Accumulated Other Comprehensive Income Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 200
Other Comprehensive Income (Loss), Net of Tax, Total	$ (399)	$ (798)	(39)	$ (2,806)
Ending balance	161		161
Unrealized Gains and Losses On Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	413	1,189	164	3,370
Other comprehensive (loss) income before calculations	(417)	(926)	(231)	(3,107)
Amounts reclassified from accumulated other comprehensive income	23	134	86	134
Other Comprehensive Income (Loss), Net of Tax, Total	(394)	(792)	(145)	(2,973)
Ending balance	19	397	19	397
Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	147	29	36	(144)
Other comprehensive (loss) income before calculations	(5)	(6)	106	167
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	(5)	(6)	106	167
Ending balance	142	23	142	23
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	560	1,218	200	3,226
Other comprehensive (loss) income before calculations	(422)	(932)	(125)	(2,940)
Amounts reclassified from accumulated other comprehensive income	23	134	86	134
Other Comprehensive Income (Loss), Net of Tax, Total	(399)	(798)	(39)	(2,806)
Ending balance	$ 161	$ 420	$ 161	$ 420