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Investment Securities - Credit Valuation Allowance for Available For Sale Debt Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt securities, allowance for credit loss, beginning balance	$ 3,439	$ 411	$ 578	$ 0
Credit losses on securities for which credit losses were not previously recorded	564	0	2,485	253
Credit losses on previously impaired securities	511	0	1,488	0
Decrease in allowance for credit losses on previously impaired securities	(274)	(158)	(311)	0
Reduction due to sales	(391)	0	(391)	0
Debt securities, allowance for credit loss, ending balance	3,849	253	3,849	253
Asset-backed securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt securities, allowance for credit loss, beginning balance	1,563	411	578	0
Credit losses on securities for which credit losses were not previously recorded	0	0	0	253
Credit losses on previously impaired securities	442	0	1,488	0
Decrease in allowance for credit losses on previously impaired securities	(250)	(158)	(311)	0
Reduction due to sales	0	0	0	0
Debt securities, allowance for credit loss, ending balance	1,755	253	1,755	253
Corporate notes
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Debt securities, allowance for credit loss, beginning balance	1,876	0	0	0
Credit losses on securities for which credit losses were not previously recorded	564	0	2,485	0
Credit losses on previously impaired securities	69	0	0	0
Decrease in allowance for credit losses on previously impaired securities	(24)	0	0	0
Reduction due to sales	(391)	0	(391)	0
Debt securities, allowance for credit loss, ending balance	$ 2,094	$ 0	$ 2,094	$ 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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Period Type:	duration

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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- 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 credit loss expense (reversal of expense) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with previously recorded allowance and not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis.

+ References

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

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X

- 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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