RESIDENTIAL MORTGAGE LOANS - Schedule of Net Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest income:
Loans held-for-investment, at fair value	$ 9,509	$ 10,280
Total interest income	48,299	82,360
Interest expense:
Loans held-for-investment, at fair value	4,670	7,346
Total interest expense	48,356	50,303
Net interest income	(57)	32,057
Loans held-for-sale, at lower of cost or fair value
Interest income:
Loans held-for-sale	1,504	1,771
Interest expense:
Loans held-for-sale	907	849
Loans held-for-sale, at fair value
Interest income:
Loans held-for-sale	37,286	70,309
Interest expense:
Loans held-for-sale	$ 42,779	$ 42,108