DERIVATIVES AND HEDGING - Derivatives and Hedging Gain (Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Total gain (loss)	$ (103,358)	$ 1,380,323	$ (79,394)
Gain (loss) on settlement of residential mortgage loan	$ 73,476	$ 1,285,219	$ 240,610
Servicing Revenue
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenue	Revenue	Revenue
Total gain (loss)	$ 0	$ (11,316)	$ (30,481)
Gain (loss) on settlement of derivative instruments	$ 0	$ (79,000)	$ (34,700)
Gain on originated residential mortgage loans, held-for-sale, net
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenue	Revenue	Revenue
Total gain (loss)	$ (49,016)	$ (77,292)	$ (175,135)
Change In Fair Value Of Investments
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized and unrealized gains (losses), net	Realized and unrealized gains (losses), net	Realized and unrealized gains (losses), net
Total gain (loss)	$ (54,342)	$ 1,468,931	$ 126,222
Interest rate lock commitments
Derivative [Line Items]
Total gain (loss)	15,018	(102,992)	(293,699)
TBAs | Servicing Revenue
Derivative [Line Items]
Total gain (loss)	0	(15,205)	10,483
TBAs | Gain on originated residential mortgage loans, held-for-sale, net
Derivative [Line Items]
Total gain (loss)	(62,924)	25,700	118,564
TBAs | Change In Fair Value Of Investments
Derivative [Line Items]
Total gain (loss)	(7,326)	309,154	(36,508)
Treasury futures
Derivative [Line Items]
Total gain (loss)	0	(1,746)	(23,961)
Options on treasury futures
Derivative [Line Items]
Total gain (loss)	0	5,635	(17,003)
Interest rate swaps | Gain on originated residential mortgage loans, held-for-sale, net
Derivative [Line Items]
Total gain (loss)	(1,110)	0	0
Interest rate swaps | Change In Fair Value Of Investments
Derivative [Line Items]
Total gain (loss)	20,990	1,159,777	162,730
Treasury short sales
Derivative [Line Items]
Total gain (loss)	$ (68,006)	$ 0	$ 0