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Borrowings - Securities Financing Transactions (Details) - Private Education Loans - USD ($) $ in Thousands	Aug. 21, 2025	Jul. 17, 2025
SMB Private Education Loan Trust 2025-B
Line of Credit Facility [Line Items]
Loans Transferred to the Trust by Third-Party Seller		$ 496,749
Additional Loans the Bank Transferred to the Trust		26,223
Gain on Sale for Additional Loans Transferred by Bank		$ 2,315
SMB Private Education Loan Trust 2025-C
Line of Credit Facility [Line Items]
Loans Transferred to the Trust by Third-Party Seller	$ 1,807,961
Additional Loans the Bank Transferred to the Trust	95,101
Gain on Sale for Additional Loans Transferred by Bank	$ 5,353

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