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v3.23.1

Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-Term | $ 0 | $ 0
Long-Term | 5,513,976 | 5,235,114
Total | 5,513,976 | 5,235,114
Unsecured borrowings |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 989,788 | 988,986
Total | 989,788 | 988,986
Secured Borrowings |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 4,524,188 | 4,246,128
Total | 4,524,188 | 4,246,128
Secured Borrowings | Private Education Loan term securitizations |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 4,524,188 | 4,246,128
Total | 4,524,188 | 4,246,128
Secured Borrowings | Secured Borrowing Facility |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 0 | 0
Total | 0 | 0
Secured Borrowings | Fixed-rate | Private Education Loan term securitizations |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 3,759,190 | 3,462,363
Total | 3,759,190 | 3,462,363
Secured Borrowings | Variable-rate | Private Education Loan term securitizations |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 764,998 | 783,765
Total | $ 764,998 | $ 783,765

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