Employee Benefit Plans (Components of Postretirement Benefit Expense) (Details) - Postretirement Medical and Life Benefit Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 105	$ 119	$ 110
Interest Cost	35	28	41
Amortization of Prior Service Costs	(2)	(2)	2
Amortization of Unrecognized Net (Gain) Loss	43	55	64
Net Postretirement Benefit Expense	181	200	217
Net Gain (Loss) During Period Recognized in Other Comprehensive Income (Loss)	(112)	(121)	15
Total Recognized in Net Postretirement Benefit Expense and Other Comprehensive Income	$ 69	$ 79	$ 232