Employee Benefit Plans - Net Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Components of net pension cost
Service cost - benefits earned during the year	$ 254	$ 408
Interest costs on projected benefit obligations	365	296
Expected return on plan assets	(545)	(558)
Expected administrative expenses	29	29
Amortization of prior service cost	0	0
Amortization of unrecognized net loss	(142)	0
Net periodic pension cost	$ (39)	$ 175