Pension and Other Postretirement Benefits Plans - The Components of the Net Pension (Benefit) Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Employee Pension Plan [Member]
Interest cost	$ 203	$ 138	$ 609	$ 414
Amortization of unrecognized loss		1		3
Expected return on plan assets	(278)	(257)	(832)	(772)
Net postretirement benefit expense	(75)	(118)	(223)	(355)
Directors' Plan [Member]
Service cost	2	3	6	9
Interest cost	15	11	44	34
Amortization of unrecognized loss	(40)	(7)	(120)	(21)
Net postretirement benefit expense	(23)	7	(70)	22
Other Post Retirement Benefit Plan Defined Benefit [Member]
Service cost	40	67	120	201
Interest cost	95	70	286	209
Amortization of unrecognized loss	(60)		(180)
Amortization of past service credit		(7)		(21)
Net postretirement benefit expense	$ 75	$ 130	$ 226	$ 389