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LOANS - Investment Loan Activity (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 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]
Purchases / originations 3,438,802
Sales and transfers (3,375,118)
Principal payments (82,602)
Gains / (losses) 8,093
(Amortization) / accretion (5,867)
Ending balance September 30, 2023 1,793,140 [2]
Transfer of residential loans to securitization vehicles, carrying value $ 3,400,000
[1] (1)Derived from the audited consolidated financial statements at December 31, 2022.
[2] (4)Includes $1.1 million and $1.3 million of residential mortgage loans held for sale at September 30, 2023 and December 31, 2022, respectively.