DERIVATIVES - Derivatives Gain (Losses) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Derivative [Line Items]
Servicing revenue, net	$ 0	$ 7,189,000
Gain on originated residential mortgage loans, held-for-sale, net	(32,990,000)	118,438,000
Change in fair value of derivative instruments	(375,329,000)	574,697,000
Gain (loss) on settlement of investments, net	224,323,000	47,475,000
Total gain (loss)	(183,996,000)	747,799,000
Gain (loss) on settlement of mortgage loan origination derivative instruments	9,904,000	524,823,000
Servicing Revenue
Derivative [Line Items]
Gain (loss) on settlement of derivative instruments	0	76,800,000
TBAs
Derivative [Line Items]
Servicing revenue, net	0	3,300,000
Gain on originated residential mortgage loans, held-for-sale, net	(57,983,000)	246,123,000
Change in fair value of derivative instruments	(6,048,000)	110,363,000
Gain (loss) on settlement of investments, net	(1,333,000)	73,154,000
Treasury futures
Derivative [Line Items]
Servicing revenue, net	0	(1,746,000)
Options on treasury futures
Derivative [Line Items]
Servicing revenue, net	0	5,635,000
Interest rate lock commitments
Derivative [Line Items]
Gain on originated residential mortgage loans, held-for-sale, net	26,240,000	(127,685,000)
Interest rate swaps
Derivative [Line Items]
Gain on originated residential mortgage loans, held-for-sale, net	(1,247,000)	0
Change in fair value of derivative instruments	(369,281,000)	464,334,000
Gain (loss) on settlement of investments, net	$ 225,656,000	$ (25,679,000)