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v3.23.1

Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | $ (1,479,306) | $ (1,357,075) | $ (1,227,362) | $ (1,165,335)
Loans held for investment, net | 21,087,563 | 19,626,868 |  |
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 21,898,003 | 20,303,688 |  |
Deferred origination costs and unamortized premium/(discount) | 75,051 | 69,656 |  |
Allowance for credit losses | (1,475,379) | (1,353,631) |  |
Loans held for investment, net | 20,497,675 | 19,019,713 |  |
Private Education Loans | Fixed-rate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 12,726,875 | 11,108,079 |  |
Private Education Loans | Variable-rate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 9,171,128 | 9,195,609 |  |
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 592,318 | 609,050 |  |
Deferred origination costs and unamortized premium/(discount) | 1,497 | 1,549 |  |
Allowance for credit losses | (3,927) | (3,444) |  |
Loans held for investment, net | $ 589,888 | $ 607,155 |  |

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