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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 21,534,883 | $ 21,613,919 | $ 21,238,931
Private Education Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 21,121,545 | $ 21,039,701 | $ 20,576,737
Weighted Average Interest Rate | 10.81% | 10.86% | 9.14%
FFELP Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 413,338 | $ 574,218 | $ 662,194
Weighted Average Interest Rate | 7.45% | 7.19% | 4.62%

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