Accumulated Other Comprehensive Income Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 200
Other Comprehensive Income (Loss), Net of Tax, Total	$ (916)	$ (1,171)	(955)	$ (3,977)
Ending balance	(755)		(755)
Unrealized Gains and Losses On Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	19	397	164	3,370
Other comprehensive (loss) income before calculations	(984)	(1,257)	(1,215)	(4,364)
Amounts reclassified from accumulated other comprehensive income	74	73	160	207
Other Comprehensive Income (Loss), Net of Tax, Total	(910)	(1,184)	(1,055)	(4,157)
Ending balance	(891)	(787)	(891)	(787)
Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	142	23	36	(144)
Other comprehensive (loss) income before calculations	(6)	13	100	180
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	(6)	13	100	180
Ending balance	136	36	136	36
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	161	420	200	3,226
Other comprehensive (loss) income before calculations	(990)	(1,244)	(1,115)	(4,184)
Amounts reclassified from accumulated other comprehensive income	74	73	160	207
Other Comprehensive Income (Loss), Net of Tax, Total	(916)	(1,171)	(955)	(3,977)
Ending balance	$ (755)	$ (751)	$ (755)	$ (751)