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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2017
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Mar. 31, 2020
Variable Interest Entity [Line Items]              
Securitized debt of consolidated VIEs   $ 9,789,282   $ 9,789,282   $ 7,744,160 [1]  
Mortgage-backed securities [2]   71,202,461   71,202,461   65,789,907 [1]  
Costs incurred in connection with securitization   42,915 $ 36,038 83,743 $ 81,802    
Securitized debt of consolidated VIE, unrealized gain (loss)   130,500 395,900 (81,400) 694,000    
Participations issued   492,307   492,307   800,849 [1]  
MSR Silo              
Variable Interest Entity [Line Items]              
Variable interest entity, ownership percentage 100.00%            
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   9,800,000   9,800,000   7,700,000  
Costs incurred in connection with securitization   2,700 $ 1,800 4,000 $ 5,100    
Contractual principal amount of debt held by third parties   11,000,000   11,000,000   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 | Residential mortgage loans              
Variable Interest Entity [Line Items]              
Participations issued   $ 492,300   $ 492,300   $ 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.
[2] (3)Excludes $1.3 billion and $1.0 billion at June 30, 2023 and December 31, 2022, respectively, of non-Agency mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.