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Mortgage Servicing - Summary of Geographic Distributions of UPB and Count of Residential Loans and Real Estate Serviced (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Amount | $ 256,000,490 | $ 179,352,553 | $ 209,092,130
Residential Mortgage [Member] |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Amount | $ 256,000,490 |  |
Count | loan | 1,562,238 |  |
California [Member] | Residential Mortgage [Member] |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Amount | $ 56,455,157 |  |
Count | loan | 201,058 |  |
New York [Member] | Residential Mortgage [Member] |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Amount | $ 25,411,051 |  |
Count | loan | 101,444 |  |
Florida [Member] | Residential Mortgage [Member] |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Amount | $ 20,345,407 |  |
Count | loan | 134,335 |  |
New Jersey [Member] | Residential Mortgage [Member] |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Amount | $ 13,711,894 |  |
Count | loan | 65,263 |  |
Texas [Member] | Residential Mortgage [Member] |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Amount | $ 11,858,287 |  |
Count | loan | 111,512 |  |
Other [Member] | Residential Mortgage [Member] |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Amount | $ 128,218,694 |  |
Count | loan | 948,626 |  |

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- Definition Total of property assets serviced as measured by UPB. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 3 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 3)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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