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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Aug. 31, 2017
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Nov. 30, 2019
Jan. 31, 2019
Variable Interest Entity [Line Items]              
aggregate principal balance [1]   $ 4,242,043,000 $ 3,083,821,000        
Net gains (losses) on disposal of investments and other   (62,705,000) 661,513,000 $ (47,944,000)      
Securitized debt of consolidated VIEs   5,155,633,000 5,652,982,000        
Estimated fair value [2]   63,655,674,000 75,652,396,000        
Costs incurred in connection with securitization   186,014,000 222,195,000 $ 271,768,000      
Other secured financing   903,255,000 917,876,000        
Participations issued   1,049,066,000 39,198,000        
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   2,400,000,000          
Loans transferred for cash   316,900,000          
Consolidated VIEs | Residential Trusts              
Variable Interest Entity [Line Items]              
Contractual principal amount of debt held by third parties   0 23,000,000        
Other secured financing     0        
Consolidated VIEs | Borrower              
Variable Interest Entity [Line Items]              
Credit facility, maximum borrowing capacity   675,000,000 625,000,000        
Other secured financing   433,300,000 441,100,000        
Consolidated VIEs | Multifamily              
Variable Interest Entity [Line Items]              
Cut-off date principal balance         $ 500,000,000 $ 1,000,000,000  
Derecognized securities     1,200,000,000        
Derecognized securitization vehicles     1,100,000,000        
Net gains (losses) on disposal of investments and other     104,800,000        
Costs incurred     1,100,000        
Consolidated VIEs | Multifamily | Retained Interest              
Variable Interest Entity [Line Items]              
Retained interest notional balance         $ 500,000,000 1,000,000,000  
Consolidated VIEs | Multifamily | Senior Securities              
Variable Interest Entity [Line Items]              
aggregate principal balance           $ 28,500,000  
Consolidated VIEs | Consolidation, Eliminations | Borrower              
Variable Interest Entity [Line Items]              
aggregate principal balance   433,300,000 441,100,000        
Consolidated VIEs | Corporate Loans | Borrower              
Variable Interest Entity [Line Items]              
Transferred loans pledged as collateral for credit facility   692,600,000 786,900,000        
Consolidated VIEs | OBX Trust              
Variable Interest Entity [Line Items]              
Contractual principal amount of debt held by third parties   4,600,000,000 2,500,000,000        
Securitized debt of consolidated VIEs   4,600,000,000 2,600,000,000        
Costs incurred in connection with securitization   5,600,000 7,200,000        
Consolidated VIEs | OBX Trust | Consolidation, Eliminations              
Variable Interest Entity [Line Items]              
Estimated fair value   780,800,000 653,000,000        
Consolidated VIEs | July 2017 Credit Facility | Borrower              
Variable Interest Entity [Line Items]              
Credit facility, maximum borrowing capacity   400,000,000 320,000,000        
Consolidated VIEs | July 2017 Credit Facility | Corporate Loans | Borrower              
Variable Interest Entity [Line Items]              
Transferred loans pledged as collateral for credit facility   402,900,000 400,400,000        
Other secured financing   238,200,000 209,700,000        
Consolidated VIEs | January 2019 Credit Facility | Borrower              
Variable Interest Entity [Line Items]              
Credit facility, maximum borrowing capacity     300,000,000       $ 400,000,000
Consolidated VIEs | January 2019 Credit Facility | Corporate Loans | Borrower              
Variable Interest Entity [Line Items]              
Transferred loans pledged as collateral for credit facility   368,000,000 409,200,000        
Other secured financing   231,800,000 236,600,000        
VIE, Not Primary Beneficiary | Residential mortgage loans              
Variable Interest Entity [Line Items]              
Participations issued   $ 1,000,000,000 $ 39,200,000        
[1] (3) Includes $2.3 million and $47.0 million of residential mortgage loans held for sale at December 31, 2021 and 2020, respectively.
[2] (2) Excludes $44.2 million and $81.5 million at December 31, 2021 and 2020, respectively, of agency mortgage-backed securities, $350.4 million and $576.6 million at December 31, 2021 and 2020, respectively, of non-Agency mortgage-backed securities and $0.0 million and $391.0 million at December 31, 2021 and 2020, respectively, of commercial mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.