Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic
Net income available to common shareholders	$ 85,030	$ 89,264	$ 77,588
Less: income attributable to unvested stock-based compensation awards	(250)	(615)	(857)
Net earnings allocated to common shareholders	$ 84,780	$ 88,649	$ 76,731
Weighted average shares outstanding, including unvested stock-based compensation awards (in shares)	14,532,448	14,798,447	14,933,990
Less: average unvested stock-based compensation awards (in shares)	(204,168)	(229,684)	(230,600)
Weighted average shares outstanding - Basic (in shares)	14,328,280	14,568,763	14,703,390
Diluted
Net earnings allocated to common shareholders	$ 84,780	$ 88,649	$ 76,731
Weighted average shares outstanding - Basic (in shares)	14,328,280	14,568,763	14,703,390
Plus: incremental shares from assumed conversion of stock-based compensation awards (in shares)	76,014	79,404	38,650
Weighted average shares outstanding - Diluted (in shares)	14,404,294	14,648,167	14,742,040
Basic EPS (in dollars per share)	$ 5.92	$ 6.08	$ 5.22
Diluted EPS (in dollars per share)	$ 5.89	$ 6.05	$ 5.20
Antidilutive securities excluded from computation of earning per share (in shares)	4,984	7,591	14,982