DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Realized and Unrealized Gains on Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized losses on derivative financial instruments	$ (44,064)	$ (115,008)	$ (21,981)
Gain on origination and sale of loans, net | Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized losses on derivative financial instruments	(466,425)	518,837	67,742
Gain on origination and sale of loans, net | Forward sale contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized losses on derivative financial instruments	540,811	(748,245)	(130,328)
Gain on origination and sale of loans, net | Interest rate swap futures
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized losses on derivative financial instruments	(111,300)	(13,151)	(1,401)
Gain on origination and sale of loans, net | Put options
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized losses on derivative financial instruments	75,728	(27,112)	(586)
Change in fair value of servicing rights, net | Forward sale contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized losses on derivative financial instruments	(89,127)	140,173	21,618
Change in fair value of servicing rights, net | Interest rate swap futures
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized losses on derivative financial instruments	9,071	16,708	20,974
Change in fair value of servicing rights, net | Put options
Derivative Instruments, Gain (Loss) [Line Items]
Total realized and unrealized losses on derivative financial instruments	$ (2,822)	$ (2,218)	$ 0