Pension and Other Postretirement Benefits Plans - The Components of the Net Pension (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Directors' Plan [Member]
Service cost	$ 8	$ 11	$ 16
Interest cost	59	48	46
Amortization of unrecognized loss	(161)	(29)	(18)
Net postretirement benefit expense	(94)	30	44
Current year actuarial loss (gain)	(285)	(623)	(184)
Amortization of actuarial loss	(161)	(29)	(18)
Total recognized in other comprehensive loss	(124)	(594)	(166)
Total recognized in net postretirement expense and other comprehensive loss	(218)	(564)	(122)
Retirement Plan [Member]
Interest cost	812	553	512
Amortization of unrecognized loss		5	488
Expected return on plan assets	(1,109)	(1,031)	(1,096)
Net postretirement benefit expense	(297)	(473)	(96)
Current year actuarial loss (gain)	34	2,535	127
Amortization of actuarial loss		5	488
Total recognized in other comprehensive loss	34	2,530	(361)
Total recognized in net postretirement expense and other comprehensive loss	(263)	2,057	(457)
Other Post Retirement Benefit Plan Defined Benefit [Member]
Service cost	158	269	293
Interest cost	381	277	233
Amortization of unrecognized loss	(238)		30
Amortization of past service credit		(27)	(85)
Net postretirement benefit expense	301	519	471
Current year actuarial loss (gain)	6	(3,444)	(370)
Amortization of actuarial loss	238		(31)
Amortization of prior service credit		27	85
Total recognized in other comprehensive loss	244	(3,417)	(316)
Total recognized in net postretirement expense and other comprehensive loss	$ 545	$ (2,898)	$ 155