Accumulated Other Comprehensive Income Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	$ 200	$ 3,226
Other comprehensive income before calculations	278	(3,241)
Amounts reclassified from accumulated other comprehensive income	160	215
Net current-period other comprehensive income	438	(3,026)
Ending balance	638	200
Unrealized Gains and Losses On Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	164	3,370
Other comprehensive income before calculations	259	(3,421)
Amounts reclassified from accumulated other comprehensive income	160	215
Net current-period other comprehensive income	419	(3,206)
Ending balance	583	164
Postretirement Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	36	(144)
Other comprehensive income before calculations	19	180
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income	19	180
Ending balance	$ 55	$ 36