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Investment Securities - Credit Valuation Allowance for Available For Sale Debt Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance at January 1	$ 578	$ 0
Credit losses on securities for which credit losses were not previously recorded	3,860	578
Decrease in allowance for credit losses on previously impaired securities	(95)	0
Reduction due to sales	(391)	0
Balance at December 31	3,952	578
Asset-backed securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance at January 1	578	0
Credit losses on securities for which credit losses were not previously recorded	0	578
Decrease in allowance for credit losses on previously impaired securities	(95)	0
Reduction due to sales	0	0
Balance at December 31	483	578
Corporate notes
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance at January 1	0	0
Credit losses on securities for which credit losses were not previously recorded	3,860	0
Decrease in allowance for credit losses on previously impaired securities	0	0
Reduction due to sales	(391)	0
Balance at December 31	$ 3,469	$ 0

X

- Definition

Debt Securities, Available-For-Sale, Excluding Accrued Interest, Allowance For Credit Loss, Decrease On Previously Impaired Securities

+ References

No definition available.

+ Details

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Amount excluding accrued interest, of allowance for credit loss on 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://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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X

- Definition

Amount, excluding accrued interest, of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with no credit loss previously recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

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