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EPS (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income	$ 69,014	$ 59,486	$ 57,203
Dividends and undistributed earnings allocated to participating securities(1)	(190)	(149)	(120)
Net income available to common shareholders	$ 68,824	$ 59,337	$ 57,083
Weighted-average common shares outstanding for basic EPS	14,903,855	14,985,235	15,407,289
Dilutive effect of stock-based awards	67,723	38,532	45,733
Weighted-average common and potential common shares for diluted EPS	14,971,578	15,023,767	15,453,022
Basic EPS	$ 4.62	$ 3.96	$ 3.70
Diluted EPS	$ 4.60	$ 3.95	$ 3.69

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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