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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
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 303,762 $ 289,602 $ 290,977
Other assets 268,442 215,019  
Total Assets [1] 6,541,752 5,658,301  
Other liabilities 187,981 161,081  
Total liabilities [1] 4,238,390 3,226,519  
Non-controlling interest in consolidated variable interest entities 32,383 24,359  
Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 1,143,855 682,802  
Consolidated SLST CDOs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 754,264 839,419  
VIE, Primary Beneficiary      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total Assets 3,872,784 2,940,513  
Total liabilities 3,030,539 2,235,665  
Redeemable non-controlling interest in Consolidated VIEs 53,361 66,392  
VIE, Primary Beneficiary | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 1,143,855 682,802  
VIE, Primary Beneficiary | Consolidated SLST CDOs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family CDOs, at fair value 754,264 839,419  
VIE, Primary Beneficiary | Financing And Other VIEs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 33,340 29,606  
Real estate, net held in Consolidated VIEs 1,451,053 927,725  
Other assets 156,182 110,871  
Total Assets 3,872,784 2,940,513  
Multi-family CDOs, at fair value 1,898,119 1,522,221  
Mortgages payable on real estate, net in Consolidated VIEs 1,083,371 672,568  
Other liabilities 49,049 40,876  
Total liabilities 3,030,539 2,235,665  
Redeemable non-controlling interest in Consolidated VIEs 53,361 66,392  
Non-controlling interest in consolidated variable interest entities 32,383 24,359  
Net investment 756,501 614,097  
VIE, Primary Beneficiary | Financing And Other VIEs | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 2,232,209 1,872,311  
VIE, Primary Beneficiary | Residential Loan Securitizations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 0  
Real estate, net held in Consolidated VIEs 0 0  
Other assets 87,833 36,767  
Total Assets 1,350,189 838,196  
Multi-family CDOs, at fair value 1,143,855 682,802  
Mortgages payable on real estate, net in Consolidated VIEs 0 0  
Other liabilities 32,432 20,156  
Total liabilities 1,176,287 702,958  
Redeemable non-controlling interest in Consolidated VIEs 0 0  
Non-controlling interest in consolidated variable interest entities 0 0  
Net investment 173,902 135,238  
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 1,262,356 801,429  
VIE, Primary Beneficiary | Consolidated SLST      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 0  
Real estate, net held in Consolidated VIEs 0 0  
Other assets 3,437 3,547  
Total Assets 973,290 1,074,429  
Multi-family CDOs, at fair value 754,264 839,419  
Mortgages payable on real estate, net in Consolidated VIEs 0 0  
Other liabilities 3,482 3,193  
Total liabilities 757,746 842,612  
Redeemable non-controlling interest in Consolidated VIEs 0 0  
Non-controlling interest in consolidated variable interest entities 0 0  
Net investment 215,544 231,817  
VIE, Primary Beneficiary | Consolidated SLST | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value 969,853 1,070,882  
VIE, Primary Beneficiary | Consolidated Real Estate      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 33,340 29,606  
Real estate, net held in Consolidated VIEs 1,451,053 927,725  
Other assets 64,912 70,557  
Total Assets 1,549,305 1,027,888  
Multi-family CDOs, at fair value 0 0  
Mortgages payable on real estate, net in Consolidated VIEs 1,083,371 672,568  
Other liabilities 13,135 17,527  
Total liabilities 1,096,506 690,095  
Redeemable non-controlling interest in Consolidated VIEs 53,361 66,392  
Non-controlling interest in consolidated variable interest entities 32,383 24,359  
Net investment 367,055 247,042  
VIE, Primary Beneficiary | Consolidated Real Estate | Residential loans      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential loans, at fair value $ 0 $ 0  
[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 March 31, 2022 and December 31, 2021, assets of consolidated VIEs totaled $3,872,784 and $2,940,513, respectively, and the liabilities of consolidated VIEs totaled $3,030,539 and $2,235,665, respectively. See Note 7 for further discussion.