LOANS - Investment Loan Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance January 1, 2023	$ 1,809,832	[1],[2]
Ending balance March 31, 2023	1,642,822	[2]
Transfer of residential loans to securitization vehicles, carrying value, noncash	1,100,000
Residential
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance January 1, 2023	1,809,832
Purchases / originations	927,497
Sales and transfers	(1,091,342)
Principal payments	(23,526)
Gains / (losses)	21,820
(Amortization) / accretion	(1,459)
Ending balance March 31, 2023	$ 1,642,822

[1] (1)Derived from the audited consolidated financial statements at December 31, 2022.

[2] (4)Includes $1.2 million and $1.3 million of residential mortgage loans held for sale at March 31, 2023 and December 31, 2022, respectively.