EPS (Computation of Basic and Diluted 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	$ 16,795	$ 19,740
Dividends and undistributed earnings allocated to participating securities	(43)	(53)
Net income available to common shareholders	$ 16,752	$ 19,687
Weighted-average common shares outstanding for basic EPS	14,741,271	14,916,387
Dilutive effect of stock-based awards (shares)	81,061	78,147
Weighted-average common and potential common shares for diluted EPS (shares)	14,822,332	14,994,534
Basic EPS (in dollars per share)	$ 1.14	$ 1.32
Diluted EPS (in dollars per share)	$ 1.13	$ 1.31