Pension and Other Postretirement Benefit Plans - Amounts Recognized In AOCI on a Pre-tax Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Actuarial loss (gain)	$ 398	$ 1,906	$ 2,834
Prior Service cost (credit)		(27)	(112)
Total	398	1,879	2,722
Retirement Plan [Member]
Net Actuarial loss (gain)	3,944	1,414	1,775
Prior Service cost (credit)	0	0	0
Total	3,944	1,414	1,775
Other Postretirement Benefits Plan [Member]
Net Actuarial loss (gain)	(2,512)	932	1,333
Prior Service cost (credit)	0	(27)	(112)
Total	(2,512)	905	1,221
Directors' Plan [Member]
Net Actuarial loss (gain)	(1,034)	(440)	(274)
Prior Service cost (credit)	0	0	0
Total	$ (1,034)	$ (440)	$ (274)