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Investments - Impairment Losses on Held-to-maturity Security - Narrative (Details)	6 Months Ended
	Jun. 30, 2018 USD ($)
Investments Debt And Equity Securities [Abstract]
Cumulative impairment loss held-to-maturity security	$ 0

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- References

No definition available.

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- Definition

Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562

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