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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 24,141,470 | $ 21,254,774 | $ 23,870,559 | $ 20,617,890
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 22,202,420 | $ 19,295,318 | $ 21,896,218 | $ 18,908,929
Weighted Average Interest Rate | 9.30% | 9.16% | 9.40% | 9.01%
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 806,865 | $ 877,279 | $ 821,870 | $ 898,208
Weighted Average Interest Rate | 4.54% | 4.65% | 4.83% | 4.47%
Personal Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 1,132,185 | $ 1,082,177 | $ 1,152,471 | $ 810,753
Weighted Average Interest Rate | 12.16% | 11.03% | 11.99% | 10.82%

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