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MORTGAGE BANKING AND OTHER SERVICED LOANS - Other Serviced Loans (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Education |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other serviced loans | $ 420 | $ 502
Commercial and Industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Other serviced loans | $ 92 | $ 94

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