Annual report pursuant to Section 13 and 15(d)

Note 19 - Earnings Per Common Share - Summary of Earnings Per Common Share (Details)

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Note 19 - Earnings Per Common Share - Summary of Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted average common shares outstanding (in shares)                 53,530,766 53,172,695 52,887,359
Net income available to common stockholders $ 41,005 $ 37,563 $ 35,602 $ 35,010 $ 36,205 $ 34,560 $ 33,509 $ 32,603 $ 149,180 $ 136,877 $ 93,030
Basic earnings per common share (in dollars per share) $ 0.77 $ 0.70 $ 0.67 $ 0.65 $ 0.68 $ 0.65 $ 0.63 $ 0.61 $ 2.79 $ 2.57 $ 1.76
Dilutive effects of assumed conversions and exercise of stock options and warrants (in shares)                 572,308 997,184 1,236,598
Weighted average common and dilutive potential common shares outstanding (in shares)                 54,103,074 54,169,879 54,123,957
Net income available to common stockholders                 $ 149,180 $ 136,877 $ 93,030
Diluted earnings per common share (in dollars per share) $ 0.76 $ 0.69 $ 0.66 $ 0.65 $ 0.67 $ 0.64 $ 0.62 $ 0.60 $ 2.76 $ 2.53 $ 1.72