DERIVATIVES - Derivatives Gain (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Change in fair value of derivative instruments	$ 21,106	$ (40,666)	$ (18,876)	$ (66,426)
Gain (loss) on settlement of investments, net	(25,195)	(45,201)	(109,907)	(138,277)
Gain on originated mortgage loans, held-for-sale, net	154,741	3,937	106,666	5,930
Total income (losses)	150,652	(81,930)	(22,117)	(198,773)
Loss on settlement of mortgage loan origination derivative instruments	175,568	18,318	221,881	29,741
Interest Rate Caps
Derivative [Line Items]
Change in fair value of derivative instruments	0	0	0	(3)
Interest Rate Swaps
Derivative [Line Items]
Change in fair value of derivative instruments	21,106	(40,666)	(18,876)	(69,199)
Gain (loss) on settlement of investments, net	(25,195)	(5,813)	(38,847)	(22,191)
Interest Rate Lock Commitments
Derivative [Line Items]
Gain on originated mortgage loans, held-for-sale, net	32,806	7,701	124,054	10,909
Forward Loan Sale Commitments
Derivative [Line Items]
Gain on originated mortgage loans, held-for-sale, net	0	223	27	202
TBAs
Derivative [Line Items]
Change in fair value of derivative instruments	0	0	0	2,776
Gain (loss) on settlement of investments, net	0	(39,388)	(71,060)	(116,086)
Gain on originated mortgage loans, held-for-sale, net	$ 121,935	$ (3,987)	$ (17,415)	$ (5,181)

Gain (Loss) on Settlement Of Mortgage Loan Origination Derivative Instruments

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- Definition

Unrealized Gain (Loss) On Originated Mortgage Loans Held-For-Sale, Derivatives Instruments, Net

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

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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.

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No definition available.

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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