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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Assets and Liabilities of Consolidated VIEs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
securitization
Mar. 31, 2019
USD ($)
securitization
Mar. 31, 2018
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 103,724 $ 65,359 $ 65,495
Multi-family loans held in securitization trusts, at fair value 11,679,847 14,328,336  
Real estate held for sale in consolidated variable interest entities 29,704 0  
Receivables and other assets 114,821 132,135  
Total Assets [1] 14,737,638 17,555,141  
Securitized debt 42,335 0  
Mortgages and notes payable in consolidated variable interest entities 31,227 3,986  
Accrued expenses and other liabilities 101,228 125,955  
Total Liabilities [1] 13,557,345 16,175,689  
Collateralized Mortgage Obligations | Class A Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Proceeds from issuance of secured debt $ 177,500    
Percentage of ownership 5.00%    
Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations $ 53,040 49,247  
Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 11,022,248 13,547,195  
Multi-family CMBS Re-securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities available for sale 52,700    
Receivables and other assets 4,243    
Total Assets 1,164,014    
Securitized debt 30,121    
Accrued expenses and other liabilities 4,228    
Total Liabilities 1,070,953    
Multi-family CMBS Re-securitization | Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 1,036,604    
Multi-family CMBS Re-securitization | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans held in securitization trusts, net 0    
Multi-family CMBS Re-securitization | 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 1,107,071    
Distressed Residential Mortgage Loan Securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables and other assets 10,287    
Total Assets 98,383    
Securitized debt 12,214    
Accrued expenses and other liabilities 444    
Total Liabilities 12,658    
Distressed Residential Mortgage Loan Securitization | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans held in securitization trusts, net 0    
Distressed Residential Mortgage Loan Securitization | Distressed residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans held in securitization trusts, net 88,096    
Residential Mortgage Loan Securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables and other assets 1,061 1,203  
Total Assets 57,856 54,072  
Accrued expenses and other liabilities 26 24  
Total Liabilities 53,066 49,271  
Residential Mortgage Loan Securitization | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 53,040 49,247  
Residential Mortgage Loan Securitization | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans held in securitization trusts, net 56,795 52,869  
Multi-family CMBS      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables and other assets 37,679 47,186  
Total Assets 10,610,455 14,375,522  
Accrued expenses and other liabilities 37,022 46,154  
Total Liabilities 10,022,666 13,593,349  
Multi-family CMBS | Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 9,985,644 13,547,195  
Multi-family CMBS | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans held in securitization trusts, net 0    
Multi-family CMBS | 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 10,572,776 14,328,336  
Other      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 708 712  
Real estate held for sale in consolidated variable interest entities 29,704    
Receivables and other assets 23,254 20,225  
Total Assets 53,666 20,937  
Mortgages and notes payable in consolidated variable interest entities 31,227 3,986  
Accrued expenses and other liabilities 1,166 439  
Total Liabilities 32,393 4,425  
Financing And Other VIEs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 708 712  
Investment securities available for sale 52,700    
Real estate held for sale in consolidated variable interest entities 29,704    
Receivables and other assets 76,524 68,614  
Total Assets 11,984,374 14,450,531  
Securitized debt 42,335    
Mortgages and notes payable in consolidated variable interest entities 31,227 3,986  
Accrued expenses and other liabilities 42,886 46,617  
Total Liabilities 11,191,736 13,647,045  
Financing And Other VIEs | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateralized debt obligations 53,040 49,247  
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 11,022,248 13,547,195  
Financing And Other VIEs | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans held in securitization trusts, net 56,795 52,869  
Financing And Other VIEs | Distressed residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans held in securitization trusts, net 88,096    
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 $ 11,679,847 $ 14,328,336  
Multi-family collateralized mortgage backed securities | K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of securitizations | securitization 2    
Number of consolidated securitizations | securitization 1    
Non-Financings, Multi-Family CMBS | K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of securitizations, non-financing VIE's | securitization 8 11  
[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, 2019 and December 31, 2018, assets of consolidated VIEs totaled $14,450,531 and $11,984,374, respectively, and the liabilities of consolidated VIEs totaled $13,647,045 and $11,191,736, respectively. See Note 9 for further discussion.