Employee Benefit Plans - Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Summary of employee benefits charged to operating expenses
Payroll taxes	$ 374	$ 338	$ 1,228	$ 1,123
Medical plans	505	426	1,400	1,368
401(k) match and profit sharing	250	411	761	1,207
Periodic pension cost	265	402	796	1,206
Other	11	20	30	32
Total employee benefits	$ 1,405	$ 1,597	$ 4,215	$ 4,936