INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Summary of Activities Related to the Carrying Value of Mortgage Loans (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Movement in Mortgage Loans on Real Estate [Roll Forward]
Accretion of loan discount and premium amortization, net	$ 545,386	$ 331,915
Transfer of loans to real estate owned	(61,319)
PCD Loans [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	190,761
Purchases/additional fundings	58,884
Sales	0
Proceeds from repayments	(15,277)
Accretion of loan discount and premium amortization, net	10,085
Transfer of loans to real estate owned	(14,130)
Transfer of loans to held-for-sale	0
Balance, ending	230,323
Residential Portfolio Segment [Member] \| Performing Loans [Member]
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	0
Purchases/additional fundings	527,098
Proceeds from repayments	0
Accretion of loan discount and premium amortization, net	0
Provision for loan losses	0
Transfer of loans to other assets	0
Transfer of loans to real estate owned	0
Balance, ending	$ 527,098

Mortgage Loans on Real Estate, Sales

No definition available.

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- Definition

Mortgage Loans on Real Estate, Transfer of Loans to Other Assets

+ References

No definition available.

+ Details

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- Definition

Mortgage Loans on Real Estate, Transfer to Loans Held-for-Sale

+ References

No definition available.

+ Details

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- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ References

Reference 1: 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

Reference 2: 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)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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- Definition

The amount of principal collected on mortgage loans on real estate during the reporting period.

+ 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 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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- Definition

Total amount of new mortgage loans on real estate during the reporting period.

+ References

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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- Details

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