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Borrowings - Secured Financing (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2022 | Nov. 30, 2021 | Aug. 31, 2021 | May 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |  |
Total Issued |  |  |  |  | $ 575,000,000 | $ 1,592,000,000
Total loans and accrued interest amount securitized at inception |  |  |  |  | 674,387,000 | $ 1,656,263,000
2021-B |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total Issued |  |  |  | $ 531,000,000 |  |
Weighted Average Life (in years) |  |  |  | 4 years 3 months 3 days |  |
Principal amount of collateral |  |  |  |  | 389,000,000 |
Capitalized interest |  |  |  |  | 21,000,000 |
2021-B | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.77% |  |
2021-D |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total Issued |  |  | $ 527,000,000 |  |  |
Weighted Average Life (in years) |  |  | 4 years 2 months 19 days |  |  |
Loans |  |  |  |  | 425,000,000 |
Principal amount of collateral |  |  |  |  | 403,000,000 |
Capitalized interest |  |  |  |  | 22,000,000 |
2021-D | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.69% |  |  |
2021-E |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total Issued |  | $ 534,000,000 |  |  |  |
Weighted Average Life (in years) |  | 4 years 1 month 24 days |  |  |  |
Loans |  |  |  |  | 439,000,000 |
Principal amount of collateral |  |  |  |  | 416,000,000 |
Capitalized interest |  |  |  |  | 23,000,000 |
2021-E | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 0.69% |  |  |  |
SMB Private Education Loan Trust 2022-C |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total Issued | $ 575,000,000 |  |  |  |  |
Weighted Average Life (in years) | 4 years 8 months 8 days |  |  |  |  |
Principal amount of collateral |  |  |  |  | 597,000,000 |
Capitalized interest |  |  |  |  | 38,000,000 |
SMB Private Education Loan Trust 2022-C | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.76% |  |  |  |  |
Private Education Loans Securitized in 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loans |  |  |  |  | 1,270,000,000 |
Principal amount of collateral |  |  |  |  | 1,210,000,000 |
Capitalized interest |  |  |  |  | 66,000,000 |
Private Education Loans Securitized in 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loans |  |  |  |  | 635,000,000 |
Principal amount of collateral |  |  |  |  | 597,000,000 |
Capitalized interest |  |  |  |  | $ 38,000,000 |

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