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Securities Held-to-Maturity - Roll forward of Allowance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	$ 3,153
Provision for credit loss expense/(reversal)	1,872
Allowance for credit loss, Ending balance	5,025
Held-to-Maturity Securities
Changes in the allowance for credit losses
Interest income (including the amortization of discount)	3,100	$ 5,200
APL certificates
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	2,783
Provision for credit loss expense/(reversal)	547
Allowance for credit loss, Ending balance	3,330
B Piece bonds
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	370
Provision for credit loss expense/(reversal)	1,325
Allowance for credit loss, Ending balance	$ 1,695

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 50
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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

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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