Pension and Other Postretirement Benefits - The Components of the Net Pension (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Directors' Plan [Member]
Service cost	$ 16	$ 15	$ 39
Interest cost	46	64	86
Amortization of actuarial (gain) loss	(18)	(55)	(141)
Net pension expense (benefit)	44	24	(16)
Current year actuarial loss (gain)	(184)	51	44
Total recognized in other comprehensive income	(166)	106	185
Total recognized in net pension cost (benefit) and other comprehensive loss	(122)	130	169
Amortization of actuarial gain (loss)	(18)	(55)	(141)
Retirement Plan [Member]
Interest cost	512	652	797
Amortization of actuarial (gain) loss	488	444	269
Expected return on plan assets	(1,096)	(1,028)	(1,088)
Net pension expense (benefit)	(96)	68	(22)
Current year actuarial loss (gain)	127	(54)	(696)
Total recognized in other comprehensive income	(361)	(498)	(965)
Total recognized in net pension cost (benefit) and other comprehensive loss	(457)	(430)	(987)
Amortization of actuarial gain (loss)	488	444	269
Other Post Retirement Benefit Plan Defined Benefit [Member]
Service cost	293	274	280
Interest cost	233	259	341
Amortization of actuarial (gain) loss	30		0
Amortization of past service credit	(85)	(85)	(85)
Net pension expense (benefit)	471	448	536
Current year actuarial loss (gain)	(370)	1,599	(301)
Total recognized in other comprehensive income	(316)	1,684	(216)
Total recognized in net pension cost (benefit) and other comprehensive loss	155	2,132	320
Amortization of prior service credit	85	$ 85	85
Amortization of actuarial gain (loss)	$ (31)		$ 0