Pension and Other Postretirement Benefits Plans - The Components of the Net Pension (Benefit) Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Employee Pension Plan [Member]
Interest cost	$ 194	$ 203
Expected return on plan assets	(284)	(277)
Net postretirement benefit expense	(90)	(74)
Directors' Plan [Member]
Service cost	2	2
Interest cost	11	15
Amortization of unrecognized loss	(38)	(40)
Net postretirement benefit expense	(25)	(23)
Other Post Retirement Benefit Plan Defined Benefit [Member]
Service cost	42	40
Interest cost	96	95
Amortization of unrecognized loss	(54)	(60)
Net postretirement benefit expense	$ 84	$ 75