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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 20,963,257 | $ 21,389,370 | $ 21,764,891 | $ 21,559,053
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 20,259,956 | $ 20,654,285 | $ 21,054,698 | $ 20,818,476
Weighted Average Interest Rate | 8.69% | 8.22% | 8.53% | 8.22%
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 675,081 | $ 723,391 | $ 682,768 | $ 728,810
Weighted Average Interest Rate | 4.01% | 3.41% | 3.76% | 3.41%
Credit Cards |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 28,220 | $ 11,694 | $ 27,425 | $ 11,767
Weighted Average Interest Rate | 4.00% | 6.64% | 3.97% | 3.71%

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