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Note 11 - Earnings Per Common Share - Earnings Per Common Share and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income applicable to common equity (numerator) $ 28,263 $ 35,057 $ 88,366 $ 106,936
Weighted average number of common shares outstanding - basic (denominator) (in shares) 25,341 26,685 25,953 26,680
Basic earnings per common share (in dollars per share) $ 1.12 $ 1.31 $ 3.4 $ 4.01
Add common stock equivalents for options (in shares) 0 1 0 1
Weighted average number of common shares outstanding - diluted (denominator) (in shares) 25,341 26,686 25,953 26,681
Diluted earnings per common share (in dollars per share) $ 1.12 $ 1.31 $ 3.4 $ 4.01