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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Variable Interest Entity [Line Items]      
Securitized debt of consolidated VIEs $ 13,690,967   $ 11,600,338 [1]
Costs incurred in connection with securitization 38,570 $ 40,828  
Securitized debt of consolidated VIE, unrealized gain (loss) 86,000 (211,900)  
Participations issued 1,161,323   1,103,835 [1]
Consolidated VIEs      
Variable Interest Entity [Line Items]      
Exposure to obligations of VIEs 1,600,000    
Securitized debt of consolidated VIEs 13,700,000   11,600,000
Costs incurred in connection with securitization 3,700 $ 1,400  
Contractual principal amount of debt held by third parties 14,800,000   12,600,000
Consolidated VIEs | Consolidation, Eliminations      
Variable Interest Entity [Line Items]      
Mortgage-backed securities 1,600,000   1,400,000
VIE, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Participations issued $ 1,200,000   $ 1,100,000
[1]
(1)Derived from the audited consolidated financial statements at December 31, 2023.