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Securities Held-To-Maturity - Rollforward of Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	$ 9,132	$ 4,534	$ 6,256	$ 3,153
Provision for credit loss expense/(reversal)	1,432	1,409	4,308	2,790
Allowance for credit loss, Ending balance	10,564	5,943	10,564	5,943
APL certificates
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	2,290	3,375	2,272	2,783
Provision for credit loss expense/(reversal)	(459)	(1,035)	(441)	(443)
Allowance for credit loss, Ending balance	1,831	2,340	1,831	2,340
B Piece bonds
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	6,842	1,159	3,984	370
Provision for credit loss expense/(reversal)	1,891	2,444	4,749	3,233
Allowance for credit loss, Ending balance	$ 8,733	$ 3,603	$ 8,733	$ 3,603

X

- 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

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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X

- 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

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