Investments (Realized Gains (Losses)) (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Gain (Loss) on Securities [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	$ 1,084	$ 0	$ 1,084	$ 508
Proceeds from Sale and Maturity of Marketable Securities	$ 0		$ 0
Proceeds from Sale of Available-For-Sale Securities, Equity		$ 0		$ 1,940
Sale of bonds, number of available-for-sale securities sold	1	0	1	1
Number of Equity Securities Sold	0	0	0	0
Sale of bonds, number of held-to-maturity bonds sold	0	0	0	0
Debt Securities [Member]
Gain (Loss) on Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains	$ 54	$ 0	$ 53	$ 6
Available-for-sale Securities, Gross Realized Losses	0	0	0	0
Equity Securities [Member]
Gain (Loss) on Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains		0		0
Equity Securities, FV-NI, Realized Gain	0		0
Available-for-sale Securities, Gross Realized Losses		$ 0		$ 30
Equity Securities, FV-NI, Realized Loss	$ 0		$ 0

Number of Equity Securities Sold

No definition available.

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- Definition

The number of securities classified as held-to-maturity sold by the Company.

+ References

No definition available.

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The number of securities classified as available-for-sale sold by the Company.

+ References

No definition available.

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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- Definition

Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714

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Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

No definition available.

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- Definition

Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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