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Loans Held for Investment - Schedule of Allowance for Credit Losses and Recorded Investments in Loans (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gains on sales of loans, net | $ 187,735 | $ 143,039
Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan principal | 1,840 | 1,952
Capitalized interest | 163 | 151
Total Private Education Loans sold | 2,003 | 2,103
Gains on sales of loans, net | $ 188 | $ 143

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