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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2017
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Mar. 31, 2020
Nov. 30, 2019
Variable Interest Entity [Line Items]                
Principal receivable [1]   $ 3,563,008,000   $ 3,563,008,000   $ 3,083,821,000 [2]    
Securitized debt of consolidated VIEs   3,315,087,000   3,315,087,000   5,652,982,000 [2]    
Mortgage-backed securities [3]   69,032,335,000   69,032,335,000   75,652,396,000 [2]    
Costs incurred in connection with securitization   53,526,000 $ 64,770,000 101,431,000 $ 134,635,000      
Other secured financing   909,655,000   909,655,000   917,876,000 [2]    
Participations issued   315,810,000   315,810,000   39,198,000 [2]    
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   2,300,000,000   2,300,000,000        
Consolidated VIEs | Residential mortgage loans                
Variable Interest Entity [Line Items]                
Securitized debt of consolidated VIEs   14,500,000   14,500,000        
Consolidated VIEs | OBX Trust                
Variable Interest Entity [Line Items]                
Contractual principal amount of debt held by third parties   2,700,000,000   2,700,000,000        
Securitized debt of consolidated VIEs   2,700,000,000   2,700,000,000        
Costs incurred in connection with securitization   1,200,000 $ 0.0 1,800,000 3,700,000      
Consolidated VIEs | Consolidation, Eliminations | Residential mortgage loans                
Variable Interest Entity [Line Items]                
Mortgage-backed securities   12,600,000   12,600,000        
Consolidated VIEs | Consolidation, Eliminations | OBX Trust                
Variable Interest Entity [Line Items]                
Mortgage-backed securities   642,300,000   642,300,000        
Consolidated VIEs | Residential Trusts                
Variable Interest Entity [Line Items]                
Contractual principal amount of debt held by third parties   14,400,000   14,400,000   23,000,000.0    
Other secured financing           0    
Consolidated VIEs | Borrower | June 2016 Credit Facility                
Variable Interest Entity [Line Items]                
Credit facility, maximum borrowing capacity   675,000,000.0   675,000,000.0        
Other secured financing   441,400,000   441,400,000        
Consolidated VIEs | Borrower | June 2016 Credit Facility | Corporate Loans                
Variable Interest Entity [Line Items]                
Transferred loans pledged as collateral for credit facility   670,400,000   670,400,000        
Consolidated VIEs | Borrower | July 2017 Credit Facility                
Variable Interest Entity [Line Items]                
Credit facility, maximum borrowing capacity   400,000,000.0   400,000,000.0        
Consolidated VIEs | Borrower | July 2017 Credit Facility | Corporate Loans                
Variable Interest Entity [Line Items]                
Transferred loans pledged as collateral for credit facility   366,400,000   366,400,000        
Other secured financing   239,200,000   239,200,000        
Consolidated VIEs | Borrower | January 2019 Credit Facility                
Variable Interest Entity [Line Items]                
Credit facility, maximum borrowing capacity   400,000,000.0   400,000,000.0        
Consolidated VIEs | Borrower | January 2019 Credit Facility | Corporate Loans                
Variable Interest Entity [Line Items]                
Transferred loans pledged as collateral for credit facility   341,200,000   341,200,000        
Other secured financing   229,100,000   229,100,000        
Consolidated VIEs | Borrower | Consolidation, Eliminations | June 2016 Credit Facility                
Variable Interest Entity [Line Items]                
Principal receivable   441,400,000   441,400,000        
VIE, Not Primary Beneficiary                
Variable Interest Entity [Line Items]                
Loans transferred for cash   59,900,000   75,000,000.0        
VIE, Not Primary Beneficiary | Residential mortgage loans                
Variable Interest Entity [Line Items]                
Participations issued   $ 315,800,000   $ 315,800,000   $ 39,200,000    
Multifamily | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Cut-off date principal balance             $ 500,000,000 $ 1,000,000,000.0
Costs incurred         $ 1,100,000      
Multifamily | Retained Interest | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Retained interest notional balance             $ 500,000,000 1,000,000,000.0
Multifamily | Senior Loans | Consolidated VIEs                
Variable Interest Entity [Line Items]                
Principal receivable               $ 28,500,000
[1] Includes $3.7 million and $47.0 million of residential mortgage loans held for sale at June 30, 2021 and December 31, 2020, respectively, and $466.4 million and $0 of corporate loans held for sale at June 30, 2021 and December 31, 2020, respectively.
[2] Derived from the audited consolidated financial statements at December 31, 2020.
[3] Excludes $48.4 million and $81.5 million at June 30, 2021 and December 31, 2020, respectively, of Agency mortgage-backed securities, $191.8 million and $576.6 million at June 30, 2021 and December 31, 2020, respectively, of non-Agency mortgage-backed securities and $0 and $391.0 million at June 30, 2021 and December 31, 2020, respectively, of commercial mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.