Employee Benefit Plans - Net Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Components of net pension cost
Service cost - benefits earned during the year	$ 256	$ 254
Interest costs on projected benefit obligations	372	365
Expected return on plan assets	(590)	(545)
Expected administrative expenses	27	29
Amortization of unrecognized net gain	(159)	(142)
Net periodic pension income	$ (94)	$ (39)