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Note 3 - Earnings Per Common Share - Summary of Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Weighted average common shares outstanding (in shares) 54,549,664 54,424,561 54,518,996 54,398,845
Net income available to common stockholders $ 59,907 $ 53,340 $ 162,038 $ 164,748
Basic earnings per common share (in dollars per share) $ 1.1 $ 0.98 $ 2.97 $ 3.03
Dilutive effects of assumed exercise of stock options and vesting of performance shares (in shares) 92,918 106,074 96,651 131,952
Weighted average common and dilutive potential common shares outstanding (in shares) 54,642,582 54,530,635 54,615,647 54,530,797
Net income available to common stockholders $ 59,907 $ 53,340 $ 162,038 $ 164,748
Diluted earnings per common share (in dollars per share) $ 1.1 $ 0.98 $ 2.97 $ 3.02