Fair Value (Narrative) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Fair Value Disclosures [Line Items]
Fair value, assets, level 1 to level 2 transfers, amount	$ 0		$ 0
Fair value, assets, level 2 to level 1 transfers, amount	0		0
Fair value, liabilities, level 1 to level 2 transfers, amount	0		0
Fair value, liabilities, level 2 to level 1 transfers, amount	0		0
Available-for-sale debt securities	103,000,000	$ 101,000,000
Gross unrealized losses on available-for-sale debt securities	2,000,000		$ 1,000,000
Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member] \| Available-for-sale Securities [Member]
Fair Value Disclosures [Line Items]
Available-for-sale debt securities	$ 35,000,000	$ 51,000,000

Fair Value Disclosures [Line Items]

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
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-Publisher FASB
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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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