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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Assets and Liabilities of Consolidated VIEs (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 649,822 $ 118,763 $ 65,906
Investment securities available for sale 323,399 1,760,812  
Receivables and other assets 142,945 169,214  
Total Assets [1] 4,621,113 23,483,369  
Accrued expenses and other liabilities 79,900 177,260  
Total Liabilities [1] 2,367,730 21,278,340  
Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 268,820 40,429  
Residential collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 1,077,980 1,052,829  
Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 0 16,724,451  
Other      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total Liabilities   75  
Financing And Other VIEs | Residential loans, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value   1,328,886  
VIE, Primary Beneficiary      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total Assets 1,852,657 19,270,384  
Total Liabilities 1,440,936 17,878,314  
VIE, Primary Beneficiary | Residential Loan Securitizations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 0  
Receivables and other assets 12,568 1,328  
Total Assets 368,054 45,358  
Accrued expenses and other liabilities 1,211 14  
Total Liabilities 270,031 40,443  
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 268,820 40,429  
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential loans, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 355,486    
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential loans, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans held in securitization trusts, net   44,030  
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities available for sale 131,836    
Receivables and other assets 50,635    
Total Assets 182,471    
Collateralized debt obligations 88,791    
Accrued expenses and other liabilities 396    
Total Liabilities 89,187    
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 0    
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization | Residential loans, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 0    
VIE, Primary Beneficiary | Consolidated K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents   0  
Receivables and other assets   59,417  
Total Assets   17,876,163  
Accrued expenses and other liabilities   57,873  
Total Liabilities   16,782,324  
VIE, Primary Beneficiary | Consolidated K-Series | Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations   16,724,451  
VIE, Primary Beneficiary | Consolidated K-Series | Multi-family loans held in securitization trusts, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family loans held in securitization trusts, at fair value   17,816,746  
VIE, Primary Beneficiary | Consolidated SLST      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0    
Receivables and other assets 4,162 5,244  
Total Assets 1,294,167 1,334,130  
Accrued expenses and other liabilities 3,664 2,643  
Total Liabilities 1,081,644 1,055,472  
VIE, Primary Beneficiary | Consolidated SLST | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 0    
VIE, Primary Beneficiary | Consolidated SLST | Residential collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 1,077,980 1,052,829  
VIE, Primary Beneficiary | Consolidated SLST | Residential loans, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 1,290,005 1,328,886  
VIE, Primary Beneficiary | Other      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 4,305 107  
Receivables and other assets 3,660 14,626  
Total Assets 7,965 14,733  
Accrued expenses and other liabilities 74 75  
Total Liabilities 74    
VIE, Primary Beneficiary | Other | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 0    
VIE, Primary Beneficiary | Financing And Other VIEs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 4,305 107  
Investment securities available for sale 131,836    
Receivables and other assets 71,025 80,615  
Total Assets 1,852,657 19,270,384  
Collateralized debt obligations 88,791    
Accrued expenses and other liabilities 5,345 60,605  
Total Liabilities 1,440,936 17,878,314  
VIE, Primary Beneficiary | Financing And Other VIEs | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 268,820 40,429  
VIE, Primary Beneficiary | Financing And Other VIEs | Residential collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 1,077,980 1,052,829  
VIE, Primary Beneficiary | Financing And Other VIEs | Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations   16,724,451  
VIE, Primary Beneficiary | Financing And Other VIEs | Residential loans, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value $ 1,645,491    
VIE, Primary Beneficiary | Financing And Other VIEs | Residential loans, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans held in securitization trusts, net   44,030  
VIE, Primary Beneficiary | Financing And Other VIEs | Multi-family loans held in securitization trusts, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family loans held in securitization trusts, at fair value   $ 17,816,746  
[1] Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of September 30, 2020 and December 31, 2019, assets of consolidated VIEs totaled $1,852,657 and $19,270,384, respectively, and the liabilities of consolidated VIEs totaled $1,440,936 and $17,878,314, respectively. See Note 9 for further discussion.