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Note 5 - Loans and Allowance for Loan Losses (Details Textual)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loans and Leases Receivable, Gross   $ 10,780,000,000 $ 5,630,000,000  
Impaired Financing Receivable, Recorded Investment   43,923,000 43,696,000  
Impaired Financing Receivable, Related Allowance   338,000 680,000  
Impaired Financing Receivable, Interest Income, Accrual Method   1,780,000 1,593,000 $ 1,200,000
Impaired Financing Receivable, Average Recorded Investment   $ 50,788,000 $ 35,978,000 16,700,000
Financing Receivable, Modifications, Number of Contracts   16 70  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 11,001,000 $ 13,907,000  
Financing Receivable, Specific Reserve   26,000 402,000  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans   33,000    
Mortgage Loans in Process of Foreclosure, Amount   5,057,000 1,714,000  
Real Estate Acquired Through Foreclosure   32,118,000 26,895,000  
Loans and Leases Receivable Classified   76,300,000 47,800,000  
Covered Purchased Impaired Loans Allowance   418,000 954,000 954,000
Provision for Loan Losses Net of FDIC Loss Share Adjustments       400,000
Non Covered Impaired Loans Allowance Reclassified       954,000
Provision for Loan and Lease Losses   26,393,000 20,065,000 9,022,000
Loans and Leases Receivable, Allowance   41,668,000 36,286,000  
Risk Ratings 6,7, and 8 [Member]        
Loans and Leases Receivable Classified   175,600,000 166,000,000  
Substandard [Member]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   17,100,000 17,800,000  
OREO Secured by Residential Real Estate Properties [Member]        
Real Estate Acquired Through Foreclosure   3,828,000 5,094,000  
Commercial Real Estate Portfolio Segment [Member]        
Loans and Leases Receivable, Gross   4,239,612,000 3,028,079,000  
Impaired Financing Receivable, Recorded Investment   31,538,000 30,001,000  
Impaired Financing Receivable, Related Allowance   338,000 417,000  
Impaired Financing Receivable, Interest Income, Accrual Method   1,175,000 1,274,000  
Impaired Financing Receivable, Average Recorded Investment   $ 34,239,000 $ 28,854,000  
Financing Receivable, Modifications, Number of Contracts   5 51  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 8,310,000 $ 11,861,000  
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] | Single Family Residential Loans [Member]        
Loans and Leases Receivable, Gross   1,094,633,000 904,245,000  
Impaired Financing Receivable, Recorded Investment   13,431,000 12,383,000  
Impaired Financing Receivable, Related Allowance   53,000 162,000  
Impaired Financing Receivable, Interest Income, Accrual Method   443,000 419,000  
Impaired Financing Receivable, Average Recorded Investment   $ 12,904,000 $ 9,486,000  
Financing Receivable, Modifications, Number of Contracts   1 23  
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 139,000 $ 1,570,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   1 1  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     $ 31,000  
Real Estate Owned, Transfer to Real Estate Owned     69,000  
Consumer Portfolio Segment [Member]        
Loans and Leases Receivable, Gross   $ 465,516,000 488,563,000  
Impaired Financing Receivable, Recorded Investment   4,775,000 2,173,000  
Impaired Financing Receivable, Related Allowance   1,000  
Impaired Financing Receivable, Interest Income, Accrual Method   153,000 67,000  
Impaired Financing Receivable, Average Recorded Investment   $ 3,357,000 $ 1,412,000  
Financing Receivable, Modifications, Number of Contracts     2  
Financing Receivable, Modifications, Pre-Modification Recorded Investment     $ 50,000  
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  
Restructured Loan [Member]        
Financing Receivable, Modifications, Number of Contracts   13 15  
Proceeds from Collection of Loans Receivable   $ 1.20 $ 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   0 236,000  
Acquired Loans [Member]        
Loans and Leases Receivable, Gross   5,074,076,000 1,305,683,000  
Non Covered Impaired Loans Allowance Reclassified   418,000 954,000  
Provision for Loan and Lease Losses   1,866,000 626,000  
Allowance for Loan and Lease Losses, Write-offs   2,400,000 626,000  
Loans and Leases Receivable, Allowance, Covered   418,000 954,000 954,000
Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans and Leases Receivable, Gross   3,818,037,000 1,170,871,000  
Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]        
Loans and Leases Receivable, Gross   793,228,000 423,176,000  
Acquired Loans [Member] | Consumer Portfolio Segment [Member]        
Loans and Leases Receivable, Gross   51,467,000 49,677,000  
Loans, Including Acquired Loans [Member]        
Loans and Leases Receivable, Allowance   $ 42,086,000 $ 37,240,000 $ 32,305,000