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Securities Held-to-Maturity - Rollforward of Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 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) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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