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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 21,701,229 | $ 23,776,111 | $ 24,181,174
Private Education Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 20,968,061 | $ 22,426,216 | $ 22,225,473
Weighted Average Interest Rate | 8.25% | 8.42% | 9.32%
FFELP Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 718,186 | $ 757,953 | $ 814,198
Weighted Average Interest Rate | 3.43% | 3.76% | 4.79%
Personal Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 0 | $ 582,552 | $ 1,141,503
Weighted Average Interest Rate | 0.00% | 12.43% | 12.09%
Credit Cards |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 14,982 | $ 9,390 | $ 0
Weighted Average Interest Rate | 4.67% | (6.04%) | 0.00%

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