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Securities Held-To-Maturity - Rollforward of Allowance (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Changes in the allowance for credit losses |  |  |  |
Allowance for credit loss, Beginning balance | $ 7,597 | $ 5,025 | $ 6,256 | $ 3,153
Provision for credit loss expense/(reversal) | 1,535 | (491) | 2,876 | 1,381
Allowance for credit loss, Ending balance | 9,132 | 4,534 | 9,132 | 4,534
APL certificates |  |  |  |
Changes in the allowance for credit losses |  |  |  |
Allowance for credit loss, Beginning balance | 2,157 | 3,330 | 2,272 | 2,783
Provision for credit loss expense/(reversal) | 133 | 45 | 18 | 592
Allowance for credit loss, Ending balance | 2,290 | 3,375 | 2,290 | 3,375
B Piece bonds |  |  |  |
Changes in the allowance for credit losses |  |  |  |
Allowance for credit loss, Beginning balance | 5,440 | 1,695 | 3,984 | 370
Provision for credit loss expense/(reversal) | 1,402 | (536) | 2,858 | 789
Allowance for credit loss, Ending balance | $ 6,842 | $ 1,159 | $ 6,842 | $ 1,159

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + 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 of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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