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Note 5 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loans and Leases Receivable, Gross $ 6,303,000,000   $ 6,303,000,000     $ 5,633,000,000    
Impaired Financing Receivable, Recorded Investment 51,809,000   51,809,000     43,696,000    
Impaired Financing Receivable, Related Allowance 6,321,000   6,321,000     680,000    
Impaired Financing Receivable, Interest Income, Accrual Method 350,000 $ 430,000 1,050,000 $ 1,230,000        
Impaired Financing Receivable, Average Recorded Investment $ 54,468,000 $ 42,121,000 $ 52,504,000 $ 34,048,000        
Financing Receivable, Modifications, Number of Contracts 1 21 13 67        
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 608,000 $ 3,011,000 $ 9,237,000 $ 13,372,000        
Financing Receivable, Specific Reserve 0   33,000 402,000        
Mortgage Loans in Process of Foreclosure, Amount 1,180,000   1,180,000     1,714,000    
Real Estate Acquired Through Foreclosure 31,477,000   31,477,000     26,895,000    
Loans and Leases Receivable Classified 22,600,000   22,600,000     47,800,000    
Provision for Loan and Lease Losses 5,462,000 8,294,000 16,792,000 15,733,000        
Loans and Leases Receivable, Allowance 42,717,000   42,717,000     36,286,000    
Risk Ratings 6,7, and 8 [Member]                
Loans and Leases Receivable Classified 130,600,000   130,600,000     166,000,000    
Substandard [Member]                
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 7,900,000   7,900,000     17,800,000    
OREO Secured by Residential Real Estate Properties [Member]                
Real Estate Acquired Through Foreclosure 5,275,000   5,275,000     5,094,000    
Acquired Loans [Member]                
Loans and Leases Receivable, Gross 1,092,039,000   1,092,039,000     1,305,683,000    
Provision for Loan and Lease Losses 0 215,000 1,464,000 522,000        
Allowance for Loan and Lease Losses, Write-offs   215,000 2,000,000 522,000        
Loans and Leases Receivable, Allowance, Covered 391,000 954,000 391,000 954,000   954,000 $ 954,000 $ 954,000
Loans, Including Acquired Loans [Member]                
Loans and Leases Receivable, Allowance 43,108,000 35,048,000 43,108,000 35,048,000 $ 41,770,000 37,240,000 $ 34,477,000 $ 32,305,000
OREO Received in Full or Partial Satisfaction of Loans [Member] | Commercial Real Estate and Residential Real Estate [Member]                
Financing Receivable, Modifications, Pre-Modification Recorded Investment     117,000 166,500        
Commercial Real Estate Portfolio Segment [Member]                
Loans and Leases Receivable, Gross 3,794,900,000   3,794,900,000     3,028,079,000    
Impaired Financing Receivable, Recorded Investment 33,680,000   33,680,000     30,001,000    
Impaired Financing Receivable, Related Allowance 2,325,000   2,325,000     417,000    
Impaired Financing Receivable, Interest Income, Accrual Method 223,000 341,000 687,000 1,034,000        
Impaired Financing Receivable, Average Recorded Investment 34,766,000 $ 34,352,000 $ 34,913,000 $ 28,567,000        
Financing Receivable, Modifications, Number of Contracts   15 3 49        
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 1,577,000 $ 7,818,000 $ 11,335,000        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1          
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     $ 440,000          
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]                
Loans and Leases Receivable, Gross 978,309,000   978,309,000     1,170,871,000    
Consumer Portfolio Segment [Member]                
Loans and Leases Receivable, Gross 494,262,000   494,262,000     488,563,000    
Impaired Financing Receivable, Recorded Investment 4,153,000   4,153,000     2,173,000    
Impaired Financing Receivable, Related Allowance       1,000    
Impaired Financing Receivable, Interest Income, Accrual Method 35,000 14,000 76,000 42,000        
Impaired Financing Receivable, Average Recorded Investment 3,597,000 $ 1,763,000 3,003,000 $ 1,222,000        
Financing Receivable, Modifications, Number of Contracts   1   2        
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 47,000   $ 50,000        
Consumer Portfolio Segment [Member] | Acquired Loans [Member]                
Loans and Leases Receivable, Gross $ 29,662,000   $ 29,662,000     $ 49,677,000    
Consumer Portfolio Segment [Member] | Consumer Loans [Member]                
Financing Receivable, Modifications, Subsequent Default, Number of Contracts       1        
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down       $ 39,000