Pension and Other Postretirement Benefits Plans - The Components of the Net Pension (Benefit) Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Employee Pension Plan [Member]
Interest cost	$ 203	$ 138	$ 406	$ 276
Amortization of unrecognized loss		1		2
Expected return on plan assets	(277)	(258)	(554)	(515)
Net postretirement benefit expense	(74)	(119)	(148)	(237)
Directors' Plan [Member]
Service cost	2	3	4	6
Interest cost	14	12	29	23
Amortization of unrecognized loss	(40)	(7)	(80)	(14)
Net postretirement benefit expense	(24)	8	(47)	15
Other Post Retirement Benefit Plan Defined Benefit [Member]
Service cost	40	67	80	134
Interest cost	96	69	191	139
Amortization of unrecognized loss	(60)		(120)
Amortization of past service credit		(7)		(14)
Net postretirement benefit expense	$ 76	$ 129	$ 151	$ 259