Shareholders' Equity and Earnings Per Common Share - Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share Reconciliation [Abstract]
Net income	$ 17,543	$ 17,297	$ 45,324	$ 48,265
Weighted average shares outstanding (in shares)	20,922	21,058	21,021	21,106
Stock units for deferred compensation plan for non-employee directors (in shares)	163	139	157	134
Effect of stock options (in shares)	8	30	12	43
Performance share units (in shares)	21	25	17	23
Weighted average shares outstanding for calculation of diluted earnings per share (in shares)	21,114	21,252	21,207	21,306
Net income per common share
Basic (in dollars per share)	$ 0.84	$ 0.82	$ 2.16	$ 2.29
Diluted (in dollars per share)	$ 0.83	$ 0.81	$ 2.14	$ 2.27