DERIVATIVES - Gain (Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Total gain (loss)	$ 1,380,323	$ (79,394)	$ 5,688
Settlement of derivatives	374,464	(172,581)	(74,812)
Gain (loss) on settlement of residential mortgage loan origination derivative instruments	1,285,219	240,610	(361,755)
Servicing Revenue
Derivative [Line Items]
Total gain (loss)	(11,316)	(30,481)	$ 0
Settlement of derivatives	$ (79,000)	$ (34,700)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset, Net Of Change In Fair Value	Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset, Net Of Change In Fair Value	Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset, Net Of Change In Fair Value
Gain On Originated Residential Mortgage Loans, Held For Sale, Net
Derivative [Line Items]
Total gain (loss)	$ (77,292)	$ (175,135)	$ 133,967
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on originated residential mortgage loans, held-for-sale, net	Gain on originated residential mortgage loans, held-for-sale, net	Gain on originated residential mortgage loans, held-for-sale, net
Change In Fair Value Of Investments
Derivative [Line Items]
Total gain (loss)	$ 1,094,467	$ 298,803	$ (53,467)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Change in fair value of investments	Change in fair value of investments	Change in fair value of investments
Gain (Loss) On Settlement Of Investments, Net
Derivative [Line Items]
Total gain (loss)	$ 374,464	$ (172,581)	$ (74,812)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (loss) on settlement of investments, net	Gain (loss) on settlement of investments, net	Gain (loss) on settlement of investments, net
TBAs | Servicing Revenue
Derivative [Line Items]
Total gain (loss)	$ (15,205)	$ 10,483	$ 0
TBAs | Gain On Originated Residential Mortgage Loans, Held For Sale, Net
Derivative [Line Items]
Total gain (loss)	25,700	118,564	(115,243)
TBAs | Change In Fair Value Of Investments
Derivative [Line Items]
Total gain (loss)	29,506	0	0
TBAs | Gain (Loss) On Settlement Of Investments, Net
Derivative [Line Items]
Total gain (loss)	279,648	(36,508)	(72,127)
Treasury futures
Derivative [Line Items]
Total gain (loss)	(1,746)	(23,961)	0
Options on treasury futures
Derivative [Line Items]
Total gain (loss)	5,635	(17,003)	0
Interest rate lock commitments
Derivative [Line Items]
Total gain (loss)	(102,992)	(293,699)	249,183
Forward Loan Sale Commitments
Derivative [Line Items]
Total gain (loss)	0	0	27
Interest rate swaps | Change In Fair Value Of Investments
Derivative [Line Items]
Total gain (loss)	1,064,961	298,803	(53,467)
Interest rate swaps | Gain (Loss) On Settlement Of Investments, Net
Derivative [Line Items]
Total gain (loss)	$ 94,816	$ (136,073)	$ (2,685)