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Securities Held-to-Maturity Rollforward of Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	$ 1,597		$ 1,644
Provision for credit loss expense	518		471
Allowance for credit loss, Ending balance	2,115		2,115
Impairment of held-to maturity securities			0
Held-to-Maturity
Changes in the allowance for credit losses
Interest income (including the amortization of discount)	3,100	$ 1,700	6,000	$ 4,000
APL certificates
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	991		1,023
Provision for credit loss expense	577		545
Allowance for credit loss, Ending balance	1,568		1,568
B Piece bonds
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	606		621
Provision for credit loss expense	(59)		(74)
Allowance for credit loss, Ending balance	$ 547		$ 547

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
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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.

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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

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-Publisher FASB
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- Definition

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

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Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings and other comprehensive income (OCI).

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