DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Realized and Unrealized Gains on Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized gains (losses) on derivative financial instruments	$ 299,860	$ (176,025)	$ 607,352	$ 95,476
Gain on origination and sale of loans, net | Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized gains (losses) on derivative financial instruments	45,605	86,303	(123,015)	(313,964)
Gain on origination and sale of loans, net | Forward sale contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized gains (losses) on derivative financial instruments	297,939	(317,263)	962,458	507,082
Gain on origination and sale of loans, net | Interest rate swap futures
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized gains (losses) on derivative financial instruments	(50,848)	(22,217)	(84,530)	(52,208)
Gain on origination and sale of loans, net | Put options
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized gains (losses) on derivative financial instruments	70,593	(6,699)	116,159	27,171
Change in fair value of servicing rights, net | Forward sale contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized gains (losses) on derivative financial instruments	(23,399)	33,925	(97,627)	(79,004)
Change in fair value of servicing rights, net | Interest rate swap futures
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized gains (losses) on derivative financial instruments	(38,916)	48,194	(165,579)	7,178
Change in fair value of servicing rights, net | Put options
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized gains (losses) on derivative financial instruments	$ (1,114)	$ 1,732	$ (514)	$ (779)