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Note 18 - Earnings Per Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income                 $ 21,485 $ 25,126 $ 24,540
Dividends on preferred stock                 105
Net income available to common shareholders $ 1,213 $ 7,652 $ 6,418 $ 6,202 $ 6,404 $ 6,383 $ 6,255 $ 6,084 $ 21,485 $ 25,126 $ 24,435
Weighted average common shares outstanding, basic (in shares) 16,992,519 17,005,654 17,012,189 16,998,125 16,981,010 17,031,074 17,414,320 17,859,197 17,002,116 17,319,689 18,531,039
Convertible preferred stock (in shares)                 166,942
Total dilutive effect of potential common shares (in shares)                 75,726 45,835 196,425
Weighted average common shares outstanding, diluted (in shares) 17,083,949 17,082,729 17,082,832 17,072,174 17,043,869 17,083,526 17,462,845 17,892,531 17,077,842 17,365,524 18,727,464
Basic earnings per common share (in dollars per share) $ 0.07 $ 0.45 $ 0.38 $ 0.36 $ 0.38 $ 0.37 $ 0.36 $ 0.34 $ 1.26 $ 1.45 $ 1.32
Diluted earnings per common share (in dollars per share) $ 0.07 $ 0.45 $ 0.38 $ 0.36 $ 0.38 $ 0.37 $ 0.36 $ 0.34 $ 1.26 $ 1.45 $ 1.31
Antidilutive potential common shares (in shares)                 67,701 110,871 127,882
Employee Stock Option [Member]                      
Dilutive effect of potential common shares (in shares)                 52,205 34,530 26,487
Antidilutive potential common shares (in shares)                 64,081 107,592 127,882
Restricted Stock [Member]                      
Dilutive effect of potential common shares (in shares)                 23,521 11,305 2,996
Antidilutive potential common shares (in shares)                 3,620 3,279