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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
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 324,927 $ 293,183 $ 371,697
Investment securities available for sale, at fair value 225,267 311,284  
Other assets 314,434 165,824  
Total Assets [1] 4,780,927 4,655,587  
Other Liabilities 204,247 138,498  
Total Liabilities [1] 2,454,568 2,348,014  
Non-controlling interest in consolidated variable interest entities 5,198 6,371  
Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 683,724 569,323  
Residential Collateralized Debt Obligations, at Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 948,090 1,054,335  
VIE, Primary Beneficiary      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total Assets 2,212,001 2,150,984  
Total Liabilities 1,744,689 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 683,724 569,323  
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 948,090 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 94,036 24,959  
Total Assets 893,399 716,410  
Multi-family CDOs, at fair value 683,724 554,067  
Mortgages payable in consolidated variable interest entities 0 0  
Other Liabilities 9,618 2,610  
Total Liabilities 693,342 556,677  
Non-controlling interest in consolidated variable interest entities 0 0  
Net investment 200,057 159,733  
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 799,363 691,451  
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  
Total 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 3,849 4,075  
Total Assets 1,180,388 1,270,860  
Multi-family CDOs, at fair value 948,090 1,054,335  
Mortgages payable in consolidated variable interest entities 0 0  
Other Liabilities 2,467 2,781  
Total Liabilities 950,557 1,057,116  
Non-controlling interest in consolidated variable interest entities 0 0  
Net investment 229,831 213,744  
VIE, Primary Beneficiary | Consolidated SLST | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 1,176,539 1,266,785  
VIE, Primary Beneficiary | Other      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 2,799 462  
Investment securities available for sale, at fair value   0  
Operating real estate, net held in Consolidated VIEs 125,253 50,532  
Other assets 10,162 3,045  
Total Assets 138,214 54,039  
Multi-family CDOs, at fair value 0 0  
Mortgages payable in consolidated variable interest entities 98,611 36,752  
Other Liabilities 2,179 1,435  
Total Liabilities 100,790 38,187  
Non-controlling interest in consolidated variable interest entities 5,198 6,371  
Net investment 32,226 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 2,799 462  
Investment securities available for sale, at fair value   109,140  
Operating real estate, net held in Consolidated VIEs 125,253 50,532  
Other assets 108,047 32,614  
Total Assets 2,212,001 2,150,984  
Multi-family CDOs, at fair value 1,631,814 1,623,658  
Mortgages payable in consolidated variable interest entities 98,611 36,752  
Other Liabilities 14,264 6,896  
Total Liabilities 1,744,689 1,667,306  
Non-controlling interest in consolidated variable interest entities 5,198 6,371  
Net investment 462,114 477,307  
VIE, Primary Beneficiary | Financing And Other VIEs | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value $ 1,975,902 $ 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 June 30, 2021 and December 31, 2020, assets of consolidated VIEs totaled $2,212,001 and $2,150,984, respectively, and the liabilities of consolidated VIEs totaled $1,744,689 and $1,667,306, respectively. See Note 7 for further discussion.