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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 23,188,716 | $ 23,718,632 | $ 24,220,778 | $ 23,732,858
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 21,590,905 | $ 21,748,247 | $ 22,546,874 | $ 21,740,579
Weighted Average Interest Rate | 8.33% | 9.39% | 8.60% | 9.44%
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 761,469 | $ 821,138 | $ 768,897 | $ 829,497
Weighted Average Interest Rate | 3.82% | 5.01% | 4.06% | 4.98%
Personal Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 836,342 | $ 1,149,247 | $ 905,007 | $ 1,162,782
Weighted Average Interest Rate | 12.54% | 12.00% | 12.31% | 11.90%

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