Employee Benefit Plans - Reconciliation of Benefit Obligations, Plan Assets and Funded Status (Details) - Other postretirement benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in benefit obligation:
Benefit obligation at beginning of year	$ 4,244	$ 5,544
Service cost	72	91	$ 104
Interest cost	206	119	99
Actuarial gain	(22)	(833)
Plan participants' contributions	543	600
Benefits paid	(1,121)	(1,277)
Benefit obligation, end of year	$ 3,922	$ 4,244	$ 5,544