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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Assets and Liabilities of Consolidated VIEs (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
Sep. 30, 2017
Dec. 31, 2017
USD ($)
securitization
Dec. 31, 2016
USD ($)
securitization
Dec. 31, 2015
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cash and cash equivalents     $ 95,191 $ 83,554 $ 61,959
Multi-family loans held in securitization trusts, at fair value     9,657,421 6,939,844  
Real estate held for sale in consolidated variable interest entities     64,202 0  
Receivables and other assets     117,822 138,323  
Total Assets [1]     12,056,285 8,951,631  
Securitized debt     81,537 158,867  
Mortgages and notes payable in consolidated variable interest entities     57,124 1,588  
Accrued expenses and other liabilities     82,126 64,381  
Total liabilities [1]     11,080,284 8,100,469  
Repayments of secured debt     79,433 126,018 116,136
Collateralized Loan Obligation          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Repayments of secured debt $ 55,900   137,160 136,314 85,966
Residential collateralized debt obligations          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential and multi-family collateralized debt obligations     70,308 91,663  
Repayments of secured debt     21,442 25,152 $ 28,952
Multi-family collateralized debt obligations, at fair value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential and multi-family collateralized debt obligations     9,189,459 6,624,896  
Residential mortgage loans held in securitization trusts, net          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential mortgage loans     73,820 95,144  
Financing VIEs, Multi-family CMBS Re-securitization          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Investment securities available for sale, at fair value held in securitization trusts     47,922 43,897  
Receivables and other assets     4,333 4,420  
Total Assets     1,209,981 1,245,152  
Securitized debt     29,164 28,332  
Accrued expenses and other liabilities     4,316 4,400  
Total liabilities     1,127,524 1,169,734  
Financing VIEs, Multi-family CMBS Re-securitization | Multi-family collateralized debt obligations, at fair value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential and multi-family collateralized debt obligations     1,094,044 $ 1,137,002  
Financing VIEs, Multi-family CMBS Re-securitization | K-Series          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number of securitizations | securitization       2  
Number of consolidated securitizations | securitization       1  
Financing VIEs, 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       $ 0  
Financing VIEs, 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     1,157,726 $ 1,196,835  
Financing VIEs, Collateralized Recourse Financing | K-Series | Collateralized Loan Obligation          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number of securitizations | securitization       3  
Financing VIEs, Residential Mortgage Loan Securitization          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Receivables and other assets     935 $ 912  
Total Assets     74,755 96,056  
Accrued expenses and other liabilities     24 20  
Total liabilities     70,332 91,683  
Financing VIEs, Residential Mortgage Loan Securitization | Residential collateralized debt obligations          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential and multi-family collateralized debt obligations     70,308 91,663  
Financing VIEs, 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     73,820 95,144  
Financing VIEs, Distressed Residential Mortgage Loan Securitization          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Receivables and other assets     15,428 13,610  
Total Assets     137,219 208,957  
Securitized debt     52,373 130,535  
Accrued expenses and other liabilities     2,957 1,336  
Total liabilities     55,330 131,871  
Financing VIEs, 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       0  
Financing VIEs, 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     121,791 195,347  
Other VIEs, Multi-family CMBS          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Receivables and other assets     29,301 19,753  
Total Assets     8,528,996 5,762,762  
Accrued expenses and other liabilities     28,969 19,753  
Total liabilities     8,124,384 5,507,647  
Other VIEs, Multi-family CMBS | Multi-family collateralized debt obligations, at fair value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential and multi-family collateralized debt obligations     8,095,415 5,487,894  
Other VIEs, Multi-family CMBS | Residential mortgage loans held in securitization trusts, net          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential mortgage loans       0  
Other VIEs, 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     8,499,695 5,743,009  
Other VIEs          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cash and cash equivalents     808 186  
Real estate held for sale in consolidated variable interest entities     64,202    
Receivables and other assets     25,507 17,759  
Total Assets     90,517 17,945  
Mortgages and notes payable in consolidated variable interest entities     57,124 1,588  
Accrued expenses and other liabilities     1,727 13  
Total liabilities     58,851 1,601  
Financing And Other VIEs          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cash and cash equivalents     808 186  
Investment securities available for sale, at fair value held in securitization trusts     47,922 43,897  
Multi-family loans held in securitization trusts, at fair value       6,939,844  
Real estate held for sale in consolidated variable interest entities     64,202    
Receivables and other assets     75,504 56,454  
Total Assets     10,041,468 7,330,872  
Securitized debt     81,537 158,867  
Mortgages and notes payable in consolidated variable interest entities     57,124 1,588  
Accrued expenses and other liabilities     37,993 25,522  
Total liabilities     9,436,421 6,902,536  
Financing And Other VIEs | Residential collateralized debt obligations          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential and multi-family collateralized debt obligations     70,308 91,663  
Financing And Other VIEs | Multi-family collateralized debt obligations, at fair value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential and multi-family collateralized debt obligations     9,189,459 6,624,896  
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     73,820 95,144  
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     121,791 $ 195,347  
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     $ 9,657,421    
Non-Financing VIEs, Multi-Family CMBS | K-Series          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number of securitizations considered non-financing VIEs | securitization     6 4  
Class A Notes | Collateralized Mortgage Obligations          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Transfer of financial assets accounted for as sale, initial fair value of assets obtained as proceeds     $ 177,500    
Available-for-sale securities, debt securities, ownership percentage   5.00%   5.00%  
[1] Our 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 December 31, 2017 and December 31, 2016, assets of consolidated VIEs totaled $10,041,468 and $7,330,872, respectively, and the liabilities of consolidated VIEs totaled $9,436,421 and $6,902,536, respectively. See Note 10 for further discussion.