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MORTGAGE BANKING AND OTHER SERVICED LOANS - Other Serviced Loans (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Education |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other serviced loans | $ 358 | $ 420
Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other serviced loans | $ 88 | $ 92

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