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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 23,215,887 | $ 24,141,470 | $ 23,883,369 | $ 23,870,559
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 21,937,758 | $ 22,202,420 | $ 22,342,353 | $ 21,896,218
Weighted Average Interest Rate | 8.24% | 9.30% | 8.48% | 9.40%
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 750,925 | $ 806,865 | $ 762,863 | $ 821,870
Weighted Average Interest Rate | 3.46% | 4.54% | 3.86% | 4.83%
Personal Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 527,204 | $ 1,132,185 | $ 778,153 | $ 1,152,471
Weighted Average Interest Rate | 12.86% | 12.16% | 12.43% | 11.99%

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