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Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables with Loan Modifcations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 48,637 |  | $ 30,569 |
% of Total Class of Financing Receivable | 0.22% |  | 0.14% |
Combination - Interest Rate Reduction and Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 331,889 | $ 295,547 |  |
% of Total Class of Financing Receivable | 1.48% | 1.37% |  |
Private Education Loans | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 48,637 |  | $ 30,569 |
% of Total Class of Financing Receivable | 0.22% |  | 0.14% |
Private Education Loans | Interest Rate Reduction | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate |  |  | 13.37% | 11.12%
Private Education Loans | Interest Rate Reduction | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate |  |  | 4.00% | 4.00%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 331,889 | $ 295,547 |  |
% of Total Class of Financing Receivable | 1.48% | 1.37% |  |
Weighted average life of loans |  |  | 10 years 2 months 12 days | 10 years 4 months 24 days
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate |  |  | 12.92% | 10.57%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate |  |  | 4.00% | 4.00%

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