Employee Benefit Plans - Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Summary of employee benefits charged to operating expenses
Payroll taxes	$ 344	$ 356	$ 786	$ 791
Medical plans	466	519	941	969
401(k) match and profit sharing	426	444	796	943
Periodic pension cost	367	482	804	898
Other	4	3	12	7
Total employee benefits	$ 1,608	$ 1,804	$ 3,339	$ 3,608