DERIVATIVES - Derivatives Gain (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative [Line Items]
Change in fair value of derivative instruments	$ (18,505)	$ (41,365)	$ (11,316)	$ (41,564)
Gain on originated mortgage loans, held-for-sale, net	129,233	50,771	96,017	(29,363)
Change in fair value of derivative instruments	451,896	45,389	1,210,516	214,367
Gain (loss) on settlement of investments, net	12,722	(73,978)	292,667	(152,913)
Total gain (loss)	575,346	(19,183)	1,587,884	(9,473)
Settlement of derivatives	(12,722)	73,978	(292,667)	152,913
Gain (loss) on settlement of mortgage loan origination derivative instruments	57,407	(105,594)	1,109,163	48,522
Servicing Revenue
Derivative [Line Items]
Settlement of derivatives	2,200	13,400	79,000	11,100
TBAs
Derivative [Line Items]
Change in fair value of derivative instruments	(18,505)	(14,156)	(15,205)	(14,355)
Gain on originated mortgage loans, held-for-sale, net	233,673	152,182	250,661	251,731
Change in fair value of derivative instruments	20,882	0	63,280	0
Gain (loss) on settlement of investments, net	(21,533)	(37,664)	294,707	(47,527)
Treasury futures
Derivative [Line Items]
Change in fair value of derivative instruments	0	(19,093)	(1,746)	(19,093)
Options on treasury futures
Derivative [Line Items]
Change in fair value of derivative instruments	0	(8,116)	5,635	(8,116)
Interest rate lock commitments
Derivative [Line Items]
Gain on originated mortgage loans, held-for-sale, net	(104,440)	(101,411)	(154,644)	(281,094)
Interest rate swaps
Derivative [Line Items]
Change in fair value of derivative instruments	431,014	45,389	1,147,236	214,367
Gain (loss) on settlement of investments, net	$ 34,255	$ (36,314)	$ (2,040)	$ (105,386)