Pension and Other Postretirement Benefits Plans - The Components of the Net Pension (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Directors' Plan [Member]
Service cost	$ 11	$ 16	$ 15
Interest cost	48	46	64
Amortization of unrecognized loss	(29)	(18)	(55)
Net postretirement benefit expense	30	44	24
Current year actuarial loss (gain)	(623)	(184)	51
Amortization of actuarial loss	(29)	(18)	(55)
Total recognized in other comprehensive loss	(594)	(166)	106
Total recognized in net postretirement expense and other comprehensive loss	(564)	(122)	130
Retirement Plan [Member]
Interest cost	553	512	652
Amortization of unrecognized loss	5	488	444
Expected return on plan assets	(1,031)	(1,096)	(1,028)
Net postretirement benefit expense	(473)	(96)	68
Current year actuarial loss (gain)	2,535	127	(54)
Amortization of actuarial loss	5	488	444
Total recognized in other comprehensive loss	2,530	(361)	(498)
Total recognized in net postretirement expense and other comprehensive loss	2,057	(457)	(430)
Other Post Retirement Benefit Plan Defined Benefit [Member]
Service cost	269	293	274
Interest cost	277	233	259
Amortization of unrecognized loss		30	0
Amortization of past service credit	(27)	(85)	(85)
Net postretirement benefit expense	519	471	448
Current year actuarial loss (gain)	(3,444)	(370)	1,599
Amortization of actuarial loss		(31)	0
Amortization of prior service credit	27	85	85
Total recognized in other comprehensive loss	(3,417)	(316)	1,684
Total recognized in net postretirement expense and other comprehensive loss	$ (2,898)	$ 155	$ 2,132