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Borrowings - Secured Financing (Details) - USD ($) $ in Thousands					1 Months Ended				9 Months Ended	12 Months Ended
	May 07, 2025	Nov. 06, 2024	Aug. 14, 2024	Mar. 15, 2024	May 31, 2025	Nov. 30, 2024	Aug. 31, 2024	May 31, 2024	Sep. 30, 2025	Dec. 31, 2024
Securities Financing Transaction [Line Items]
Loans Transferred to the Trust									$ 561,734	$ 2,158,665
2024-C ABS Transaction
Securities Financing Transaction [Line Items]
Loans Transferred to the Trust								$ 733,644
Notes Issued								$ 668,000
Gross Proceeds				$ 667,888
Weighted Average Cost of Funds (as a percent)								1.19%
Weighted Average Life of Notes (in years)								5 years 4 months 9 days
2024-E ABS Transaction
Securities Financing Transaction [Line Items]
Loans Transferred to the Trust							$ 944,645
Notes Issued							$ 868,000
Gross Proceeds			$ 867,743
Weighted Average Cost of Funds (as a percent)							1.42%
Weighted Average Life of Notes (in years)							5 years 2 months 1 day
2024-F ABS Transaction
Securities Financing Transaction [Line Items]
Loans Transferred to the Trust						$ 732,445
Notes Issued						$ 680,000
Gross Proceeds		$ 679,981
Weighted Average Cost of Funds (as a percent)						1.08%
Weighted Average Life of Notes (in years)						5 years 1 month 2 days
SMB Private Education Loan Trust 2024
Securities Financing Transaction [Line Items]
Loans Transferred to the Trust										2,410,734
Notes Issued										2,216,000
Gross Proceeds										$ 2,215,612
2025-A ABS Transaction
Securities Financing Transaction [Line Items]
Loans Transferred to the Trust	$ 576,908
Notes Issued	539,000
Gross Proceeds	$ 538,889
Weighted Average Cost of Funds (as a percent)	1.49%
Weighted Average Life of Notes (in years)					5 years 5 months 15 days
SMB Private Education Loan Trust 2025
Securities Financing Transaction [Line Items]
Loans Transferred to the Trust									576,908
Notes Issued									539,000
Gross Proceeds									$ 538,889

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