Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2023 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Average Balance | $ 20,982,244 | $ 21,290,038 | $ 21,476,000 | $ 21,820,708 |
| Private Education Loans | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Average Balance | $ 20,480,805 | $ 20,704,907 | $ 20,961,775 | $ 21,227,153 |
| Weighted Average Interest Rate | 10.91% | 10.79% | 10.96% | 10.72% |
| FFELP Loans | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Average Balance | $ 501,439 | $ 585,131 | $ 514,225 | $ 593,555 |
| Weighted Average Interest Rate | 7.73% | 7.10% | 7.48% | 6.98% |