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Allowance for Credit Losses and Unfunded Loan Commitments - Age Analysis of Pas Due Loans Delinquencies - Deferment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2025
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing receivable, modified in period, amount | $ 143,663 | $ 867,295 | $ 1,001,410 |
Financing receivable, modified in period, to total financing receivable, percentage | 100.00% | 100.00% | 100.00% |
Financing receivable, modified in period, subsequently charged off, amount | $ 18,500 |  | $ 40,400 | $ 50,000
Private Education Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing receivable, modified in period, amount | 145,275 | $ 900,913 | 1,035,055 |
Financing receivable, modified in period, subsequently charged off, amount | 18,500 |  |  |
Loan Deferment |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing receivable, modified in period, amount | 1,612 | 33,618 | 33,645 |
Loan delinquent, current |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing receivable, modified in period, amount | $ 48,710 | $ 692,649 | $ 826,007 |
Financing receivable, modified in period, to total financing receivable, percentage | 34.00% | 79.00% | 83.00% |
Loan delinquent 30-59 days |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing receivable, modified in period, amount | $ 43,323 | $ 76,207 | $ 77,446 |
Financing receivable, modified in period, to total financing receivable, percentage | 30.00% | 9.00% | 8.00% |
Loan delinquent 60-89 days |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing receivable, modified in period, amount | $ 26,691 | $ 48,976 | $ 43,484 |
Financing receivable, modified in period, to total financing receivable, percentage | 19.00% | 6.00% | 4.00% |
Loan delinquent 90 days or greater past due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing receivable, modified in period, amount | $ 24,939 | $ 49,463 | $ 54,473 |
Financing receivable, modified in period, to total financing receivable, percentage | 17.00% | 6.00% | 5.00% |

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