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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 21,672,992 | $ 23,226,973 | $ 21,597,450 | $ 23,891,957
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 20,944,581 | $ 21,937,758 | $ 20,860,973 | $ 22,342,353
Weighted Average Interest Rate | 8.26% | 8.24% | 8.23% | 8.48%
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 713,517 | $ 750,925 | $ 723,656 | $ 762,863
Weighted Average Interest Rate | 3.45% | 3.46% | 3.43% | 3.86%
Personal Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 0 | $ 527,204 | $ 0 | $ 778,153
Weighted Average Interest Rate | 0.00% | 12.86% | 0.00% | 12.43%
Credit Cards |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 14,894 | $ 11,086 | $ 12,821 | $ 8,588
Weighted Average Interest Rate | 6.95% | (6.58%) | 4.97% | (7.20%)

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