Earnings per Common Share (Calculation of Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 11,256	$ 19,957	$ 24,068	$ 36,440
Less dividends and undistributed earnings allocated to participating securities	(19)	(57)	(48)	(111)
Net income available to common shareholders	$ 11,237	$ 19,900	$ 24,020	$ 36,329
Weighted average common shares outstanding - basic	17,011,000	17,303,000	17,042,000	17,317,000
Dilutive effect of common stock equivalents	19,000	111,000	43,000	134,000
Weighted average common shares outstanding - diluted	17,030,000	17,414,000	17,085,000	17,451,000
Basic earnings per common share	$ 0.66	$ 1.15	$ 1.41	$ 2.10
Diluted earnings per common share	$ 0.66	$ 1.14	$ 1.41	$ 2.08
Antidilutive common stock equivalents	478,490	196,943	377,989	141,043