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Investments in Securities - Credit Losses Recognized on Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments in Securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	$ 0	$ 0	$ 0

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- References

No definition available.

+ Details

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Balance Type:	na
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- Definition

This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL6284393-111563

+ Details

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