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Allowance for Credit Losses and Unfunded Loan Commitments - Amortized Cost Basis of Financing Receivables that Subsequently Defaulted (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Defaulted Amount |  |  | $ 274,584 |  | $ 752,880 | $ 1,001,410
Private Education Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Defaulted Amount |  |  | 278,819 |  | $ 779,318 | $ 1,035,055
Private Education Loans | 60 Days or Greater Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Defaulted Amount | $ 52,536 | $ 26,760 | 83,313 | $ 40,128 |  |
Period-end Amortized Cost Basis | 47,432 | 27,322 | 70,160 | 39,634 |  |
Private Education Loans | Interest Rate Reduction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Defaulted Amount | 2,503 | 1,569 | 3,887 | 2,290 |  |
Period-end Amortized Cost Basis | 2,222 | 1,592 | 3,196 | 2,110 |  |
Private Education Loans | Combination - Interest Rate Reduction and Term Extension |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Defaulted Amount | 50,033 | 25,191 | 79,426 | 37,838 |  |
Period-end Amortized Cost Basis | $ 45,210 | $ 25,730 | $ 66,964 | $ 37,524 |  |

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