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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
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 3,100
Other comprehensive income	12	$ 1,143
Ending balance	3,112
Unrealized Gains and Losses On Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	3,132	981
Other comprehensive income before reclassifications	(304)	1,143
Amounts reclassified from accumulated other comprehensive income	348	0
Other comprehensive income	44	1,143
Ending balance	3,176	2,124
Postretirement Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(32)	(32)
Other comprehensive income before reclassifications	(32)	0
Amounts reclassified from accumulated other comprehensive income	0	0
Other comprehensive income	(32)	0
Ending balance	(64)	(32)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	3,100	949
Other comprehensive income before reclassifications	(336)	1,143
Amounts reclassified from accumulated other comprehensive income	348	0
Other comprehensive income	12	1,143
Ending balance	$ 3,112	$ 2,092

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

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