
Commercial Real Estate and Residential Real Estate [Member] | OREO Received in Full or Partial Satisfaction of Loans [Member]        
Financing Receivable, Modifications, Pre-Modification Recorded Investment   236,000 167,000  
Acquired Loans [Member]        
Loans and Leases Receivable, Gross   1,305,683,000 1,672,901,000  
Loans and Leases Receivable, Allowance, Covered   954,000 954,000 954,000
Non Covered Impaired Loans Allowance Reclassified   954,000 954,000  
Provision for Loan and Lease Losses   626,000 736,000  
Allowance for Loan and Lease Losses, Write-offs   626,000    
Loans and Leases Receivable, Allowance   0    
Acquired Loans [Member] | Consumer Portfolio Segment [Member]        
Loans and Leases Receivable, Gross   49,677,000 75,606,000  
Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans and Leases Receivable, Gross   1,170,871,000 1,432,189,000  
Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]        
Loans and Leases Receivable, Gross   423,176,000 501,002,000  
Loans, Including Acquired Loans [Member]        
Loans and Leases Receivable, Allowance   $ 37,240,000 $ 32,305,000 $ 29,982,000