RESIDENTIAL MORTGAGE LOANS - Gain On Sale of Originated Mortgage Loans, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Long Lived Assets Held-for-sale [Line Items]
Gain on loans originated and sold, net	$ (370,421)	$ 1,087
Gain (loss) on settlement of mortgage loan origination derivative instruments	524,823	40,121
MSRs retained on transfer of loans	461,452	255,473
Other	27,701	23,697
Realized gain on sale of originated residential mortgage loans, net	643,555	320,378
Change in fair value of derivative instruments	118,438	173,033
Gain on originated residential mortgage loans, held-for-sale, net	471,996	403,448
Loan origination fees and direct loan origination costs	252,500	658,300
Change in fair value of interest rate lock commitments
Long Lived Assets Held-for-sale [Line Items]
Change in fair value of derivative instruments	(127,685)	(234,982)
Change in fair value of derivative instruments
Long Lived Assets Held-for-sale [Line Items]
Change in fair value of derivative instruments	246,123	408,015
Change in fair value of residential mortgage loans
Long Lived Assets Held-for-sale [Line Items]
Change in fair value of residential mortgage loans	$ (289,997)	$ (89,963)