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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Mar. 31, 2020
Variable Interest Entity [Line Items]            
Securitized debt of consolidated VIEs $ 9,983,847   $ 9,983,847   $ 7,744,160 [1]  
Costs incurred in connection with securitization 39,909 $ 37,922 123,652 $ 119,724    
Securitized debt of consolidated VIE, unrealized gain (loss) 294,900 343,500 213,500 1,000,000    
Participations issued 788,442   788,442   800,849 [1]  
Consolidated VIEs            
Variable Interest Entity [Line Items]            
Exposure to obligations of VIEs 1,200,000   1,200,000      
Consolidated VIEs | OBX Trust            
Variable Interest Entity [Line Items]            
Securitized debt of consolidated VIEs 10,000,000   10,000,000   7,700,000  
Costs incurred in connection with securitization 1,900 $ 1,700 5,900 $ 6,800    
Contractual principal amount of debt held by third parties 11,500,000   11,500,000   9,000,000  
Consolidated VIEs | Consolidation, Eliminations | OBX Trust            
Variable Interest Entity [Line Items]            
Mortgage-backed securities 1,200,000   1,200,000   1,000,000  
VIE, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Participations issued $ 788,400   $ 788,400   $ 800,800  
Multifamily | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Cut-off date principal balance           $ 500,000
Multifamily | Retained Interest | Consolidated VIEs            
Variable Interest Entity [Line Items]            
Retained interest notional balance           $ 500,000
[1] (1)Derived from the audited consolidated financial statements at December 31, 2022.