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Subsequent Events (Details) - Subsequent Event - USD ($) $ in Millions | Feb. 28, 2019 | Feb. 01, 2019 | Jan. 03, 2019
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Pacific Union Financial, LLC |  |  |
Subsequent Event [Line Items] |  |  |
Purchase price from cash payment |  | $ 128 |
Seterus Mortgage Servicing Platform And Related IBM Assets |  |  |
Subsequent Event [Line Items] |  |  |
Purchase price from cash payment | $ 8 |  |
GSE Mortgages |  |  |
Subsequent Event [Line Items] |  |  |
Securities purchased under agreements |  |  | $ 24,000
Mortgages |  |  |
Subsequent Event [Line Items] |  |  |
Securities purchased under agreements |  |  | $ 24,000

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