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Securities Held-to-Maturity Rollforward of Allowance (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for credit loss | $ 992 |  | $ 0 |
Provision for credit loss expense | 2,156 |  | 2,647 |
Allowance for credit loss, ending balance | 3,148 |  | 3,148 |
Impairment of held-to maturity securities |  |  | 0 |
Accrued interest, held-to-maturity securities | 600 |  | 600 |
Held-to-Maturity |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Investment Income, Interest | 1,700 | $ 2,300 | 4,000 | $ 4,400
APL certificates |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit loss expense | 2,079 |  | 2,079 |
Allowance for credit loss, ending balance | 2,079 |  | 2,079 |
B Piece bonds |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for credit loss | 992 |  |  |
Provision for credit loss expense | 77 |  | 568 |
Allowance for credit loss, ending balance | 1,069 |  | 1,069 |
Impact of adopting CECL | Impact of Adoption |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for credit loss, ending balance | 501 |  | 501 |
Impact of adopting CECL | Impact of Adoption | B Piece bonds |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for credit loss, ending balance | $ 501 |  | $ 501 |

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- Definition Amount of accrued interest on held to maturity securities. + References No definition available. + Details
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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=121599337&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=121645371&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=121599878&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=121599337&loc=SL82919249-210447 + 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=121599337&loc=SL82919249-210447 + Details
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