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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 3,226
Other comprehensive loss	$ (1,171)	$ (333)	(3,977)	$ (854)
Ending balance	(751)		(751)
Unrealized Gains and Losses On Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	397	3,949	3,370	4,470
Other comprehensive income before calculations	(1,257)	(342)	(4,364)	(839)
Amounts reclassified from accumulated other comprehensive income	73	9	207	(15)
Other comprehensive loss	(1,184)	(333)	(4,157)	(854)
Ending balance	(787)	3,616	(787)	3,616
Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	23	(144)	(144)	(144)
Other comprehensive income before calculations	13	0	180	0
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other comprehensive loss	13	0	180	0
Ending balance	36	(144)	36	(144)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	420	3,805	3,226	4,326
Other comprehensive income before calculations	(1,244)	(342)	(4,184)	(839)
Amounts reclassified from accumulated other comprehensive income	73	9	207	(15)
Other comprehensive loss	(1,171)	(333)	(3,977)	(854)
Ending balance	$ (751)	$ 3,472	$ (751)	$ 3,472

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Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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