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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Short-Term	$ 0	$ 0
Long-Term	6,838,995	6,440,345
Total	6,838,995	6,440,345
Unsecured borrowings
Debt Instrument [Line Items]
Short-Term	0	0
Long-Term	990,956	995,420
Total	990,956	995,420
Secured Borrowings
Debt Instrument [Line Items]
Short-Term	0	0
Long-Term	5,848,039	5,444,925
Total	5,848,039	5,444,925
Secured Borrowings | Private Education Loan term securitizations
Debt Instrument [Line Items]
Short-Term	0	0
Long-Term	5,148,039	5,444,925
Total	5,148,039	5,444,925
Secured Borrowings | Secured Borrowing Facility
Debt Instrument [Line Items]
Short-Term	0	0
Long-Term	700,000	0
Total	700,000	0
Secured Borrowings | Fixed-rate | Private Education Loan term securitizations
Debt Instrument [Line Items]
Short-Term	0	0
Long-Term	4,404,267	4,617,743
Total	4,404,267	4,617,743
Secured Borrowings | Variable-rate | Private Education Loan term securitizations
Debt Instrument [Line Items]
Short-Term	0	0
Long-Term	743,772	827,182
Total	$ 743,772	$ 827,182

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