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Securities Available for Sale - Schedule of Activity in Credit Valuation Allowance for AFS Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Other asset-backed securities related to Structured Program transactions: |  |  |  |
Allowance for credit losses, beginning of period |  |  | $ 4,093 |
Allowance for credit losses, end of period | $ 3,981 |  | 3,981 |
Other asset-backed securities related to Structured Program transactions |  |  |  |
Other asset-backed securities related to Structured Program transactions: |  |  |  |
Allowance for credit losses, beginning of period | 3,816 | $ 4,848 | 4,093 | $ 3,527
Credit loss expense (benefit) for securities available for sale | 165 | (819) | (112) | 502
Allowance for credit losses, end of period | $ 3,981 | $ 4,029 | $ 3,981 | $ 4,029

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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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- 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
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