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Use of Special Purpose Entities and Variable Interest Entities - Assets and Liabilities of Consolidated VIEs (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) securitization | Sep. 30, 2017 USD ($) securitization | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) securitization
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 101,904 | $ 101,904 |  | $ 83,554
Investment securities available for sale |  |  | 674,161 | 674,161 |  | 818,976
Multi-family loans held in securitization trusts, at fair value |  |  | 8,399,334 | 8,399,334 |  | 6,939,844
Real estate held for sale in consolidated variable interest entities |  |  | 64,097 | 64,097 |  | 0
Receivables and other assets |  |  | 123,944 | 123,944 |  | 138,323
Total Assets | [1] |  | 10,264,922 | 10,264,922 |  | 8,951,631
Securitized debt |  |  | 98,371 | 98,371 |  | 158,867
Mortgages and notes payable in consolidated variable interest entities |  |  | 57,342 | 57,342 |  | 1,588
Accrued expenses and other liabilities |  |  | 71,394 | 71,394 |  | 64,381
Total Liabilities | [1] |  | 9,418,917 | 9,418,917 |  | 8,100,469
Repayments of secured debt |  |  |  | 62,098 | $ 53,354 |
Collateralized Mortgage Obligations | Class A Notes |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Proceeds from issuance of secured debt |  |  | $ 177,500 | 177,500 |  | $ 177,500
Available-for-sale securities, debt securities, ownership percentage |  |  | 5.00% |  |  | 5.00%
Residential collateralized debt obligations |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Collateralized debt obligations |  |  | $ 76,867 | 76,867 |  | $ 91,663
Repayments of secured debt |  |  |  | 14,856 | 20,736 |
Multi-family collateralized debt obligations, at fair value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Collateralized debt obligations |  |  | 7,990,619 | 7,990,619 |  | 6,624,896
Collateralized Loan Obligation |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Repayments of secured debt |  | $ 55,900 |  | 104,958 | $ 91,901 |
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) |  |  | 79,875 | 79,875 |  | 95,144
Multi-family CMBS Re-securitization |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Investment securities available for sale |  |  | 46,623 | 46,623 |  | 43,897
Receivables and other assets |  |  | 4,217 | 4,217 |  | 4,420
Total Assets |  |  | 1,225,181 | 1,225,181 |  | 1,245,152
Securitized debt |  |  | 28,946 | 28,946 |  | 28,332
Accrued expenses and other liabilities |  |  | 4,200 | 4,200 |  | 4,400
Total Liabilities |  |  | 1,145,797 | 1,145,797 |  | 1,169,734
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 |  |  | 1,112,651 | 1,112,651 |  | 1,137,002
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 |  |  | 1,174,341 | 1,174,341 |  | 1,196,835
Distressed Residential Mortgage Loan Securitizations |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Receivables and other assets |  |  | 19,795 | 19,795 |  | 13,610
Total Assets |  |  | 153,767 | 153,767 |  | 208,957
Securitized debt |  |  | 69,425 | 69,425 |  | 130,535
Accrued expenses and other liabilities |  |  | 1,766 | 1,766 |  | 1,336
Total Liabilities |  |  | 71,191 | 71,191 |  | 131,871
Distressed Residential Mortgage Loan Securitizations | Distressed residential mortgage loans held in securitization trust (net) |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Residential mortgage loans held in securitization trusts (net) |  |  | 133,972 | 133,972 |  | 195,347
Residential Mortgage Loan Securitization |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Receivables and other assets |  |  | 1,585 | 1,585 |  | 912
Total Assets |  |  | 81,460 | 81,460 |  | 96,056
Accrued expenses and other liabilities |  |  | 22 | 22 |  | 20
Total Liabilities |  |  | 76,889 | 76,889 |  | 91,683
Residential Mortgage Loan Securitization | Residential collateralized debt obligations |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Collateralized debt obligations |  |  | 76,867 | 76,867 |  | 91,663
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) |  |  | 79,875 | 79,875 |  | 95,144
Multi-family CMBS |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Receivables and other assets |  |  | 23,959 | 23,959 |  | 19,753
Total Assets |  |  | 7,248,952 | 7,248,952 |  | 5,762,762
Accrued expenses and other liabilities |  |  | 23,733 | 23,733 |  | 19,753
Total Liabilities |  |  | 6,901,701 | 6,901,701 |  | 5,507,647
Multi-family CMBS | Multi-family collateralized debt obligations, at fair value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Collateralized debt obligations |  |  | 6,877,968 | 6,877,968 |  | 5,487,894
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 |  |  | 7,224,993 | 7,224,993 |  | 5,743,009
Other |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  | 1,194 | 1,194 |  | 186
Real estate held for sale in consolidated variable interest entities |  |  | 64,097 | 64,097 |  |
Receivables and other assets |  |  | 24,701 | 24,701 |  | 17,759
Total Assets |  |  | 89,992 | 89,992 |  | 17,945
Mortgages and notes payable in consolidated variable interest entities |  |  | 57,342 | 57,342 |  | 1,588
Accrued expenses and other liabilities |  |  | 2,621 | 2,621 |  | 13
Total Liabilities |  |  | 59,963 | 59,963 |  | 1,601
Financing and Non-Financing VIEs |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  | 1,194 | 1,194 |  | 186
Investment securities available for sale |  |  | 46,623 | 46,623 |  | 43,897
Real estate held for sale in consolidated variable interest entities |  |  | 64,097 | 64,097 |  |
Receivables and other assets |  |  | 74,257 | 74,257 |  | 56,454
Total Assets |  |  | 8,799,352 | 8,799,352 |  | 7,330,872
Securitized debt |  |  | 98,371 | 98,371 |  | 158,867
Mortgages and notes payable in consolidated variable interest entities |  |  | 57,342 | 57,342 |  | 1,588
Accrued expenses and other liabilities |  |  | 32,342 | 32,342 |  | 25,522
Total Liabilities |  |  | 8,255,541 | 8,255,541 |  | 6,902,536
Financing and Non-Financing VIEs | Residential collateralized debt obligations |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Collateralized debt obligations |  |  | 76,867 | 76,867 |  | 91,663
Financing and Non-Financing VIEs | Multi-family collateralized debt obligations, at fair value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Collateralized debt obligations |  |  | 7,990,619 | 7,990,619 |  | 6,624,896
Financing and Non-Financing 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) |  |  | 79,875 | 79,875 |  | 95,144
Financing and Non-Financing VIEs | Distressed residential mortgage loans held in securitization trust (net) |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Residential mortgage loans held in securitization trusts (net) |  |  | 133,972 | 133,972 |  | 195,347
Financing and Non-Financing 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 |  |  | $ 8,399,334 | $ 8,399,334 |  | $ 6,939,844
Multi-family collateralized mortgage backed securities | K-Series |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Number of securitizations | securitization |  |  | 2 | 2 |  | 2
Number of consolidated securitizations | securitization |  |  | 1 | 1 |  | 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 |  |  | 5 | 5 |  | 4
Collateralized Recourse Financing | Collateralized Loan Obligation | K-Series |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Number of securitizations | securitization |  |  |  |  |  | 3
[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, 2017 and December 31, 2016, assets of consolidated VIEs totaled $8,799,352 and $7,330,872, respectively, and the liabilities of consolidated VIEs totaled $8,255,541 and $6,902,536, respectively. See Note 10 for further discussion.

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