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Loans Held for Investment -Narrative (Details) | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2022 USD ($) payment | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2022 USD ($) numberOfExtension payment rateReduction | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jul. 01, 2006 | Jun. 30, 2006 | Sep. 30, 1993
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private loans indexed to LIBOR | 45.00% |  |  |  | 52.00% |  |  |  |  | 45.00% | 52.00% |  |  |  |
Tier 1 of government guarantee (at least) | 97.00% |  |  |  |  |  |  |  |  | 97.00% |  |  | 97.00% |  |
Tier 2 of government guarantee |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% |
Tier 3 of government guarantee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Net proceeds from sales of personal loans, principal |  |  |  |  |  |  |  |  | $ 697,000,000 |  |  |  |  |  |
Net proceeds from personal loans, accrued interest |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |
Gains on sales of loans, net | $ 2,894,000 | $ 74,978,000 | $ 239,997,000 | $ 9,881,000 | $ 145,535,000 | $ (10,000) | $ 3,679,000 | $ 399,111,000 |  | $ 327,750,000 | $ 548,315,000 | $ 238,315,000 |  |  |
Proceeds from sale of loans receivable |  |  |  |  |  |  |  |  |  | 3,340,000,000 | 4,240,000,000 | 3,100,000,000 |  |  |
Net proceeds from sales of loans held for investment, principal |  |  |  |  |  |  |  |  |  | 3,130,000,000 | 3,980,000,000 | 2,900,000,000 |  |  |
Net proceeds from sales of loans held for investment, capitalized interest |  |  |  |  |  |  |  |  |  | $ 217,000,000 | $ 264,000,000 | $ 199,000,000 |  |  |
Estimated weighted average life of student loans |  |  |  |  |  |  |  |  |  | 5 years | 4 years 8 months 12 days |  |  |  |
Number of payments due before granting forbearance | payment | 1 |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Increment in which disaster forbearance is granted |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |
Maximum amount of forbearance granted |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |
Period of positive payment performance required by a borrower between successive grants of forbearance |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |
Number of payments required by a borrower between successive grants of forbearance | payment |  |  |  |  |  |  |  |  |  | 12 |  |  |  |  |
Period excluded from disallowance of forbearance following grace period |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |
Period that delinquent borrowers can participate in certain short-term interest-only payment alternatives, option one |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |
Period that delinquent borrowers can participate in certain short-term interest-only payment alternatives, option two |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Interest rate reduction |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty, period |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Number of available extensions of final maturity date of loan under loan modification program, borrowers facing financial difficulty | numberOfExtension |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of rate reductions available under loan modification program, borrowers facing financial difficulty | rateReduction |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 4.00% |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |
Number of consecutive monthly payments required to qualify for rate reduction, borrowers facing financial difficulty | payment |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Period of positive payment performance required by a borrower between successive grants of forbearance, borrowers facing financial difficulty |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |
Period of loans past due that have accrued interest |  |  |  |  |  |  |  |  |  | 90 days | 90 days |  |  |  |
Loans in nonaccrual status |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |
Percentage of loans concentrated in major states | 43.10% |  |  |  | 38.40% |  |  |  |  | 43.10% | 38.40% |  |  |  |
Percentage of aggregate outstanding loans held for investment |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loans held in state, less than |  |  |  |  | 500.00% |  |  |  |  |  | 500.00% |  |  |  |
Private Education Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ninety or more days delinquent | $ 135,000,000 |  |  |  | $ 80,000,000 |  |  |  |  | $ 135,000,000 | $ 80,000,000 |  |  |  |
Loans pledged to borrower in custody | 2,700,000,000 |  |  |  | 2,900,000,000 |  |  |  |  | 2,700,000,000 | 2,900,000,000 |  |  |  |
FFELP Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ninety or more days delinquent | $ 68,000,000 |  |  |  | $ 34,000,000 |  |  |  |  | $ 68,000,000 | $ 34,000,000 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increments in which forbearance is granted |  |  |  |  |  |  |  |  |  | 2 months |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 4.00% |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increments in which forbearance is granted |  |  |  |  |  |  |  |  |  | 1 month |  |  |  |  |
Personal Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan sale reduction to provision |  |  |  |  |  |  |  |  | $ 43,000,000 |  |  |  |  |  |

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