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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, 2021
Dec. 31, 2020
Sep. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 408,785 $ 293,183 $ 649,822
Investment securities available for sale, at fair value 140,597 311,284  
Other assets 136,692 115,292  
Total Assets [1] 4,912,809 4,655,587  
Other Liabilities 121,256 101,746  
Liabilities [1] 2,550,390 2,348,014  
Non-controlling interest in consolidated variable interest entities 4,626 6,371  
Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 710,102 569,323  
Residential Collateralized Debt Obligations, at Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 904,976 1,054,335  
VIE, Primary Beneficiary      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total Assets 2,217,348 2,150,984  
Liabilities 1,793,066 1,667,306  
VIE, Primary Beneficiary | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 710,102 569,323  
VIE, Primary Beneficiary | Residential Collateralized Debt Obligations, at Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 904,976 1,054,335  
VIE, Primary Beneficiary | Residential Loan Securitizations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 0  
Investment securities available for sale, at fair value   0  
Operating real estate, net held in Consolidated VIEs 0 0  
Other assets 33,141 24,959  
Total Assets 844,724 716,410  
Multi-family CDOs, at fair value 710,102 554,067  
Mortgages payable in consolidated variable interest entities 0 0  
Other Liabilities 6,326 2,610  
Liabilities 716,428 556,677  
Non-controlling interest in consolidated variable interest entities 0 0  
Net investment 128,296 159,733  
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 811,583 691,451  
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents   0  
Investment securities available for sale, at fair value   109,140  
Operating real estate, net held in Consolidated VIEs   0  
Other assets   535  
Total Assets   109,675  
Multi-family CDOs, at fair value   15,256  
Mortgages payable in consolidated variable interest entities   0  
Other Liabilities   70  
Liabilities   15,326  
Non-controlling interest in consolidated variable interest entities   0  
Net investment   94,349  
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value   0  
VIE, Primary Beneficiary | Consolidated SLST      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 0  
Investment securities available for sale, at fair value   0  
Operating real estate, net held in Consolidated VIEs 0 0  
Other assets 3,702 4,075  
Total Assets 1,140,707 1,270,860  
Multi-family CDOs, at fair value 904,976 1,054,335  
Mortgages payable in consolidated variable interest entities 0 0  
Other Liabilities 3,073 2,781  
Liabilities 908,049 1,057,116  
Non-controlling interest in consolidated variable interest entities 0 0  
Net investment 232,658 213,744  
VIE, Primary Beneficiary | Consolidated SLST | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 1,137,005 1,266,785  
VIE, Primary Beneficiary | Other      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 3,457 462  
Investment securities available for sale, at fair value   0  
Operating real estate, net held in Consolidated VIEs 209,736 50,532  
Other assets 18,724 3,045  
Total Assets 231,917 54,039  
Multi-family CDOs, at fair value 0 0  
Mortgages payable in consolidated variable interest entities 163,941 36,752  
Other Liabilities 4,648 1,435  
Liabilities 168,589 38,187  
Non-controlling interest in consolidated variable interest entities 4,626 6,371  
Net investment 58,702 9,481  
VIE, Primary Beneficiary | Other | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 0 0  
VIE, Primary Beneficiary | Financing And Other VIEs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 3,457 462  
Investment securities available for sale, at fair value   109,140  
Operating real estate, net held in Consolidated VIEs 209,736 50,532  
Other assets 55,567 32,614  
Total Assets 2,217,348 2,150,984  
Multi-family CDOs, at fair value 1,615,078 1,623,658  
Mortgages payable in consolidated variable interest entities 163,941 36,752  
Other Liabilities 14,047 6,896  
Liabilities 1,793,066 1,667,306  
Non-controlling interest in consolidated variable interest entities 4,626 6,371  
Net investment 419,656 477,307  
VIE, Primary Beneficiary | Financing And Other VIEs | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value $ 1,948,588 $ 1,958,236  
[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, 2021 and December 31, 2020, assets of consolidated VIEs totaled $2,217,348 and $2,150,984, respectively, and the liabilities of consolidated VIEs totaled $1,793,066 and $1,667,306, respectively. See Note 7 for further discussion.