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Borrowings - Summary of Exposure Related To Unconsolidated VIEs (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Estimated Fair Value	$ 1,775,784		$ 1,933,226
Total Exposure	97,877	$ 52,541	84,568	$ 91,959	$ 49,479	$ 112,962
Variable Interest Entity, Not Primary Beneficiary | Private Education Loan term securitizations
Debt Instrument [Line Items]
Estimated Fair Value	643,446		571,795
Equity Interests	51,963		53,262
Total Exposure	$ 695,409		$ 625,057

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