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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income applicable to common equity (numerator)	$ 34,760	$ 22,063	$ 82,690	$ 64,789
Weighted average number of common shares outstanding - basic (denominator) (in shares)	26,906	26,866	26,889	26,851
Basic earnings per common share (in dollars per share)	$ 1.29	$ 0.82	$ 3.08	$ 2.41
Add common stock equivalents for options (in shares)	10	9	12	17
Weighted average number of common shares outstanding - diluted (denominator) (in shares)	26,916	26,875	26,901	26,868
Diluted earnings per common share (in dollars per share)	$ 1.29	$ 0.82	$ 3.07	$ 2.41