Pension and Other Postretirement Benefit Plans - Amounts Recognized In AOCI on a Pre-tax Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Actuarial loss (gain)	$ 552	$ 398	$ 1,906
Prior Service cost (credit)			(27)
Total	552	398	1,879
Retirement Plan [Member]
Net Actuarial loss (gain)	3,978	3,944	1,414
Prior Service cost (credit)	0	0	0
Total	3,978	3,944	1,414
Other Postretirement Benefits Plan [Member]
Net Actuarial loss (gain)	(2,268)	(2,512)	932
Prior Service cost (credit)	0	0	(27)
Total	(2,268)	(2,512)	905
Directors' Plan [Member]
Net Actuarial loss (gain)	(1,158)	(1,034)	(440)
Prior Service cost (credit)	0	0	0
Total	$ (1,158)	$ (1,034)	$ (440)