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Securities Held-to-Maturity - Rollforward of Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	$ 1,644
Provision for credit loss expense/(reversal)	109
Allowance for credit loss, Ending balance	1,753	$ 1,644
Held-to-maturity securities
Changes in the allowance for credit losses
Impairment of held-to maturity securities	0
Interest income (including the amortization of discount)	13,200	9,700	$ 9,900
APL certificates
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	1,023
Provision for credit loss expense/(reversal)	399
Allowance for credit loss, Ending balance	1,422	1,023
B Piece bonds
Changes in the allowance for credit losses
Allowance for credit loss, Beginning balance	621
Provision for credit loss expense/(reversal)	(290)
Allowance for credit loss, Ending balance	$ 331	$ 621

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- Definition

Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

+ References

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-Publisher FASB
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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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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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