Employee Benefit Plans - Net Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Components of net pension cost
Service cost - benefits earned during the year	$ 373	$ 423	$ 1,118	$ 1,269
Interest costs on projected benefit obligations	294	268	881	804
Expected return on plan assets	(570)	(461)	(1,711)	(1,382)
Expected administrative expenses	29	26	89	78
Amortization of prior service cost	0	0	0	0
Amortization of unrecognized net loss	0	92	0	275
Net periodic pension cost	$ 125	$ 348	$ 376	$ 1,044