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Asset-Backed Securities Issued - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
VIE, ownership interest rate |  | 80.00% |
Freddie Mac SLST | Variable Interest Entity, Primary Beneficiary |  |  |
Debt Instrument [Line Items] |  |  |
Amortized cost | $ 210,000,000 |  | $ 210,000,000
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary |  |  |
Debt Instrument [Line Items] |  |  |
VIE, ownership interest rate | 100.00% |  |
Debt instrument, face amount | $ 200,000,000 |  | 200,000,000
Debt discount | $ 4,000,000 |  | $ 4,000,000
Debt instrument interest rate | 4.75% |  | 4.75%
Asset-backed Securities | Freddie Mac SLST |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 205,000,000 |  | $ 205,000,000
Contractual maturities of over five years | Asset-backed Securities |  |  |
Debt Instrument [Line Items] |  |  |
Contractual maturities of ABS (in years) |  |  | 5 years

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685 + Details
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