Supplemental Compensation Plans, Components of Net Periodic Benefit Cost and Additional Information (Details) - Pension Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Salary Continuation Plan and SERP [Member]
Components of net periodic benefit cost [Abstract]
Service cost	$ 158	$ 278
Interest cost	263	175
Amortization of prior service cost	2	2
Recognized actuarial loss (gain)	0	130
Net periodic benefit cost	423	585
Additional Information [Abstract]
Minimum benefit obligation at year end	4,979	5,339	$ 6,581
Decrease in minimum liability included in other comprehensive loss	(338)	(1,555)
Directors' Retirement Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	0	0
Interest cost	24	14
Recognized actuarial loss (gain)	(4)	0
Net periodic benefit cost	20	14
Additional Information [Abstract]
Minimum benefit obligation at year end	424	560	$ 710
Decrease in minimum liability included in other comprehensive loss	$ (96)	$ (94)