INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLE - Schedule of Investment in MSRs (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Servicing Asset at Amortized Cost [Line Items]
Weighted Average Life (Years)	1 year 3 months 1 day
Carrying Value	$ 1,702,749	$ 659,483
Carrying Value	607,396	0
Mortgage Servicing Rights
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Mortgages	$ 177,285,425
Weighted Average Life (Years)	6 years 4 months 28 days
Amortized Cost Basis	$ 1,521,605
Carrying Value	$ 1,702,749
Discount rate	9.80%
Mortgage Servicing Rights Financing Receivable
Servicing Asset at Amortized Cost [Line Items]
Discount rate	10.40%
Agency \| Mortgage Servicing Rights
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Mortgages	$ 177,220,692
Weighted Average Life (Years)	6 years 4 months 28 days
Amortized Cost Basis	$ 1,521,605
Carrying Value	1,702,749
Non-Agency \| Mortgage Servicing Rights
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Mortgages	$ 64,733
Weighted Average Life (Years)	5 years 9 months 24 days
Amortized Cost Basis	$ 0
Carrying Value	0
Mortgage Servicing Rights
Servicing Asset at Amortized Cost [Line Items]
Carrying Value	1,702,749	$ 659,483
Mortgage Servicing Rights \| Mortgage Servicing Rights Financing Receivable
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Mortgages	$ 67,052,949
Weighted Average Life (Years)	5 years 7 months 19 days
Amortized Cost Basis	$ 511,558
Carrying Value	607,396
Mortgage Servicing Rights \| Agency \| Mortgage Servicing Rights Financing Receivable
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Mortgages	$ 51,533,451
Weighted Average Life (Years)	5 years 6 months 30 days
Amortized Cost Basis	$ 447,925
Carrying Value	473,669
Mortgage Servicing Rights \| Non-Agency \| Mortgage Servicing Rights Financing Receivable
Servicing Asset at Amortized Cost [Line Items]
UPB of Underlying Mortgages	$ 15,519,498
Weighted Average Life (Years)	5 years 9 months 24 days
Amortized Cost Basis	$ 63,633
Carrying Value	$ 133,727

Mortgage Servicing Rights, Financing Receivable, at Fair Value

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- Definition

The unpaid principal balance of underlying loans.

+ References

No definition available.

+ Details

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- Definition

Weighted average expected timing of the receipt of expected cash flows for this investment.

+ References

No definition available.

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- Definition

Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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- Definition

Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746

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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.

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