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Allowance for Credit Losses - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 01, 2006
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Less: provisions for credit losses |  |  |  |  |  |  |  |  | $ (232,708,000) | $ 190,898,000 |  |
Decrease to provisions |  |  |  |  |  |  |  |  | 126,000,000 |  |  |
Proceeds from sale of loans receivable |  |  |  |  |  |  |  |  | $ 4,240,000,000 | $ 3,100,000,000 |  |
Interest rate offered to borrowers facing financial difficulty | 4.00% |  |  |  |  |  |  |  | 4.00% |  |  |
Interest rate offered to borrowers facing financial difficulty, period |  |  |  |  |  |  |  |  | 2 years |  |  |
Percentage of loans in full and interest repayment status that are subject to interest rate reductions | 7.20% |  |  |  | 7.80% |  |  |  | 7.20% | 7.80% |  |
Percentage of loans granted forbearance (as a percentage) | 47.00% |  |  |  | 47.00% |  |  |  | 47.00% | 47.00% |  |
Criteria for loans to be considered as nonperforming |  |  |  |  |  |  |  |  | 90 days |  |  |
Tier 1 of government guarantee (at least) |  |  |  |  |  |  |  |  |  |  |  | 97.00%
TDR payment default period |  |  |  |  |  |  |  |  | 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 |  |  |
Less: provisions for credit losses | $ (15,309,000) | $ 138,442,000 | $ 69,677,000 | $ (225,767,000) | $ (316,372,000) | $ (3,640,000) | $ 351,887,000 | $ 61,258,000 | (32,957,000) | $ 93,133,000 | $ 354,249,000 |
Private Education Loans |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Less: provisions for credit losses |  |  |  |  |  |  |  |  | (233,852,000) | 148,673,000 |  |
Less: provisions for credit losses |  |  |  |  |  |  |  |  | (34,101,000) | 93,824,000 |  |
FFELP Loans |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Less: provisions for credit losses |  |  |  |  |  |  |  |  | $ 20,000 | $ 412,000 |  |
Tier 1 of government guarantee (at least) | 97.00% |  |  |  |  |  |  |  | 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 | 4.00% |  |  |  |  |  |  |  | 4.00% |  |  |

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