GOODWILL AND INTANGIBLE ASSETS - Carrying Value of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2021	$ 85,199
Goodwill acquired	0
Accumulated impairment loss	0
Other adjustments	0
Balance at March 31, 2022	85,199
Origination
Goodwill [Roll Forward]
Balance at December 31, 2021	11,836
Goodwill acquired	0
Accumulated impairment loss	0
Other adjustments	0
Balance at March 31, 2022	11,836
Servicing
Goodwill [Roll Forward]
Balance at December 31, 2021	12,540
Goodwill acquired	0
Accumulated impairment loss	0
Other adjustments	0
Balance at March 31, 2022	12,540
MSR Related Investments
Goodwill [Roll Forward]
Balance at December 31, 2021	5,092
Goodwill acquired	0
Accumulated impairment loss	0
Other adjustments	0
Balance at March 31, 2022	5,092
Mortgage Loans Receivable
Goodwill [Roll Forward]
Balance at December 31, 2021	55,731
Goodwill acquired	0
Accumulated impairment loss	0
Other adjustments	0
Balance at March 31, 2022	$ 55,731