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Investment Securities - Credit Valuation Allowance for Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Debt securities, allowance for credit loss, beginning balance | $ 3,952 | $ 578
Credit losses on securities for which credit losses were not previously recorded | 502 | 1,383
Credit losses on previously impaired securities | 648 | 273
Decrease in allowance for credit losses on previously impaired securities | (33) | (61)
Debt securities, allowance for credit loss, ending balance | 5,069 | 2,173
Asset-backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Debt securities, allowance for credit loss, beginning balance | 483 | 578
Credit losses on securities for which credit losses were not previously recorded | 0 | 0
Credit losses on previously impaired securities | 0 | 273
Decrease in allowance for credit losses on previously impaired securities | (33) | (61)
Debt securities, allowance for credit loss, ending balance | 450 | 790
Corporate notes |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Debt securities, allowance for credit loss, beginning balance | 3,469 | 0
Credit losses on securities for which credit losses were not previously recorded | 502 | 1,383
Credit losses on previously impaired securities | 648 | 0
Decrease in allowance for credit losses on previously impaired securities | 0 | 0
Debt securities, allowance for credit loss, ending balance | $ 4,619 | $ 1,383

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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 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 + Details
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