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v3.25.2

Allowance for Credit Losses and Unfunded Loan Commitments - Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
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Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) payment | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jul. 01, 2006
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Monthly payment that is smaller than the interest accrued on the loan in that month |  |  | $ 25 |  |  |  |
Financing receivable allowance period increase (decrease) |  |  | $ 143,000,000 |  |  |  |
Loan sale reduction to provision |  | $ 102,751,000 |  | $ 235,955,000 |  |  |
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% |  | 97.00%
Maximum amount of forbearance granted |  |  | 12 months |  |  |  |
Number of monthly payments required by a borrower between successive grants of forbearance | payment |  |  | 12 |  |  |  |
Defaulted Amount |  |  | $ 274,584,000 |  | $ 752,880,000 | $ 1,001,410,000 |
Threshold period for payment default |  |  | 60 days |  |  |  |
Financing receivable, modified in period, subsequently charged off, amount |  |  | $ 32,200,000 |  | 57,100,000 | 40,400,000 |
Period of loans past due that have accrued interest |  |  | 90 days |  |  |  |
Private Education Loans | Extended Maturity |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financial receivable, excluding accrued interest, modified, accumulated | $ 6,100,000 |  | $ 6,100,000 |  | 6,100,000 |  |
Financial receivable, excluding accrued interest, modified in period, to total financing receivables, percentage |  |  | 0.03% |  |  |  |
Financing receivable, modified, weighted average term increase from modification |  |  | 6 years 10 months 24 days |  |  |  |
Loan delinquent 30-59 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Defaulted Amount |  |  | $ 48,282,000 |  | 73,440,000 | 77,446,000 |
Loan delinquent, current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Defaulted Amount |  |  | 167,602,000 |  | 588,873,000 | 826,007,000 |
Loan delinquent 60-89 days |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Defaulted Amount |  |  | 27,306,000 |  | 43,057,000 | 43,484,000 |
Loan delinquent 90 days or greater past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Defaulted Amount |  |  | 31,394,000 |  | 47,510,000 | 54,473,000 |
Private Education Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan sale reduction to provision |  | $ 102,751,000 | 116,459,000 | 235,955,000 |  |  |
Loans sold |  |  | 2,000,000,000 | $ 3,690,000,000 |  |  |
Defaulted Amount |  |  | $ 278,819,000 |  | $ 779,318,000 | $ 1,035,055,000 |
Threshold period when delinquent loans are written off |  |  | 120 days |  |  |  |
Financing receivable, modified in period, subsequently charged off, amount | $ 17,800,000 |  | $ 32,200,000 |  |  |  |
Maximum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Increments in which forbearance is granted |  |  | 2 months |  |  |  |
Minimum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Increments in which forbearance is granted |  |  | 1 month |  |  |  |

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