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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, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	$ 4,326	$ 3,100
Other comprehensive loss before reclassifications	(1,085)	879
Amounts reclassified from accumulated other comprehensive income	(15)	347
Net current-period other comprehensive loss	(1,100)	1,226
Ending balance	3,226	4,326
Unrealized Gains and Losses On Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	4,470	3,132
Other comprehensive loss before reclassifications	(1,085)	991
Amounts reclassified from accumulated other comprehensive income	(15)	347
Net current-period other comprehensive loss	(1,100)	1,338
Ending balance	3,370	4,470
Postretirement Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	(144)	(32)
Other comprehensive loss before reclassifications	0	(112)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive loss	0	(112)
Ending balance	$ (144)	$ (144)

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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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