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Borrowings - Summary of Exposure Related To Unconsolidated VIEs (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Estimated Fair Value	$ 1,650,656		$ 1,933,226
Total Exposure	52,541	$ 23,890	84,568	$ 49,479	$ 32,034	$ 112,962
Variable Interest Entity, Not Primary Beneficiary | Private Education Loan term securitizations
Debt Instrument [Line Items]
Estimated Fair Value	520,987		571,795
Equity Interests	47,154		53,262
Total Exposure	$ 568,141		$ 625,057

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