Earnings Per Common Share (Calculation of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 16,483	$ 20,471
Less dividends and undistributed earnings allocated to participating securities	(54)	(56)
Net income available to common shareholders	$ 16,429	$ 20,415
Weighted average common shares outstanding - basic	17,331,000	17,275,000
Dilutive effect of common stock equivalents	151,000	156,000
Weighted average common shares outstanding - diluted	17,482,000	17,431,000
Basic earnings per common share	$ 0.95	$ 1.18
Diluted earnings per common share	$ 0.94	$ 1.17
Antidilutive common stock equivalents	94,175	149,575