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Fair Value - Narrative (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Material gains (losses) on available for sale debt securities	$ 0	$ 0	$ 0

X

- Definition

Amount, before tax, of unrealized gain (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

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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