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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 22,916,916 | $ 21,969,756
Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 22,916,916 | $ 21,442,744
Weighted Average Interest Rate | 10.59% | 11.01%
FFELP Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 0 | $ 527,012
Weighted Average Interest Rate | 0.00% | 7.24%

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