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, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	$ 3,226	$ 4,326
Other comprehensive (loss) income before calculations	(3,241)	(1,085)
Amounts reclassified from accumulated other comprehensive income	215	(15)
Net current-period other comprehensive (loss) income	(3,026)	(1,100)
Ending balance	200	3,226
Unrealized Gains and Losses On Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	3,370	4,470
Other comprehensive (loss) income before calculations	(3,421)	(1,085)
Amounts reclassified from accumulated other comprehensive income	215	(15)
Net current-period other comprehensive (loss) income	(3,206)	(1,100)
Ending balance	164	3,370
Postretirement Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	(144)	(144)
Other comprehensive (loss) income before calculations	180	0
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive (loss) income	180	0
Ending balance	$ 36	$ (144)