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Note 4 - Credit Quality (Details Textual) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Percentage of Loan Loss Covered by FDIC 80.00%      
Financing Receivable, Collectively Evaluated for Impairment $ 1,768,659     $ 1,785,574
Loans Deemed to be Impaired, Threshold     $ 500 250
Impaired Financing Receivable, Recorded Investment, Total [1] 34,000     33,301
Restructured Loans, Reserves $ 250      
Performing Status Returned Period 180 days      
Financing Receivable, Modifications, Recorded Investment $ 9,355     9,663
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 $ 0    
Financial Asset Acquired with Credit Deterioration [Member]        
Impaired Financing Receivable, Recorded Investment, Total 0     0
Impaired Loans [Member]        
Financing Receivable, Collectively Evaluated for Impairment 25,420     20,130
Non-covered Loans [Member]        
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 46     1
Covered Loans [Member]        
Financing Receivable, Modifications, Recorded Investment $ 0     $ 0
[1] Total impaired loans include loans totaling $25.42 million as of September 30, 2018, and $20.13 million as of December 31, 2017, that do not meet the Company's evaluation threshold for individual impairment and are therefore collectively evaluated for impairment. During the first quarter of 2018, the Company changed the threshold for quarterly reviews of individual loans that are deemed to be impaired from $250 thousand to $500 thousand or greater.