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Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables with Loan Modifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 5,571 | $ 14,809 | $ 9,005 | $ 23,995
% of Total Class of Financing Receivable | 0.03% | 0.07% | 0.04% | 0.11%
Combination - Interest Rate Reduction and Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 272,125 | $ 94,485 | $ 504,366 | $ 166,882
% of Total Class of Financing Receivable | 1.29% | 0.44% | 2.39% | 0.78%
Private Education Loans | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 5,571 | $ 14,809 | $ 9,005 | $ 23,995
% of Total Class of Financing Receivable | 0.03% | 0.07% | 0.04% | 0.11%
Private Education Loans | Interest Rate Reduction | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate | 13.31% | 13.30% | 13.25% | 13.06%
Private Education Loans | Interest Rate Reduction | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate | 3.46% | 4.00% | 3.62% | 4.00%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 272,125 | $ 94,485 | $ 504,366 | $ 166,882
% of Total Class of Financing Receivable | 1.29% | 0.44% | 2.39% | 0.78%
Weighted average life of loans | 9 years 3 months 25 days | 10 years 2 months 23 days | 9 years 3 days | 10 years 2 months 23 days
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate | 12.72% | 12.84% | 12.66% | 12.69%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average contractual rate | 3.70% | 4.00% | 3.71% | 4.00%

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