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Allowance for Credit Losses -Narrative (Details) | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) payment | Dec. 31, 2022 USD ($) | Jul. 01, 2006
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expense (reversal) financial receivable and off-balance sheet | $ 15,599,000 | $ 198,023,000 | $ 17,729,000 | $ 114,112,000 | $ 297,260,000 | $ 207,598,000 | $ 30,545,000 | $ 98,050,000 | $ 345,000,000 | $ 633,000,000 |
Criteria for loans to be considered as nonperforming (greater than) |  |  |  |  |  |  |  |  | 90 days |  |
Tier 1 of government guarantee (at least) | 97.00% |  |  |  |  |  |  |  | 97.00% |  | 97.00%
Maximum amount of forbearance granted |  |  |  |  |  |  |  |  | 12 months |  |
Number of monthly payments required by a borrower between successive grants of forbearance | payment |  |  |  |  |  |  |  |  | 12 |  |
Threshold period for payment default |  |  |  |  |  |  |  |  | 60 days |  |
Period of loans past due that have accrued interest |  |  |  |  |  |  |  |  | 90 days | 90 days |
Monthly payment that is smaller than the interest accrued on the loan in that month |  |  |  |  |  |  |  |  | $ 25 |  |
Private Education Loans |  |  |  |  |  |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans sold |  |  |  |  |  |  |  |  | $ 3,150,000,000 | $ 3,340,000,000 |
Threshold period when delinquent loans are written off |  |  |  |  |  |  |  |  | 120 days |  |
FFELP Loans |  |  |  |  |  |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of FFELP loans insured and guaranteed (at least) |  |  |  |  |  |  |  |  | 97.00% |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 8.00% |  |  |  |  |  |  |  | 8.00% |  |
Increments in which forbearance is granted |  |  |  |  |  |  |  |  | 2 months |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 2.00% |  |  |  |  |  |  |  | 2.00% |  |
Increments in which forbearance is granted |  |  |  |  |  |  |  |  | 1 month |  |

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