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MORTGAGE BANKING - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
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Participating Mortgage Loans [Line Items] |  |  |
MSR portfolio fair value | $ 563 | $ 600 |
Residential mortgages |  |  |
Participating Mortgage Loans [Line Items] |  |  |
MSR portfolio fair value | $ 563 | $ 600 | $ 0

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