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MORTGAGE BANKING AND OTHER - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 122,195 | $ 123,090
Mortgage loans serviced for others | Banking Subsidiaries |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 81,800 | $ 81,200

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