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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, 2017 USD ($) loan	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Mortgage Loans on Real Estate [Line Items]
Amount		$ 179,352,553	$ 209,185,063	$ 251,071,380
Residential Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Amount	[1]	$ 179,352,553	$ 209,092,130	$ 250,966,112
Count | loan		1,221,695
California [Member] | Residential Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Amount		$ 40,548,633
Count | loan		164,652
New York [Member] | Residential Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Amount		$ 17,132,957
Count | loan		72,500
Florida [Member] | Residential Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Amount		$ 15,133,283
Count | loan		114,070
New Jersey [Member] | Residential Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Amount		$ 8,843,459
Count | loan		43,819
Texas [Member] | Residential Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Amount		$ 8,130,540
Count | loan		95,999
Other [Member] | Residential Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Amount		$ 89,563,681
Count | loan		730,655
[1] Includes foreclosed real estate and small-balance commercial assets.

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- Definition

Total of property assets serviced as measured by UPB.

+ References

No definition available.

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- Definition

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- Definition

Indicates the number of mortgages under each classification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.3)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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