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Investment Securities - Credit Valuation Allowance for Available For Sale Debt Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- 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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- 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 + Details
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Period Type: | instant

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- 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 + Details
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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 + Details
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