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Note 13 - Earnings Per Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net income $ 7,652 $ 6,383 $ 20,272 $ 18,722
Dividends on preferred stock
Net income available to common shareholders $ 7,652 $ 6,383 $ 20,272 $ 18,722
Weighted average common shares outstanding, basic (in shares) 17,005,654 17,031,074 17,005,350 17,433,406
Total dilutive effect of potential common shares (in shares) 77,075 52,452 71,608 41,805
Weighted average common shares outstanding, diluted (in shares) 17,082,729 17,083,526 17,076,958 17,475,211
Basic earnings per common share (in dollars per share) $ 0.45 $ 0.37 $ 1.19 $ 1.07
Diluted earnings per common share (in dollars per share) $ 0.45 $ 0.37 $ 1.19 $ 1.07
Antidilutive potential common shares (in shares) 71,592 127,789 75,868 127,789
Employee Stock Option [Member]        
Dilutive effect of potential common shares (in shares) 49,739 38,746 50,140 31,856
Antidilutive potential common shares (in shares) 71,592 127,789 75,868 127,789
Restricted Stock [Member]        
Dilutive effect of potential common shares (in shares) 27,336 13,706 21,468 9,949