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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	$ 15,945
CumulativeEffectOnAccumulatedOtherComprehensiveIncomeNetOfTax1	(13,627)
Other comprehensive loss before reclassifications	(1,462)	$ 4,968	$ 758
Amounts reclassified from accumulated other comprehensive income	93	(784)	(480)
Net current-period other comprehensive loss	(1,369)	4,184	278
Ending balance	949	15,945
Unrealized Gains and Losses On Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	16,003	11,871	11,598
CumulativeEffectOnAccumulatedOtherComprehensiveIncomeNetOfTax1	(13,616)
Other comprehensive loss before reclassifications	(1,499)	4,922	758
Amounts reclassified from accumulated other comprehensive income	93	(790)	(485)
Net current-period other comprehensive loss	(1,406)	4,132	273
Ending balance	981	16,003	11,871
Postretirement Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	(58)	(110)	(115)
CumulativeEffectOnAccumulatedOtherComprehensiveIncomeNetOfTax1	(11)
Other comprehensive loss before reclassifications	37	46	0
Amounts reclassified from accumulated other comprehensive income	0	6	5
Net current-period other comprehensive loss	37	52	5
Ending balance	(32)	(58)	(110)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance at January 1	15,945	11,761	11,483
Ending balance	$ 949	$ 15,945	$ 11,761

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Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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Amount of the cumulative effect on other comprehensive income net of related income tax effect.

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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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